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PHOBoS DIY Synth schematics
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Thu Mar 31, 2016 7:05 am    Post subject: Re: PHOBoS DIY Synth schematics
Subject description: circuit pr0n!
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All I know is that it is a 400mW zenerdiode, I don't have a serial number or anything but that shouldn't really matter.
The original circuit by Nicolas has V/Hz tracking but I don't know if that is still true with the modifications I made,
and no there isn't any calibration.

I see you are pretty new to this DIY stuff and personally I wouldn't recommend this VCO. It works but it's range is rather
limited (I originally made it to use in a drone synth) and a triangle output is pretty boring.

A sawtooth wave is more interesting and can easily be converted to triangle or square and a sinewave isn't very hard to do either.
So I would suggest to have a look at this thread and this one. And maybe the one posted here could be worth a try too.

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jurekprzezdziecki



Joined: Mar 22, 2016
Posts: 68
Location: warsaw

PostPosted: Thu Mar 31, 2016 7:15 am    Post subject: Re: PHOBoS DIY Synth schematics
Subject description: circuit pr0n!
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PHOBoS wrote:
All I know is that it is a 400mW zenerdiode, I don't have a serial number or anything but that shouldn't really matter.
The original circuit by Nicolas has V/Hz tracking but I don't know if that is still true with the modifications I made,
and no there isn't any calibration.

I see you are pretty new to this DIY stuff and personally I wouldn't recommend this VCO. It works but it's range is rather
limited (I originally made it to use in a drone synth) and a triangle output is pretty boring.

A sawtooth wave is more interesting and can easily be converted to triangle or square and a sinewave isn't very hard to do either.
So I would suggest to have a look at this thread and this one. And maybe the one posted here could be worth a try too.


thanks a lot for your suggestions. i will look for those designs.
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mikemoretti



Joined: Apr 29, 2014
Posts: 5
Location: Boston, USA

PostPosted: Wed Jan 11, 2017 8:14 pm    Post subject: VCF resonance voltage is high Reply with quote  Mark this post and the followings unread

I breadboarded the VCF here and whenever you turn up the resonance, the voltage doesn't stick to the +/-5v range but goes to -5 to +10v. Any ideas why this would happen or how to fix it?

Thanks!
-m
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Sat Jan 14, 2017 9:32 am    Post subject: Re: VCF resonance voltage is high Reply with quote  Mark this post and the followings unread

Although it is not unusual for a filter to have a higher output voltage when the resonance is turned up there shouldn't be any offset.
At least not when a symmetrical waveform is used. I did some tests with my own filter and with a triangle wave the output voltage
pretty much stays within the -5..+5V range, with a squarewave there are peaks that go beyond that but nothing asymmetrical.

I'm not sure if it has anything to do with it but did you use green LEDs and connect them the correct way around ? Also, what kind
of input signal are you using ?

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mikemoretti



Joined: Apr 29, 2014
Posts: 5
Location: Boston, USA

PostPosted: Sat Jan 14, 2017 3:20 pm    Post subject: It was the LEDs Reply with quote  Mark this post and the followings unread

I hadn't added the leds. I didn't think they matter, but I guess their ~3v voltage drop across them is actually important. Now, it's down to about +/-7v with resonance all the way up and doesn't have any DC shift. I tried it out on saw and triangle. This is great! Thanks!
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
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PostPosted: Sun Jan 15, 2017 5:46 am    Post subject: Reply with quote  Mark this post and the followings unread

that's great to hear Very Happy
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SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube
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J-chot



Joined: Jan 20, 2014
Posts: 44
Location: Decatur AL

PostPosted: Sun Sep 23, 2018 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

where the hell did you get a 9v2 zener Diode?... is that supposed to be 9v1?
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PHOBoS



Joined: Jan 14, 2010
Posts: 5591
Location: Moon Base
Audio files: 705

PostPosted: Sun Sep 23, 2018 12:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Embarassed I believe you are correct, or maybe it was a 8V2. The value isn't critical though as the actual voltage can be adjusted.
Just don't make it too high because than it doesn' t work anymore.

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SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube
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J-chot



Joined: Jan 20, 2014
Posts: 44
Location: Decatur AL

PostPosted: Mon Sep 24, 2018 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Embarassed I believe you are correct, or maybe it was a 8V2. The value isn't critical though as the actual voltage can be adjusted.
Just don't make it too high because than it doesn' t work anymore.


thank you so much, because I was really thrown for a loop there for a sec, lol.
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