Got the boards and they work! Lots of good sounds in here, too. I can get it to cop very similar sounds to some of the echo effects I get out of my Univox Echo Chamber units. I'm not claiming, "OMG this thing totally sounds like a tape delay!!!!!!1!!!". I'm just saying there is some tonal overlap between this circuit and the shitty low-fi tape delays I own.
I need to make a slight change to the layout to move a part pad out of the way of one of the 9mm pot tabs, but otherwise, nothing needs to change on the layout. Couple value changes, but nothing major.
Next step is to populate a second board and chain them together to see what happens!
I did notice some things worth mentioning:
Because the Delay control also changes the filtering on the output of the 2399, this also changes the amount of feedback there is. Shorter times will have more feedback than longer times, so that has to be considered when setting the Oscillate pot (what I'm calling feedback). If you've ever played around with the filtering on a delay, you've probably noticed that changing the cutoff frequency also changes the amount of feedback.
Because this thing has no real active preamp or active blending, turning down Mix also darkens up the tone overall (dry and wet). It will color your dry signal, especially with Mix not at max (which is basically a 50/50 wet/dry). So it's kinda like how some people really like the preamp in the EP3. That "feature" is just part of the deal, so don't expect pristine dry signal integrity.
Anyway, I really dig this circuit, and I'll be boxing up a double. But it sounds really good all by itself, in my opinion.
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