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[New] 2VL1 Dual 40106 VCO + LFO 12HP Euro DIY
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author [New] 2VL1 Dual 40106 VCO + LFO 12HP Euro DIY
devinw1
You can always use another VCO right!? Why not 2 of them and an LFO in 1 12HP module?

I got the idea for this after designing and breadboarding a VCO with the venerable CD40106 and it ended up working quite nice, so I figured I'd try and use all 6 units on the 40106 in one module. I ended up using 5, so a good try I reckon!

Features:
-2 Independent VCOs (Saw/Tri/Pulse on 1 and Saw/Pulse on the other)
-1 Free running LFO (Tri and Square)
-2nd VCO can be synced to 1st OR external sync
-Very good tuning (<+/-4cents over 7(+) octaves)
-Very good temp stability (THAT320 + Tempco, though you can omit and use your own transistors and skip the Tempco)
-Triple thru-hole board stack - easy to build.
-No rare parts

Detailed Info:
MAIN PAGE
SPECS / BUILD DOCUMENTATION
BOM
SOUND SAMPLES

Here's what it looks like with a prototype FPE panel, but you will get a (nicer) laser engraved panel:




Here's the laser engraved panel:


And here are the 3 boards and panel:



--------

Currently not offering Panels/PCBs but I am working with a couple of vendors to offer those sets and possibly full kits. I will post on this thread with any updates.
ixtern
Very nice VCO and the price is reasonable.

But...I have some doubts regarding design:
- why pnp THAT320? pnp are always worse than npn and the choice is less
(for npn I can choose from THAT300, MAT14, LM394, AS394);
- why slow CMOS gate as comparator?
- why to use buffers from LM13700? If LM13700 is used without buffers, it can be replaced without any changes by LM13600, NE5517 (rare) or very cheap AK317DC (always nice to have wider choice). Maybe in this case buffers from 13600 (and others) may be used but it needs careful analysis I cannot make.

P.S. I am always in need of another VCO smile
MapacheRaper
Cool sandwhich of waves
devinw1
Thanks, and I will try to answer your questions smile

1) PNPs for the Expo is simply because that section I used mostly from the classic EN129 Expo generator. Also most of the NPN expo designs seem to be set up to be a current sink rather than source but the Iabc pin on a LM13700 wants a current source so the dual PNP design is ready to rock.

2) I'm using the 40106 because it's super cheap and simple. Plus, I looked around and saw a lot of people making simple drone oscs out of it but no real VCOs so I wanted to try. It actually works quite well and left some open units to use as buffers and part of the sync circuit. In other words, why not? Mr. Green seriously, i just don't get it

3) Point taken. I actually don't use the LM13700 on the VCO B (syncable) channel. If I do a version 2 of this I'll just dump the buffers on VCO A and make it more flexable for OTA choice. In the meantime LM13700s are still plentiful and cheap, so hopefully not too much of a worry!
devinw1
MapacheRaper wrote:
Cool sandwhich of waves


Thanks! I loves me a good FR4 sammich! hihi
basicbasic
That documentation is SlayerBadger!
devinw1
basicbasic wrote:
That documentation is SlayerBadger!


Thank you!! I tried to up my game on that since the last project! It's peanut butter jelly time!
Low-Gain
https://modularaddict.com/wpa-2vl1osc-pcp

It's peanut butter jelly time! It's peanut butter jelly time! It's peanut butter jelly time!
jonny_w
Beauty! This is an auto-purchase for me, based on the INCREDIBLE quality of your Pro-One kit smile

Is there an issue with the BOM link? I can't seem to access it right now.
devinw1
jonny_w wrote:
Beauty! This is an auto-purchase for me, based on the INCREDIBLE quality of your Pro-One kit smile

Is there an issue with the BOM link? I can't seem to access it right now.


Woot! Thanks MA for getting that up so quick!

As for the BOM, it is working for me... Weird! Try to save the link and download the file, maybe it is an issue with your browser trying to open an Excel file?
jonny_w
devinw1 wrote:
jonny_w wrote:
Beauty! This is an auto-purchase for me, based on the INCREDIBLE quality of your Pro-One kit smile

Is there an issue with the BOM link? I can't seem to access it right now.


Woot! Thanks MA for getting that up so quick!

As for the BOM, it is working for me... Weird! Try to save the link and download the file, maybe it is an issue with your browser trying to open an Excel file?


It was indeed a browser quirk. Got it to work smile
devinw1
Oh good! thumbs up
mbizon
I love me some CMOS OSCs, and the demo sounded great!
I saw the MA pcb/panel but wondering if there are full kits selling anywhere?
devinw1
mbizon wrote:
I love me some CMOS OSCs, and the demo sounded great!
I saw the MA pcb/panel but wondering if there are full kits selling anywhere?


Not at this time but I will say the BOM is very complete and plug and play. You can get everything from Mouser and Tayda except the tempcos .
honeyb
devinw1 wrote:

Not at this time but I will say the BOM is very complete and plug and play. You can get everything from Mouser and Tayda except the tempcos .


Almost plug and play.. I'm wondering if the tempcos should be 3300ppm or 3500ppm?

Looking forward to building this, the kit looks awesome!
devinw1
honeyb wrote:
devinw1 wrote:

Not at this time but I will say the BOM is very complete and plug and play. You can get everything from Mouser and Tayda except the tempcos .


Almost plug and play.. I'm wondering if the tempcos should be 3300ppm or 3500ppm?

Looking forward to building this, the kit looks awesome!


Go with the 3300 Akenohms. I will get this added to the build doc/BOM soon too! Thanks!! Rockin' Banana!
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