Comments on: Gristleizer

By: Jules

Jules — Wed, 07 Dec 2011 03:47:04 +0000

I’ve completed my Gristleizer Kit from EA, but It will not power up. I’m a novice builder, wondering where I’m most likely to make a mistake in this build.

I’m sure it’s something simple, where are faults most likely to occur?

thanks very much! I enjoyed this build!

-J

By: bob

bob — Sat, 19 Feb 2011 18:19:12 +0000

Just built this one on vero (based on the layout in the project PDF, but with the bias and level trimmers taken offboard and a few other tweaks). Works fairly well, but there is noticable oscillator ticking bleeding through to the audio. Roy (Mr. Gwinn, I presume) above says that the integrator cap is a likely suspect, pardon my ignorance, but which cap is that? My wiring could be a bit tidier, so I’ll tackle that first.

There’s not a massive difference between the 4 waveforms (it is possible to tell which is which, but it is subtle, especially at higher speeds), not sure if that’s as it should be. Also there is a big loss of mid and lower freqs in filter mode, making it sound pretty shrill and unpleasant. VCA mode sounds much better in this regard, with a guitar signal sounding nicely rounded. Would be good to hear from someone else who’s had a go on vero (I can’t be doing with those nasty etching chemicals – RoHS vero rules!).

BTW – would be nice if Gus were to update the project PDF with the corrected DP4W switch wiring. Took me quite a while to debug.

With a bit more work, I can see this being pretty great – so a big thanks to Roy Gwinn for designing and sharing this, and to Gus for promoting it to us DIYers.

By: jacob

jacob — Sun, 06 Feb 2011 18:08:32 +0000

thank you.

By: Pdr

Pdr — Fri, 04 Feb 2011 20:55:19 +0000

I believe you can replace the two nine volts using this: http://gaussmarkov.net/wordpress/circuits/bipolar-9v-power-supply/

By: Jacob

Jacob — Sun, 02 Jan 2011 16:23:12 +0000

How do i replace the two nine volts with a nine volt power adapter?

By: jean bender

jean bender — Wed, 29 Dec 2010 21:53:53 +0000

Hi !
I’ve just built my kit from smashing guitar, but it seems that i have the same problems as Gigel Margel who wrote here.
Well, could somebody give me a link to the aron forum which talk about the gristleizer ? I can’t find it anywhere…
thanks for the help !

By: Anonymous

Anonymous — Mon, 15 Nov 2010 20:46:13 +0000

Sammie,
I wouldn’t bother just yet. It doesn’t perform. There is a fundamental issue with the circuit somewhere. I will be working on it soon to sort it out. Been busy this last few months. Somebody on this site knows what it is, but isn’t saying.
john.

By: sammie

sammie — Mon, 04 Oct 2010 21:51:01 +0000

hello there i am very interested in building one for myself, but don’t have the means to print a board. could anyone help me with this. I am In the UK just for reference.

many thanks

By: Dino T

Dino T — Fri, 01 Oct 2010 13:50:33 +0000

I’m an electronics newbie (though I’m trying). What are the voltage values for the capacitors? Other than the can caps, do they have to be box or chicklets, or can they be axial (like a pregnant resistor)?

Thanks.

By: JohnS

JohnS — Tue, 11 May 2010 09:38:46 +0000

Changed my mind about the orientation of the FET also. My book says one way but the web says the reverse (several times). Have gone back to position in layout. Have now got waveforms on all 741 outputs so nearly there.