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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
CMOS Pulsewidth Modulators
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synthmonger



Joined: Nov 16, 2006
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PostPosted: Mon Apr 27, 2009 10:36 pm    Post subject: CMOS Pulsewidth Modulators
Subject description: two channel. CV/signal processor
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The 71k resistor on pin 1 of the 4007 may need to be adjusted on different power supplies. Otherwise, should work fine as is!


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DGTom



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PostPosted: Tue Apr 28, 2009 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool! I have your 40106 VCO on my breadboard at the moment, would this be best used straight off the output pin or from one or other of the "proper" waveform outs?
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synthmonger



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PostPosted: Tue Apr 28, 2009 5:02 am    Post subject: Reply with quote  Mark this post and the followings unread

If you're using the VCO with the 4016 switch that is acting as a voltage controlled variable resistor on one of the spare 40106 gates yes it would work. Triggers are the only thing this can't handle. Anything else, normal square, triangle, sine, saw etc will work. Negative voltages too.
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synthmonger



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PostPosted: Tue Apr 28, 2009 6:23 am    Post subject: Reply with quote  Mark this post and the followings unread

For an audio clip you can refer to my Pulse Monger which uses similar circuitry. I used transistors instead of MOS for it but it sounds exactly the same.

http://www.youtube.com/watch?v=_TksWPbagsM


More to come soon!

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synthmonger



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PostPosted: Tue Apr 28, 2009 8:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Board layout is done. I have 6 boards with pnp on them and ready to etch. After I etch and dirll them I'm going to keep two and put the other 4 in my Etsy store.


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PostPosted: Wed Apr 29, 2009 4:01 am    Post subject: Reply with quote  Mark this post and the followings unread

I've been playing around with your 'super simple vco' with a transistor for the CV in, cos I blew my only (for the time being) 4007 up Embarassed w/ the 4007 I used the current source drawing (I think) slacker posted up here, that worked great.

Gonna search for the info on the 4016 idea now Very Happy

So these are really intended as standalone PWM everything! Nice.
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monokinetic



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PostPosted: Wed Apr 29, 2009 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey synthie!

Hmmm, sounds intriguing Smile I had a quick look at the PCB and schematic (Bananas are indeed delish!). But I'm not 100 percent sure I understand what you have here:

It seems to be 2x PWM oscillators, CV controllable. Is that correct?

I think there are 6 pots on the PCB, but only 4 on the schematic (or is the trim on the front panel?).

Sorry if these are obvious questions, I'm just double-checking before I head over to your etsy store, assuming this is what I think it is Wink

David
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synthmonger



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PostPosted: Wed Apr 29, 2009 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

monokinetic wrote:
Hey synthie!

Hmmm, sounds intriguing Smile I had a quick look at the PCB and schematic (Bananas are indeed delish!). But I'm not 100 percent sure I understand what you have here:

It seems to be 2x PWM oscillators, CV controllable. Is that correct?

I think there are 6 pots on the PCB, but only 4 on the schematic (or is the trim on the front panel?).

Sorry if these are obvious questions, I'm just double-checking before I head over to your etsy store, assuming this is what I think it is Wink

David


It's not two PW oscillators but two circuits that take any input waveform (guitars, toys, and the like will need amplification) and outputs a 0 to +5v square wave whose duty cycle is variable via CV. There are only Two pots, one for each pulse width, of course you could add more for PWMOD and each output. I use 3.5mm switching jacks from all electronics and I have added mounting places for them on the pcb.


I etched the boards but was too tired to drill them. They'll be available later tonight or tomorrow after I make sure they're good to go.

Edit: two panel mounted pots and two trim offset pots. One for each PWM.

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PostPosted: Thu Apr 30, 2009 3:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I added 4 PWM boards to my site. Here's the link!

http://www.etsy.com/view_listing.php?listing_id=24383500

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