electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
Live streaming at radio.electro-music.com

  host / artist show at your time
  EdisonRex Edison's Electronic Review
Please visit the chat
 Forum index » DIY Hardware and Software » The layout factory
Dual-wave LFO Vero layout
Post new topic   Reply to topic
Page 1 of 1 [17 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
kxspxr



Joined: Nov 20, 2008
Posts: 35
Location: Denmark

PostPosted: Mon Nov 24, 2008 4:25 am    Post subject: Dual-wave LFO Vero layout
Subject description: Super-simple dual-wave LFO from http://experimentalistsanonymous.com
Reply with quote  Mark this post and the followings unread

I made a vero layout from Colin's Super-simple dual LFO:
http://experimentalistsanonymous.com/diy/Schematics/Oscillators%20LFOs%20and%20Signal%20Generators/Simple%20Dual%20LFO.gif

Just finished soldering it. Works like a charm Smile


LFO.png
 Description:
 Filesize:  33.32 KB
 Viewed:  10613 Time(s)

LFO.png



_________________
"Posthumanity is a discrete set of processes with arbitrary return codes."
Back to top
View user's profile Send private message
Ojd



Joined: Feb 22, 2008
Posts: 65
Location: Ua
Audio files: 1

PostPosted: Thu May 03, 2012 3:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

It works!
How to get bigger output voltage?
apart from adding another opamp?
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Mon Nov 24, 2014 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

The 68K resistor is close to 1/2 of 100K, this is limiting the output voltage swing. This resistor must be less than the 100K feedback resistor. Try increasing the 68K by adding other resistors in series, 27K might be a good place to start (68K + 27K = 95K). If it stops oscillating, then it's too large. I don't know what precision level your resistors are, but you should know that just because are resistor says "100K" doesn't mean it's exactly 100K, it could be a little more or a little less. Another way to maximize the output swing would be to put a pot (say, 50K) in series with the 68K (wiper and one side). Then increase it until it stops oscillating then back if off until it starts to oscillate again. Remove the pot and measure with an ohm meter. Then find a suitable fixed resistor to put in place of the pot. Make sure that the fixed resistor is less than or exactly equal to the pot value. You should verify this using the ohm meter.
_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Baloo



Joined: Jul 09, 2013
Posts: 16
Location: France

PostPosted: Wed Feb 04, 2015 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Would work for 12v instead 9v?
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Thu Feb 05, 2015 4:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Power supply voltage should not matter as long as it is less than the maximum specification in the datasheet for the opamp.
_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Snaper



Joined: Feb 28, 2014
Posts: 184
Location: Hungary

PostPosted: Thu Feb 05, 2015 6:39 am    Post subject: Reply with quote  Mark this post and the followings unread

How big is the output? (vpp)
I could imagine tons of these in my Eurorack...
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Thu Feb 05, 2015 7:21 am    Post subject: Reply with quote  Mark this post and the followings unread

The PSU voltage is 1.3333 times larger, so a good estimate would be 1.3333 times the output swing of the 9 volt version.

Best way to know is make one on a breadboard and measure it.

_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Mon Dec 07, 2015 8:25 am    Post subject:
Subject description: Dual-wave LFO Vero layout
Reply with quote  Mark this post and the followings unread

(Again resurrecting a thread - but I think that is a good thing really Cool )

Thanks Jovian Pyx for referring this great layout and for all the information.

I am just wondering why there is no connection for -V

Do I just wire up +V and ground with no -V?

A couple of these will be so useful

Very Happy
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Mon Dec 07, 2015 8:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, referring to the schematic, I see a single rail (+9v) and ground. However, he creates an "internal" virtual ground that he calls "Vb", so the opamp can work properly. So this circuit needs only one positive rail and no negative rail.
_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Mon Dec 07, 2015 8:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi JovianPyx

Thanks for the reply - I think I should try to find the schematic for this - is it at experimentalist anon? Have started to understand schematics (as long as they are not too complicated) which I find really exciting.

Thanks again for your explanation of the range am looking at building a dual version of this and will try the measuring advice you gave.

Cool
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Mon Dec 07, 2015 8:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Isn't the schematic the link in the opening post?
_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Mon Dec 07, 2015 4:40 pm    Post subject: Sockets for component flexibility Reply with quote  Mark this post and the followings unread

Yes it is thank you Jovianpyx! Embarassed

On the advice of someone on Muff's I broke up some single row header and soldered the 'sockets' where the resistor legs go. The idea is to be able to experiment with the resistor values - great idea but how to get the resistors not to fall out?

Not sure the connection is reliable either.

What didn't I get Confused

Last edited by Ayab on Mon Dec 07, 2015 5:10 pm; edited 1 time in total
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Mon Dec 07, 2015 5:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Heh - I "see" what you're doing - it sounds like the resistor wires are very thin like for most 1/8 watt, so they aren't thick enough to make a proper "force fit". You can use resistors with thicker wires. Or you can solder a small piece of thicker wire to each end. Test the wire first, if it fits and doesn't fall out - that's a good size.

My Opinion --> When I do DIY electronics, I start things on a breadboard so I can mess around with things like resistor and cap values. Once I get it working the way I want/like, I either use that as a pattern to make one with stripboard (because it's easy to find stripboard that's laid out like breadboard), or I transfer the parts one at a time from breadboard to stripboard. Breadboards have spring contacts, so a good variety of wire sizes will connect, so you can use parts with almost whatever size wires. Breadboards also allow you to basically circuit bend any way you want. You can start out with one or more basic circuits and connect them however you want. You can probably find most of what you need schematic-wise and even layouts and PCB art right here on electro-music.com

_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Mon Dec 07, 2015 5:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Smart idea will try soldering stronger wire on. Also my stripboard is a bit crappy and it is pushing out the track.

I agree with you that I should bread board first but have been learning this game from buying a couple of kits and then bare pcb's from here on Electro-Music.com ( Wink ). Thought I would try and tackle some stripboard projects to help add functionality to my system.

You must be right that some general electronics knowledge (breadboarding) is a good idea.

I have been hoping this is more a jigsaw puzzle than anything else - maybe that is a bit ambitious!

Hope things are good with you and thanks for the assistance.
Back to top
View user's profile Send private message
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Mon Dec 07, 2015 5:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Been trying the socketing but is a bit fiddly. Maybe putting a variable resistor makes more sense. So if I put a small variable resistor (20k) in series with the 68k that should adjust the range?
Back to top
View user's profile Send private message
JovianPyx



Joined: Nov 20, 2007
Posts: 1354
Location: West Red Spot, Jupiter
Audio files: 171

PostPosted: Mon Dec 07, 2015 6:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, that would adjust the amplitude of the output.
_________________
FPGA, dsPIC and Fatman Synth Stuff

Time flies like a banana.
Fruit flies when you're having fun.
BTW, Do these genes make my ass look fat?
corruptio optimi pessima
Back to top
View user's profile Send private message Visit poster's website
Ayab



Joined: Oct 27, 2015
Posts: 41
Location: London, UK

PostPosted: Tue Dec 08, 2015 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks again JovianPyx - you have been really helpful.

Would the attached pic be along the right lines?

Good luck with your projects Cool


Simple LFO amplitude Mod.jpg
 Description:
 Filesize:  100.93 KB
 Viewed:  1854 Time(s)

Simple LFO amplitude Mod.jpg


Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic
Page 1 of 1 [17 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » The layout factory
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use