Author |
Message |
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
|
Back to top
|
|
|
Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
|
Posted: Tue Nov 20, 2018 2:55 am Post subject:
|
|
|
Whats with this guy from lookmumnocomputer, he's sooo annoying
(this is a totally subjective observation...) _________________ my synth |
|
Back to top
|
|
|
LFLab
Joined: Dec 17, 2009 Posts: 497 Location: Rosmalen, Netherlands
|
Posted: Wed Nov 21, 2018 7:38 am Post subject:
|
|
|
That furby organ is pretty epic though |
|
Back to top
|
|
|
kaputtpanzer
Joined: Nov 02, 2009 Posts: 139 Location: Cologne
Audio files: 15
|
Posted: Wed Nov 21, 2018 3:33 pm Post subject:
|
|
|
Incredibly annoying, but obviously he has some good ideas for weird instruments. That is the reason I somehow enjoy his stuff, even if it makes me low key aggressive... |
|
Back to top
|
|
|
AlanP
Joined: Mar 11, 2014 Posts: 746 Location: New Zealand
Audio files: 41
|
Posted: Wed Nov 21, 2018 9:43 pm Post subject:
|
|
|
I dunno, I like Sam's energy, and can-do attitude.
I will admit that I like him in small doses, though
He's quite talented at what he does! |
|
Back to top
|
|
|
Grumble
Joined: Nov 23, 2015 Posts: 1294 Location: Netherlands
Audio files: 30
|
Posted: Sat Nov 24, 2018 7:23 am Post subject:
|
|
|
It's like he's high on something all the time... _________________ my synth |
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Tue Nov 27, 2018 12:42 pm Post subject:
|
|
|
He's high on life!
I love sam though. He's the energizer bunny of the diy synth world, but also mad scientist.
He's irreplaceable, his designs/tuts are life savers for beginners like me. |
|
Back to top
|
|
|
Zorn
Joined: Jul 15, 2014 Posts: 21 Location: Lafayette, LA
|
Posted: Wed Nov 28, 2018 9:04 am Post subject:
|
|
|
Grumble wrote: | It's like he's high on something all the time... |
Well He's definitely over-modulated !
Joking aside - thanks for posting this - I'm at the beginning of building modules based on the Alfa(CEM) IC series & this is perfect for getting up & running.
Also thinking a quick, fast VCLFO by changing the 1n timing cap to 10n based on the DigiSound 80-2&3 schematic. |
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Fri Nov 30, 2018 2:15 pm Post subject:
|
|
|
Please share that cem3320 Filter when you get a chance. I would love to add that to the list. More filters, MORE Better |
|
Back to top
|
|
|
Zorn
Joined: Jul 15, 2014 Posts: 21 Location: Lafayette, LA
|
Posted: Sat Dec 01, 2018 9:27 am Post subject:
|
|
|
Project_2501 wrote: | Please share that cem3320 Filter when you get a chance. I would love to add that to the list. More filters, MORE Better |
My first filter is going to be the state-variable VCF from Thomas Henry's reprint collection http://electro-music.com/forum/topic-68068.html
"Build a Voltage Controlled State Variable Filter" / pg. #148 < actual pdf page number
It uses the 3330 instead of the 3320 - includes a pcb layout which uses the readily available TL074 for a total of 2 chips
There are several projects in the Reprint Collection that use Alfa/CEM chips and are worth a look:
The PAL Filter (3320) / pg. #92 (phase shifter & LP filter)
VCAs: Think Simple (3330) / pg. #84 (dual VCA)
A One Chip ADSR (3310) / pg. #124 (actually 2 chips)
These are not quite as simple as Sam's VCO project (except for the ADSR-3310) - but for my core build I want to stay with the TH designs and the Alfa/CEM type chips.
*And there's a wealth of 3320 info at https://electricdruid.net/multimode-filters-part-1-reconfigurable-filters/ |
|
Back to top
|
|
|
Psalm37audio
Joined: Dec 23, 2018 Posts: 1 Location: UK
|
Posted: Sun Dec 23, 2018 11:27 am Post subject:
Re: CEM3340 VCO LMNC |
|
|
Project_2501 wrote: |
I'm testing this VCO this week. I'll post my build notes and recordings when I get there. |
I'm a total noob to electronics and this website. I can solder, follow instructions and buy components from a BOM. When it comes to knowing what needs a resistor and where to put it, I'm done for without clear visual direction.
