Author Topic: Anybody build their Gristleizer yet, comments on it?  (Read 106903 times)

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Taylor

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Re: Anybody build their Gristleizer yet, comments on it?
« Reply #340 on: October 12, 2017, 10:00:07 PM »
BetterOffShred's suggestions sound good to me, but regarding your number 2, the "de-tick" cap on the board is connected to the LFO signal going to the FET transistor so that's different from power supply bypass caps.

I think it would be a good idea to put 100n caps from both the positive and negative power pins of the TL072 and TL074, going to ground. You want these caps to be as close as possible physically to the power pins, and with the leads trimmed as short as possible.

BetterOffShred

Re: Anybody build their Gristleizer yet, comments on it?
« Reply #341 on: October 12, 2017, 10:14:42 PM »
I tried a 470uf on 4 and 11, no dice.  I'm pretty happy with this the way it is, but I'll try the 100n's. I think the circuit is what it is, and I really enjoy it's overall sound. I've seen some layouts with everything split Into single opamp but reports are that they still tick here and there.

Get those wires as short as possible and shield the in and outs to/from everything, making sure to ground only one end of the shielded cable.

lulu_joe13

Got a oscilliscope
« Reply #342 on: November 16, 2017, 12:20:50 PM »
Taylor, perhaps this is a question beyond good support but if you have time can you answer or send me where there is some instruction. I just got an oscilloscope and want to use it to tune my Gristleizer. Where do I attach the test lead on the PCB to adjust the shape or is it on the leg of trim trim pot and ground? What about for the offset? Thanks as always for any help. JoeF.

Taylor

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Re: Anybody build their Gristleizer yet, comments on it?
« Reply #343 on: November 16, 2017, 12:37:02 PM »
For both, you can view the LFO waveform by probing at the center lug of the Depth pot.

arpaxxe

Re: Anybody build their Gristleizer yet, comments on it?
« Reply #344 on: January 03, 2018, 01:01:19 PM »
Hey all. This thread's been great to read through.


I've got everything installed but the only thing I'm getting out of it is a steady click. The click isn't affected by changing the speed, but it does go away if I back off the level all the way. I've confirmed the placement and connection of the ICs, caps, transistors, and diodes. Corrected a mistake on the ac jack. Reflowed a bunch of connections that looked shady. Still, nothing.

I'm wondering what steps I should take next. Does anyone have advice on how to continue debugging? This isn't my first build, but I am a bit rusty for sure.

Thanks!

Bryan

BetterOffShred

Re: Anybody build their Gristleizer yet, comments on it?
« Reply #345 on: January 03, 2018, 04:18:28 PM »
Make sure your 4 way rotary is wired correctly, are you certain of your FET's pinout?   I used 2N3819 in mine and it was a different pinout than the advertised for that chip, so I'd recommend testing it with something like a Mega328 if you have one.   What Diodes did you use?  I had a broken diode (glass germanium 1N34A) that gave me hella problems with mine, it looked fine but was cracked.

Also this pedal will make no noise if the bias knob is in certain positions, so tool around with that too.   I ended up putting a 47K resistor on one leg of a B10K and I think a 30K on the other leg, to get a more useful sweep since in all 4 settings the bias knob only has a little window (at 100K) where it did anything.     

arpaxxe

Re: Anybody build their Gristleizer yet, comments on it?
« Reply #346 on: January 03, 2018, 07:19:18 PM »
Thank you. I'll check this. Much appreciated.

Bryan