Re: Hamlet Delay by Jon Patton

Posted by MAO on
URL: http://guitar-fx-layouts.238.s1.nabble.com/Hamlet-Delay-by-Jon-Patton-tp32472p32747.html

I was unable to get the Tails bypass quiet, in fact, I later realized there was still some residual noise with the effect on. Even when battery powered. Thought I had it resolved a couple of times, but when using headphones I found there was still a faint noise in the background.

While audio probing with headphones, I discovered when I removed the charge pump the noise would disappear. (I tried swapping charge pumps, no change)

At this point, I'm not 100% sure if it was the layout causing the issue, maybe the charge pump is too close to the PT2399? Or if I had a bad component/solder joint somewhere I couldn't pin down.  

I suspect it may be the layout though as I ended up unplugging the charge pump, replaced the pump's 1n5817s with jumpers, re-biased the 2n5457 to 4.5v and the pedal is quiet. The tails bypass is quiet as well.

It actually still sounds great with just the 9v supply.

If someone else builds this layout and also has charge pump noise, let me know and I'll re-do the layout and better separate the ICs