| PT-80 Delay |
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A digital delay project from Scott Swartz. This is an awesome delay/echo stompbox that has received great reviews from the DIY stompbox community! Page down for sound samples. All the ICs are available from Small Bear Electronics LLC.
Would you like a Ready to Solder Circuit Board for this project? 
Buy a PT80 Complete Kit. Includes all the parts and materials you need to build one, all for about the price you would pay for a PCB and parts.
PT-80 Sound Files copyright 2002 by Scott Swartz. All rights reserved Introduction After all the blah blah about how the PT-80 sounds like an analog delay, I threw together a few mp3's to illustrate. The recording signal chain is guitar amp to Royer R-121 ribbon mic (expensive but worth it) to homebrew tube mic preamp to mixer (EQ bypassed) to Tascam CD Burner. The guitar is a 62 RI Strat, set to middle and bridge pickups. Amp is a homebrew Twin Reverb type circuit set for a clean sound with a bit of the onboard spring reverb. The files give a general idea about the sound, but mp3 limitations wash out some of the very fine detail in the sound. You will definitely hear that it doesn't sound like a typical digital delay though. Hear the Sound Files Sound File 1 - The Rockabilly Slapback This is a short passage that starts with a few notes without the delay. I switch it in the delay, and play another single note passage, then conclude with a little Travis picking riff. Control Settings are: Delay Time = 30%, Repeats = 25%, Delay Level = 50%. Sound File 2 - The 175 Millisecond Atmospheric Delay This is a sample of how I typically use delay, set for about 175 ms, 3-4 repeats, and the delay level set to give some atmosphere behind the notes. I play a thirds and sixths riff all the way though, then kick in the delay and play the passage again. Control Settings are: Delay Time = 40%, Repeats = 30%, Delay Level = 40%. Sound File 3 - The Maximum Delay Playing Notes For You Sound This is a passage to demonstrate the sound quality of the repeats when set to max delay (using a 50K pot). The delay level is turned up to match the volume of the dry signal, and then I play a few descending sixths in time with the repeats to create a big wash of sound. At the end, I play a couple of single notes to isolate the repeats sound. The higher note does have some distortion, this isn't present at shorter delay settings. Control Settings are: Delay Time = 100%, Repeats = 30%, Delay Level = 60%.
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