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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
drone machine with adapted soundlab circuits
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Mon Jul 18, 2011 11:57 pm    Post subject: drone machine with adapted soundlab circuits Reply with quote  Mark this post and the followings unread

I'm building a cmos based drone machine with an adapted version of the soundlab mini synth filter.
It's basically 2 Oscillators with Pulsewidh control and 1 LFO + pseudo Attack-Release Envelope control build with a CD40106 chip. Nothing fancy so far.

But since I figured out, that it's easy to drive the SL-minisynth filter with only a single 9-volt batterie by building a virtuell ground, I had to include an adapted circuit.
It sounds DOPE now!! Fat bass and chorus like sounds + a sine-like wave when the resonance pot is turned all the way clockwards. The filter is gated by the AR-LFO from the CD40106 and sounds even better than the one from my original soundlab.

The next step would be to include the white noise source from the SL-minisynth.
But first I need some help:

My volume pot sounds grinding while I am turning it. But when the volume is fixed it's gone. Only while I am turning it it makes this noise. Also when I twist the switch, which selects between BP and LP Filter output. Though I think the switch shorts BP and LP and this could be the problem.

I didnt use a decoupling capacitor on the output of the circuit, because it seems that it would filter the sound again. No matter which value I tried.
May this be the problem?
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inlifeindeath



Joined: Apr 02, 2010
Posts: 316
Location: Albuquerque, NM

PostPosted: Tue Jul 19, 2011 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread

sounds like you have DC across the pot
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Tue Jul 19, 2011 9:44 am    Post subject: Reply with quote  Mark this post and the followings unread

DC across the volume pot. hmh.....that's not good.
So a nonpolarized capacitor should help. But it filters the output signal with every value that I tried so far.
I'm gonna make some trial 'n' error before I break my head.

thanks
I'll let you know if I figure out something new.
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synthesist



Joined: Feb 17, 2011
Posts: 79
Location: austria
Audio files: 2

PostPosted: Tue Jul 19, 2011 12:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

yes! I got it.
The capacitor value that I tried to use for decoupling was actually o.k.
It wasnt filtering the output sound, but the sound gets distorted easier. So I needed a 47k resistor. Now the capacitors dont affect the output anymore and the volume pot doesnt grind anymore.
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