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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
the absolute beginners thread
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tjookum



Joined: May 25, 2010
Posts: 353
Location: Netherlands
Audio files: 26

PostPosted: Mon Jun 07, 2010 7:00 am    Post subject: the absolute beginners thread
Subject description: follow my journey into lunetta-land
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Because this community rocks and the people have been so helpfull I can't help to do something back. This thread is for posting my progress as an absolute beginner into the world of lunetta's, for beginner info I suggest starting here: http://electro-music.com/forum/topic-40243.html Im hoping that by showing other beginners my progress I can inspire them to build their own.

First, a little background info:
I am a fine arts student with a background in mechanics and a passion for music and tinkering. After messing around with computers and midi stuff I decided It's time to make my own sounds. I've done some circuitbending and built the Weird Sound Generator by ray wilson, link:http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/WSG_Reborn/WEIRDSOUNDGENERATORREBORN.php perfect for beginners.

After a lot of searching and the usual lurking in the shadows of the forum I discovered this thing they call lunetta's. Looked around, loved it and ordered my first set of cmos IC's and other small parts. I want to avoid using expensive frontplate parts and decided I want to build a modular lunetta using droffset/electri-fire's perfboard design: http://electro-music.com/forum/topic-30479-150.html, and it just looks really cool Cool .

I built my first module yesterday. It's a quad oscilator using a 40106 based on the attached pdf, really basic but absolutely neccesary for further experiments. I found it really usefull to breadboard the whole thing first and double check everything before making the final perfboard version. Learning how to breadboard a schematic is a must have skill for lunetta building, start out easy and you'll get the hang of it in notime. I've attached a top and bottom view of the module. I know my solderingskills are a little shabby, but I hope it's usefull to others to see how the connections are layed out.

Today I messed around with a r2r ladder and a tl074 op-amp, copying the other part of the quadosc schematic, see attachment. It worked real nice, but im going to try some other mixer/amp combinations to see wich works best. Suggestions about this are very welcome because im getting a little confused with all the different op-amp schematics.

up next:
-4040 and 4051 modules
-4051/4017 melody generator
-4011 ringmod
-finishing the mixer and amp.

plans for the future:
-WSG filter
-(ab)using my arduino microcontroller
-making it look pretty Laughing


p.s.: English is not my native language so im sorry of some stuff is hard to read.


HPIM1607.JPG
 Description:
40106 quad osc. topview
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40106 quad osc. bottomview
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breadboard 7-6-2010
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quadosclunetta_213.pdf
 Description:
quad osc lunetta schematic by inventor. thread can be found here: http://electro-music.com/forum/topic-38163.html&postorder=asc&highlight=quadosc+lunetta&start=25

Download
 Filename:  quadosclunetta_213.pdf
 Filesize:  18.9 KB
 Downloaded:  524 Time(s)


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adambee7



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PostPosted: Mon Jun 07, 2010 12:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm not a newbie but i am when it comes to lunettas. I've opened up a you tube chanel of my exploits. Stuff will be added as regular as possible. Fun isn't it. Very Happy Very Happy

http://www.youtube.com/user/TheAdambee7#g/u
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Rykhaard



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PostPosted: Mon Jun 07, 2010 2:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tjookum - your soldering looks absolutely fine for early in your experiences! It's nice and clean and most of your solder points have a nice shine to them! It's hard to be neat and tidy sometimes on perfboard. In those regards - great job!

I AM minorly envious of the 3 of you, using the hookup format that you all are. I still do prefer banana jacks / plugs, but ... so little space is required for your method. Surprised Smile

Also - I would absutively (modified word, by myself Wink ) LOVE to find out WHERE you got those breadboard patching wires! I am down-right-tootin'-n-all in LOVE with those patch wires! Where did they come from? I MUST get some! Surprised
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Ajax



Joined: Apr 05, 2010
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PostPosted: Mon Jun 07, 2010 4:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Rykhaard wrote:
]Also - I would absutively (modified word, by myself Wink ) LOVE to find out WHERE you got those breadboard patching wires! I am down-right-tootin'-n-all in LOVE with those patch wires! Where did they come from? I MUST get some! Surprised


SECONDED.