So having a layout like LMNC has convinced me to build as it pretty clear.
However I would really like to get the pulse out probably by using a tl074 as an alternative, I think I can work that bit out okay
What I really want is a CV in for PWM, with a potentiometer for alternative PWM (will that require a trimpot? No idea) and if possible a fine tune.
So if your build involved all that lot then I'd love to see the layout.
I'm sure it's all very simple to someone that knows what they're looking at when faced with a schematic, but alas that isn't me. |
|
Back to top
|
|
|
Zorn
Joined: Jul 15, 2014 Posts: 21 Location: Lafayette, LA
|
Posted: Mon Dec 24, 2018 3:58 pm Post subject:
|
|
|
PAIA Electronics sold several different CEM experimenter boards for the CEM-3340, 3310, 3320 & 3330 series - the boards / kits are no longer available - but the documentation is.
Good info, calibration & basic schematic for the CEM-3340
https://www.paia.com/TALK/viewtopic.php?f=6&t=148&sid=be58eafb1e3bb89a4739dfc722e8c53d
Also use the link in my post (above) for the Thomas Henry reprint PDF & go to page 118 (actual page #) for information on modifying the EKx-40 schematic (including info on Pulse control) |
|
Back to top
|
|
|
J-chot
Joined: Jan 20, 2014 Posts: 44 Location: Decatur AL
|
Posted: Sun Dec 30, 2018 10:38 pm Post subject:
In regards to Sam's energy and persona... |
|
|
In regards to Sam's energy and persona, It bugged the hell out of me too, also I didn't get it... until I saw my 10 yr old watching some of his videos.....now I'm super appreciative.
Also the whole "WE HAVE TO BUILD IT NOW" attitude really appeals to the adhd side of my brain....
the yelling...not so much.... it makes me want to do a synth series and call it "the Joy of DIY Synthesis" and talk like Bob Ross the whole time.
hushed tones. |
|
Back to top
|
|
|
AlanP
Joined: Mar 11, 2014 Posts: 746 Location: New Zealand
Audio files: 41
|
Posted: Sun Dec 30, 2018 10:44 pm Post subject:
Re: In regards to Sam's energy and persona... |
|
|
J-chot wrote: | the yelling...not so much.... it makes me want to do a synth series and call it "the Joy of DIY Synthesis" and talk like Bob Ross the whole time. |
David Attenborough. He'd be the polar opposite of Sam.
I also like how Sam is kinda punk about the whole synth thing. |
|
Back to top
|
|
|
Thinredline
Joined: Sep 26, 2018 Posts: 3 Location: US
|
Posted: Sat Jan 12, 2019 8:56 pm Post subject:
|
|
|
Im totally agreeing with all of you guys on the Pro-Sam side. Hes pretty much one of the reasons of convincing me i can build this stuff. And i have, surprisingly well. Helped me understand a little bit more and i have zero background in eoectronics. psalm37audio and others, i suggest looking at other builds that use the 3340. Just make sure you pick one that has been proven to work. Found a schem for adding sine wave from some guys design but i didnt see where he said, "i think i made some mistakes but eh u figure it out..." I picked Thomas Henrys design and got sub/pulse, sine, pwm atten., Tons of other stuff pumping out of that lil chip. Its awesome!! LMK if u need help, i put it all on stripboard. |
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Tue Jan 15, 2019 6:22 pm Post subject:
|
|
|
Sorry for lagging everyone.
Procrastination from having to many projects is a real bitch sometimes.
I completed this module but haven't fired it up yet.
