THAT pedal schematics

Free online ressources on guitars, amps, effects, guitar technique and more. Dedicated to the fond memory of its founder SPeter Davidoff.
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karul
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Post by karul »

Use these schematics as a starting point for your own creative guitar pedal projects. We plan to expand these pages with applications beyond compressor/ limiters. Check back often for new designs and current revision levels.
1) 4315-based Battery-Powered One Knob Squeezer
2) 4315-based Guitar Compressor with Variable Attack and Release
3) 4316-based Simple Limiter
4) 4316-based Guitar Compressor
5) 4316-based Battery-Powered One Knob Squeezer
6) 4320-based Battery-Powered Compressor
7) 4320-based Battery-Powered One Knob Squeezer
8) 4320-based One Knob Squeezer with Balanced Outputs

http://www.thatcorp.com/pedals/index.html

http://www.thatcorp.com/THAT_Design_Support.shtml

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Dirk_Hendrik
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Post by Dirk_Hendrik »

Thanks! Hadn't seen that yet!
And wow... a pedal page dedicated to compressor designs only!
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

karul
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Post by karul »

THAT have nice info for mic preamps, I was surprised when I saw this page. I recently saw Amtweaker's PressuRizer compressor. According to this thread it's build with THAT IC. I didn't find which one, but it lead me to that page. It's an interesting and unique compressor, that's for sure.
When I spoke with James, he had this to say:

"I used a THAT chip set, which is the same parts used in DBX stuff, and while tweaking it out I found I could OVER compress it enough to get the compressed signal to be basically gone. Blend it to the dry, and you get dry at first, followed by compressed signal that lasts. Plus since the Tone only affects the compressed part, it helps you dial out the midrange that compression tends to add, or make it get a little brighter as the note dies off and becomes naturally darker. The result is you can make it get louder over time like a hollow body, or you can make it sound really natural like there's nothing on there. If you crank the sustain and set it wet, it's like using an envelope follower trying to sound like a big violin swell....nothing at first and then the note comes in so you need to blend it more than half and half dry to get an even blend. If you mix it half and half, you get a bloom, hence the name. And then the output FET Limiter circuit is AFTER the blend. So it affects everything and lets you do a bit of limiting on that initial attack too."
https://www.talkbass.com/threads/testin ... 38/page-49

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Post by garcho »

Not a pedal but there’s this wonderful THAT compressor project:


http://gyraf.dk/gy_pd/ssl/ssl.htm

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