Also, I'm a beginner too, so I'll try and post some of my exploits as well.
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acidblue



Joined: Jun 26, 2009
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PostPosted: Mon Jun 07, 2010 4:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Those jumper wires are pretty good.
I got mine here:
http://www.makershed.com/ProductDetails.asp?ProductCode=MKSEEED3
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RF



Joined: Mar 23, 2007
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PostPosted: Mon Jun 07, 2010 5:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tjookum -
Nice soldering! Nothing to be worried about there - or for that matter, your language skills...nearly perfect!

Great idea to run this thread - have a blast - these things are way fun.

bruce

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Uncle Krunkus
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PostPosted: Tue Jun 08, 2010 2:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Rykhaard wrote:
I am down-right-tootin'-n-all in LOVE with those patch wires! Where did they come from? I MUST get some! Surprised


I agree Rykh,
They look so perfect!
Hard and pointy on the ends, and soft and flexible in the middle!! (Just like a nice baked potatoe!!) Very Happy

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tjookum



Joined: May 25, 2010
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Location: Netherlands
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PostPosted: Tue Jun 08, 2010 10:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I'm not a newbie but i am when it comes to lunettas. I've opened up a you tube chanel of my exploits. Stuff will be added as regular as possible. Fun isn't it. Very Happy Very Happy

http://www.youtube.com/user/TheAdambee7#g/u

very cool Adambee, that's the dirtiest sound I've heard in some time! I see you use ramp and saw waves, might have to look into that. Any suggestions on where to start?

Quote:
I agree Rykh,
They look so perfect!
Hard and pointy on the ends, and soft and flexible in the middle!! (Just like a nice baked potatoe!!) Very Happy

hehe, yeah they work just fine. I got them when I was experimenting with the arduino wich uses the same female headers. My breadboard is still small and so are my experiments, but im going to need a lot more wires when the module is finished. A slimmer version could be very usefull cause they tend to bend when there are too many in a row.

ok, made some progress today, im glad I have some spare time cause the learning and building combined eats up a lot of time. Im using euro-size 100x160mm perfboards and I considder the first one as a prototype to test stuff and see how it works. I painted the perfboard using a marker and it worked really well. I tried paint earlier but that just cloggs up the holes. I first tried a couple of cheap colourmarkers but found out that the only way to get some real coverage was to use one of those thick graffiti markers. Im interested to see how I can use this to improve functionaility as well as looks.

I also got the first chip on the board, a simple and very usefull 4040 divider. I used the Echuck schematics electri-fire posted here: http://electro-music.com/forum/topic-38634.html. Although the 4040 is easily understood from just the datasheet. I tried some different layouts by just hanging the parts in the perfboard to see wich works best. I would like to make it as easy as possible to use, not just by me but also some musically gifted friends. I ended up with using exactly the same design as droffset, I hope it's not considdered stealing but it was so well thought out that I couldn't find any better way of doing it.

Im still looking for some simple single supply modules to make on my experimental board, suggestions are very welcome...

And ofcourse the manditory picture cascade:


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 Description:
marker test
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adambee7



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PostPosted: Tue Jun 08, 2010 11:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice perf work man. Top job. Like the way this going to look. Did you use a black marker pen for the topside of board.

The dirt sound comes from putting upto 8volts into the gate of the Envelope/VCA. Usually 0 to 5v is gate signal but this has given it the buzz saw sound. Especially if you raise the attack and have release nearly full up. The whole setup runs on 9v so i can push the lm358 a bit harder. I have eq'ed the output to add more bass but the distortion is still there. Very Happy Very Happy
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Rykhaard



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PostPosted: Tue Jun 08, 2010 1:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

The black marker on the perfboard looks absolutely stunning! Shocked Very Happy
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electri-fire



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PostPosted: Tue Jun 08, 2010 3:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

tjookum wrote:
I ended up with using exactly the same design as droffset, I hope it's not considdered stealing but it was so well thought out that I couldn't find any better way of doing it. /.../

I used the Echuck schematics electri-fire posted./.../

Im still looking for some simple single supply modules to make on my experimental board, suggestions are very welcome...


Not stealing, making well use of material posted for the exact purpose of helping and inspiring fellow EM members/visitors. As a matter of fact, you've already made useful contributions yourself. I'm almost through my little E-chuck boards, and so is Inventor. They've proven their value as a means to make small well defined modules that (having a limited (single) function) are easy to make and debug. But now I think I will direct my strategy toward making somewhat larger modules. A perfect example would be the four oscillator module with pots included that you posted. It's a very concise little layout. I have a couple of those PCB pots you used, very recommendable for on circuitboard Lunetta's. They are pcb trim pots, consisting of two parts, a trimpot with a "screwdriver slot" and a separate "knobhandle" that can be inserted into it. Cheap, pretty sturdy and user freindly, small "footprint". (I should insert a link here later)

tjookum wrote:
Im still looking for some simple single supply modules to make on my experimental board, suggestions are very welcome...


