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 Forum index » DIY Hardware and Software
"Gristleizer" questions
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Appliancide*



Joined: Jul 04, 2007
Posts: 119
Location: Paul lives in Thief River Falls

PostPosted: Fri Mar 06, 2009 1:38 pm    Post subject: "Gristleizer" questions Reply with quote  Mark this post and the followings unread

http://rubidium.dyndns.org/cag/pdf/gep.pdf

So I have this on the breadboard right now and it's not quite 100% operational. There is a TON of line noise and the effect of the lfo is very subtle.

For the simplicity's sake I left off TR3, R25 and S3.

I substituted 1n60s, a 2n3906 and a mpf102 instead of the specified semis. Would any of these cause problems?
Also, I don't have a 2pole 4way switch so I just wired the square wave up for testing the circuit.

Any advice/thoughts would be much appreciated.

Thanks,
Paul

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ickystay



Joined: Nov 15, 2006
Posts: 139
Location: Oregon

PostPosted: Fri Mar 06, 2009 10:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can't see the diode or transistor you used being any problem. I don't know about the FET. I used an NTE133 (MPF103 replacement) in the first one I built, then got some proper 2N3819's.

The bias can really change the tone and amount of the effect. Have you twiddled with it much?

Other than maybe some LFO bleedthrough, this should not be a noisy effect.
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Appliancide*



Joined: Jul 04, 2007
Posts: 119
Location: Paul lives in Thief River Falls

PostPosted: Sat Mar 07, 2009 3:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I adjusted all of the pots to see what difference it would make. The bias definitely changed the sound as did the level pot. When the level is turned down, the noise basically takes over the sound. Could this be coming from the power supply? I've used it to power a couple of other simple audio circuits without this problem.

I'm not at home for a few days, but I am going to double check my wiring for mistakes.

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faulty



Joined: Jun 25, 2008
Posts: 5
Location: Brooklyn

PostPosted: Tue Jul 28, 2009 4:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just built this circuit myself. What I was wondering is if anyone could tell me how to increase the range of the LFO making able to go slower? Would increasing the value the value of C1 do it. I'm afraid I'm still pretty stupid when it comes to theory of how a lot of electronics work. It's coming slowly, and I'm afraid of frying the circuit because I etched a PCB and it is completely assembled.
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frequencycentral



Joined: May 25, 2008
Posts: 186
Location: UK

PostPosted: Wed Jul 29, 2009 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

The Gristleizer actually had the bias pot panel mounted as a full size pot as opposed to a trimpot, presumably for more tweakability: http://boingboing.net/2008/12/27/throbbing-gristles-g.html#previouspost
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screwloose



Joined: Feb 14, 2012
Posts: 2
Location: Texas

PostPosted: Wed Mar 06, 2013 12:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

So I just put together the endangered audio gristleizer and only the ramp up and reverse ramp works fine. The triangle and square waveforms don't do anything other than bypass. Anyone have any ideas?

http://endangeredaudioresearch.com/wp-content/uploads/2012/02/TGagandum.pdf

Scheme at bottom.
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