As soon as I get time, I'm going to fulling document the build to share. |
|
Back to top
|
|
|
kropo
Joined: Jan 29, 2019 Posts: 16 Location: Finland
|
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Thu Mar 07, 2019 1:54 pm Post subject:
|
|
|
I made this mod on my own but he added pwm cv in too with the pot wiring. I'm gonna make a bank of these VCO's when I get the chance. 3340's are cheap on ebay |
|
Back to top
|
|
|
Thinredline
Joined: Sep 26, 2018 Posts: 3 Location: US
|
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Fri Mar 22, 2019 9:45 am Post subject:
|
|
|
Grumble wrote: | Whats with this guy from lookmumnocomputer, he's sooo annoying
(this is a totally subjective observation...) |
Annoying or not, LMNC gets a lot of views for the subject matter I think. It's impressive for something as geeky and specialized as synth DIY; I wouldn't have thought it even possible. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Fri Mar 22, 2019 9:50 am Post subject:
Re: CEM3340 VCO LMNC |
|
|
I have been eyeing druid's SH101 design for a bit now. I always liked the way that VCO's in SH101 sounded.
Any ideas how to best derive -5, +14 etc from +/- 15V? I figured I could use a 7905 for the -5; tjat's easy, but not sure how to best get at 14V as It's low dropout from 15V.Voltage divider? How did Roland do this? _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Sat Sep 07, 2019 2:20 pm Post subject:
|
|
|
Mocking up this lovely VCO.
Debating to add yet an other TL072 for the Buffer ins for Hard/Soft Sync for Pin 6 & 9 on the 3340. Datasheet just has 1nf capacitors for the inputs for Hard/Soft sync. Should I bother with adding a TL072 or stay with the datasheet with the Capacitors?
After adding Hard/Soft sync to this VCO, it should be quite versatile VCO.
Ramp, Square, Triangle, Sine(going to add tri-sine), CV, PWM, Hard/Soft Sync.... Well thats is the goal at least. |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Sat Sep 07, 2019 4:42 pm Post subject:
|
|
|
Thinredline wrote: | This is not my original idea, this is based off of the maximus vco. |
The maximus has pretty much the same the same ramp to Sine circuit fragment TH uses for his 13700 VCO.
I have built this converter a few times now, I had to increase the gain of the final Op amp stage by about 6DB, but otherwise it works great. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
cslammy
Joined: Apr 27, 2018 Posts: 206 Location: USA
Audio files: 1
|
Posted: Sat Sep 07, 2019 4:44 pm Post subject:
|
|
|
Project_2501 wrote: | Mocking up this lovely VCO.
Debating to add yet an other TL072 for the Buffer ins for Hard/Soft Sync for Pin 6 & 9 on the 3340. Datasheet just has 1nf capacitors for the inputs for Hard/Soft sync. Should I bother with adding a TL072 or stay with the datasheet with the Capacitors?
After adding Hard/Soft sync to this VCO, it should be quite versatile VCO.
Ramp, Square, Triangle, Sine(going to add tri-sine), CV, PWM, Hard/Soft Sync.... Well thats is the goal at least. |
Project, I have a friend who has built at least 3 of the maximus VCOs. I will ask him if he buffered those pins or not. Also, I am done with the schemo and am in the process of laying out a 3340 VCO based closely on the maximus. Happy to share it when I'm done. _________________ Visit my AUDIODIWHY blog and website |
|
Back to top
|
|
|
Project_2501
Joined: Jan 31, 2018 Posts: 68 Location: Los Angeles
|
Posted: Sun Oct 13, 2019 1:30 pm Post subject:
|
|
|
Frequency Central PSU is alive!
LMNC update cem3340 layout isn't 100%.... My waveform outputs (Triangle, sawtooth, and ramp) are humming but my frequency pot isn't working. Tried adjusting the trim pot, no worky worky.....
Also, after firing it up, within minutes the ic's are hot to the touch! I'm going to cut an 2nd trace on the ic's(so I'll have 2 rows of cut stripboard hopefully curing any shorts that may be happening).
After I find the cure to the frequency knob, I'll try to use an lfo for the cv in see if that is functioning.
This is my first panel, after I get the thing humming nicely, I'll paint and post the pictures here.
If anyone has any input that will be amazing. I'm assuming the ic's are getting hot cause of a short somewhere. I did check my PSU is providing 12v/-12v. Hunt the continues! |
|
Back to top
|
|
|
|