You havn't mentioned using shift registers yet. I have a 4021, but on hindsight I think I'd recommend 4015 first. And erm.. I've been rereading old posts at this forum and found too numerous great suggestions to mention here. There's already a vast amount of knowledge gathered here. Thanks all for your contributions.
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adambee7



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PostPosted: Tue Jun 08, 2010 3:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey we all share here. We all give each other ideas that's what makes this the best forum around. Keep doing what your doing because looks like your a natural. Very Happy Very Happy
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Ajax



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PostPosted: Tue Jun 08, 2010 8:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

I made some pretty good progress on an incredibly simple mixer. I'm currently in a country where my mixer isn't, but once we're reunited I'll do a little walkthrough here. After all, mixing and outputs are half the battle!
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droffset



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PostPosted: Tue Jun 08, 2010 9:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

NOT stealing, all of the info is free. Smile I'm happy you think it might be useful.

This is a great thread!
Your soldering looks WAY better than mine did when I started. Smile

adambee7: I'll check out the Youtube Channel. I love youtube.

Ajax: I never realized that I needed a mixer until I built one.

As you guys come up with your own ideas and solutions, if you'd like to add some stuff to the document please let me know. I'm currently too hectic to do much work to it.

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Check out the FREE Intro to Lunettas Document
https://docs.google.com/Doc?docid=0AZIwOP-PR9sSZDlidzgzbV8wY3RjenJqanY&hl=en

Edit: Spelling mistakes.
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tjookum



Joined: May 25, 2010
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Location: Netherlands
Audio files: 26

PostPosted: Wed Jun 09, 2010 7:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Nice perf work man. Top job. Like the way this going to look. Did you use a black marker pen for the topside of board.

The dirt sound comes from putting upto 8volts into the gate of the Envelope/VCA. Usually 0 to 5v is gate signal but this has given it the buzz saw sound. Especially if you raise the attack and have release nearly full up. The whole setup runs on 9v so i can push the lm358 a bit harder. I have eq'ed the output to add more bass but the distortion is still there. Very Happy Very Happy

Thanks, although anything in macro setting and nice light always looks really impressive to me Very Happy. I used one of those graffiti markers, but anything wich can lay down a solid layer will work, might try some monoprints in the future.

Thanks for explaining where the dirt comes from Smile. I think I need to do some research on envelope filters first cause it isn't making much sense to me right now. How did you build your output module? Can't seem to decide on a good single supply design for mine.


Quote:
Not stealing, making well use of material posted for the exact purpose of helping and inspiring fellow EM members/visitors. As a matter of fact, you've already made useful contributions yourself. I'm almost through my little E-chuck boards, and so is Inventor. They've proven their value as a means to make small well defined modules that (having a limited (single) function) are easy to make and debug. But now I think I will direct my strategy toward making somewhat larger modules. A perfect example would be the four oscillator module with pots included that you posted. It's a very concise little layout. I have a couple of those PCB pots you used, very recommendable for on circuitboard Lunetta's. They are pcb trim pots, consisting of two parts, a trimpot with a "screwdriver slot" and a separate "knobhandle" that can be inserted into it. Cheap, pretty sturdy and user freindly, small "footprint". (I should insert a link here later)

Once again, my lay-out was mostly inspired by droffset but Im curious to see how yours turns out. I don't think I got the best range out of them so messing with the values might be a good idea.
Yeah those little trimpots are great, I got mine here: http://www.dickbest.nl/webshop/forums.html?act=viewProd&productId=702(dutch dealer). For 35 ct a piece it's a bargain. Im not sure if it's the squarewave nature or the pots themselve but I am getting a very logaritmic response. It makes for fiddly adjusting so I might have to change them. Is there a easy way to tell if they are linear or logaritmic?

Quote:
You havn't mentioned using shift registers yet. I have a 4021, but on hindsight I think I'd recommend 4015 first. And erm.. I've been rereading old posts at this forum and found too numerous great suggestions to mention here. There's already a vast amount of knowledge gathered here. Thanks all for your contributions.


Checked out a few and got all excited so went to the shop and got myself 3 4015 and also 2 4018. This will keep me busy for some hours, thanks!


Quote:
I made some pretty good progress on an incredibly simple mixer. I'm currently in a country where my mixer isn't, but once we're reunited I'll do a little walkthrough here. After all, mixing and outputs are half the battle!


very true indeed. I got a gazilion sounds from my 3 little chips already, so no shortage on that. Soundquality is a different story, I would love to experiment some more with mixers, filters, amps and effects. I for one will be waiting for your walkthrough.

Quote:
NOT stealing, all of the info is free. Smile I'm happy you think it might be useful.


Usefull? I am a visual kind of person and by just seeing your module I learned a lot! Laughing I tried making mine a little different but yours are just to well engineered to change anything about.


Back to to today's experiments and build. I found out that I forgot to add the bypass cap and didn't connect the groundlines on opposite side of the 4040, Surprised . This kind of stuff happens all the time, I guess my brain thinks it's good fun to mess with me sometimes. I also added the 4051 wich I already "dry-boarded"(the placing of components in the holes so as one does not forget) last night. Using the arduino as a 5v supply I flipped the switch and behold, it was spitting out some very cool sounds! I used the quad osc. for the clock signals and gated 2 osc. together with a led(thanks electri-fire!). The led's are also blinking away nicely, I can definately recommend using those. I posted 2 clips on my youtube channel: http://www.youtube.com/user/JvGrieken

Im still struggeling to get the powersupply working as it should. The arduino has 5v and 3v3 outs, does this mean I can use the 3v3 as a dual supply? I know an arduino is overkill in a lunetta but since I have it I might as well use it. Im also running into some problems routing all the different +v and ground connections underneath. How do I place the bypass cap when I use one +v and ground connection for the entire board? How did you tackle this droffset?

And some more pictures, yay!


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the entire current setup
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gating LED power! amazing what just one LED can do
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adambee7



Joined: Apr 04, 2009
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PostPosted: Wed Jun 09, 2010 12:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thats sick man. That is coming along fast more vids please. Very Happy Very Happy
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tjookum



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PostPosted: Thu Jun 10, 2010 11:47 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks adambee. Ill try to post some more vids later when I finish some more modules.

@ryk: If you dont mind I would like to reply to your comment on youtube here.

Quote:
For such an early construction, this is just phenomenal! A great grungy sound as well! From overdrive into the camera's mic, or is it naturally like that out of the boards? Looking way forward to more as you continue learning! Very Happy


Thanks for the kind words Very Happy Very Happy . I didn't use any overdrive or any filter/mixer, I recorded it using the camera mic wich sounds pretty much the same as real life. I used 5v arduino supply, a 3€ usb amp, the quadosc, 1 4040 and 1 4051.
That's what I love about lunetta's, there is no "wrong". I literally just plug anything into everything and the leds start flashing and the sound pumping.

There is a lot of information on the forum already and some of it looks quite daunting. I think it's important to lunetta newcomers to know that it really is as easy as pumping out some squarewaves and using a couple of cmos chips and a amp to make a lunetta sound machine.

Next up will be the 4015 shift register, I'll probably breadboard and "dryboard" it first cause I've never used one.

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Rykhaard



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PostPosted: Thu Jun 10, 2010 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

tjookum wrote:
thanks adambee. Ill try to post some more vids later when I finish some more modules.

@ryk: If you dont mind I would like to reply to your comment on youtube here.


No troubles chief! Smile

Quote:
Quote:
For such an early construction, this is just phenomenal! A great grungy sound as well! From overdrive into the camera's mic, or is it naturally like that out of the boards? Looking way forward to more as you continue learning! Very Happy


Thanks for the kind words Very Happy Very Happy . I didn't use any overdrive or any filter/mixer, I recorded it using the camera mic wich sounds pretty much the same as real life. I used 5v arduino supply, a 3€ usb amp, the quadosc, 1 4040 and 1 4051.


Whu'! Excellent sound! Just wonderful distored RAW! Twisted Evil

Quote:

That's what I love about lunetta's, there is no "wrong". I literally just plug anything into everything and the leds start flashing and the sound pumping.


Exactly! Very Happy Fun for the whole family! Very Happy Laughing

Quote:

There is a lot of information on the forum already and some of it looks quite daunting. I think it's important to lunetta newcomers to know that it really is as easy as pumping out some squarewaves and using a couple of cmos chips and a amp to make a lunetta sound machine.

Next up will be the 4015 shift register, I'll probably breadboard and "dryboard" it first cause I've never used one.


For the Shift Registers, if you're not using their individual outputs for driving other things and would like to see / hear some action, build yourself an R-2R Digital to Analog Converter (DAC). Then, pump the DAC's output into a VCO. The more inputs that you have, the greater the variety of (cough cough) 'melodies' that you'll get out of it.
A Shift Register (with 8 bits) into an R-2R, running along side a 4017 / 4051 Synthmonger Melody Generator? Just terror! Very Happy Love it. Twisted Evil

Oooo. Find videos from Bruce (RFeng). Some of the most amazing stuff has come out of his machines.
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tjookum



Joined: May 25, 2010
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PostPosted: Sat Jun 12, 2010 7:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I got the 4015 in yesterday, I really wanted a more symmetrical lay-out so I wired pin 1 and 2 to output 9 and 10 and vice versa. It's a usefull addition to the board and the leds make really cool patterns too Very Happy .

Quote:
For the Shift Registers, if you're not using their individual outputs for driving other things and would like to see / hear some action, build yourself an R-2R Digital to Analog Converter (DAC). Then, pump the DAC's output into a VCO. The more inputs that you have, the greater the variety of (cough cough) 'melodies' that you'll get out of it.


Thanks again! I breadboarded the r2r and also a synthmonger triangle VCO, after some tinkering I got it working and I got some cool melody's. The sound is not really what im looking for(I like things raw, dirty and less predicatable Wink ), but I can see the potential. I've added a vid to my channel: http://www.youtube.com/watch?v=JkSj4drJdkQ
Im planning on using the vco mod for my wsg so I might get some more fun out of this setup.

Im still confused about the use of bypass caps, at the moment I don't use them for the 4051 and 4015 and they seem to work normal.
On the wsg I just put all the bypasscaps next to the power and ground supply, I remember someone saying that it's good enough for these simple circuits and it works just fine.

Power is also something im struggeling with. Im planning on building a seperate board for the mixer and other op-amp related stuff powered by a 2x9v bipolar supply. Can I connect the ground of the 2 boards together and still have the cmos board on single(5-15v) supply?

Also tried a 4011 ringmod today, at 5v it didn't work at all and at 9v it would only spit out some fragmented sound at high frequency's. Anyone have a good schematic for this?

Ic's waiting for a purpose in their life:
4017
4024
4093
4011
4018

p.s.: It says I've reached my maximum upload (20mb) already, any good reliable way of getting more pictures up?

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There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson
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Last edited by tjookum on Sun Jun 13, 2010 8:48 am; edited 1 time in total
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tjookum



Joined: May 25, 2010
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PostPosted: Sat Jun 12, 2010 10:18 am    Post subject: Reply with quote  Mark this post and the followings unread

12-06-2010 Lunetta Terror by user2101008

got a soundcloud account going and already the first recording, some good old noisy terror Smile

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electri-fire



Joined: Jul 26, 2006
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PostPosted: Sat Jun 12, 2010 10:58 am    Post subject: Reply with quote  Mark this post and the followings unread

tjookum wrote:
Im still confused about the use of bypass caps, at the moment I don't use them for the 4051 and 4015 and they seem to work normal.On the wsg I just put all the bypasscaps next to the power and ground supply, I remember someone saying that it's good enough for these simple circuits and it works just fine.


The bypass caps are of special importance at you basic oscillator chips where you have your timing capacitors and resistors. In a lot of Lunetta's this means at your 40106 IC's. Voltage drops or oscillations on the powerline directly affect these. I "think" this is less of an issue with IC's that just take in external clocks, like your 4051 and 4015's.
Putting multiple bypass caps near the main power sort of defeats the purpose. Might as well just have one bigger electrolitic there. The small (usually 0.1uF) caps want to go as close to the IC as possible.

tjookum wrote:
Power is also something im struggeling with. Im planning on building a seperate board for the mixer and other op-amp related stuff powered by a 2x9v bipolar supply. Can I connect the ground of the 2 boards together and still have the cmos board on single(5-15v) supply?


That should work. Some opamps are "said" to need bipolar supply, but there's a way to eliminate the need for bipolar supply on opamps. What you do is put half the supply voltage on the other (opposing) input of the opamp. Example: if your sound goes into the + input of the opamp and you run your board on 9V, put 4.5V on the - input of your opamp. Now the -V can be 0V or Ground.

Half the supply voltage can be made with a voltage devider, two equal resistors in series between +V and ground. On the junction of the resistors half the supply voltage is availabe.
Question: I've seen resistors used in schematics as low as 220 ohm used, but more often higher ones like 220K's (that's what I used). I presume low value resistors increase battery drain. Is this of practical significance? Is there a limit to how high one should use? Any "generic" recommendations?


tjookum wrote:
Also tried a 4011 ringmod today, at 5v it didn't work at all and at 9v it would only spit out some fragmented sound at high frequency's. Anyone have a good schematic for this?


Hrmpff, that should not be the case. I think you should either troubleshoot your connections, or use all stabilizing techniques like bypass caps and pullup/down resistors.

tjookum wrote:
It says I've reached my maximum upload (20mb) already, any good reliable way of getting more pictures up?


Ask the moderator to increase your upload limit. Erm... moderator, please? I'd like to see more "tjookum" stuff.
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electri-fire



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PostPosted: Sat Jun 12, 2010 11:25 am    Post subject: Reply with quote  Mark this post and the followings unread

electri-fire wrote:
Half the supply voltage can be made with a voltage devider, two equal resistors in series between +V and ground. On the junction of the resistors half the supply voltage is availabe.


Here's an example of running a TL084 on a single supply voltage. The VR (reference voltage) of 4.5V is made with two 100k resistors (lower right corner of the schematic). Also note the use of the capacitor used there. It is not always used. I've seen other value caps in schem's too, value seems not to be too critical. Small values like Pete used filter out oscillations on the powerline, larger ones help stabilize the voltage. I don't have a cap there, and it works.

http://casperelectronics.com/images/finishedpieces/droner/Drone%20Lab%20single%20schematics-2.jpg
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tjookum



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PostPosted: Sun Jun 13, 2010 8:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
The bypass caps are of special importance at you basic oscillator chips where you have your timing capacitors and resistors. In a lot of Lunetta's this means at your 40106 IC's. Voltage drops or oscillations on the powerline directly affect these. I "think" this is less of an issue with IC's that just take in external clocks, like your 4051 and 4015's.
Putting multiple bypass caps near the main power sort of defeats the purpose. Might as well just have one bigger electrolitic there. The small (usually 0.1uF) caps want to go as close to the IC as possible.


aha! This made it all totally clear for me, thanks! Im going to use some leggs under the perfboard so i can squeeze some in on the underside if i need them.



Quote:
Here's an example of running a TL084 on a single supply voltage. The VR (reference voltage) of 4.5V is made with two 100k resistors (lower right corner of the schematic). Also note the use of the capacitor used there. It is not always used. I've seen other value caps in schem's too, value seems not to be too critical. Small values like Pete used filter out oscillations on the powerline, larger ones help stabilize the voltage. I don't have a cap there, and it works.

http://casperelectronics.com/images/finishedpieces/droner/Drone%20Lab%20single%20schematics-2.jpg


I think I saw one of those dronelabs somewhere before, good stuff. Seeing the schematic made it totally clear to me, thanks. Smile I happen to have a TL084 I just bought so I think Ill make good use of it and try the lowpass, fuzz and maybe even the bandpass filter. Do you have any samples of the sounds yours makes?

Did some tweaking of the knobs yesterday and got a pretty cool sound going. I think it's mostly the 4015 delaying the song but im not really sure(and im happy with that Very Happy ).
13-05-2010 Angry Nintendo by Tropical Benny

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There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
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Rykhaard



Joined: Sep 02, 2007
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PostPosted: Sun Jun 13, 2010 8:57 am    Post subject: Reply with quote  Mark this post and the followings unread

tjookum wrote:
Did some tweaking of the knobs yesterday and got a pretty cool sound going. I think it's mostly the 4015 delaying the song but im not really sure(and im happy with that Very Happy ).


That sounded just great! Almost from the start though, I kept expecting some poor person to say "Hello? Heeeelloooooooooo? What's wrong with this phone? Why wont it answer whoever's calling? Hello???" Laughing
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electri-fire



Joined: Jul 26, 2006
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PostPosted: Mon Jun 14, 2010 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

tjookum wrote:
(on the Dronelab): Do you have any samples of the sounds yours makes?


I didn't build one, I came across the link in another recent thread, and used the schematic to illustrate the use of applying VR (= 0.5 +V) to the oposit opamp input for opamps that normally need bipolar power.
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