Originally Posted by Jonkan
why not without a scope?
I just built 2ch of api312 clone without a scope, and they sound wonderful. No problems whatsoever.
Im just curious, am i missing something important here? In regards to tweaking the circuit etc?
btw, i can highly recommend api 312 as a good starter project. Very easy to get right, and not hard to find parts for.
the last pre i built (never made it past a very loose prototype) had all sorts of oscillations going on. actually, the thing would sound drastically different each time i powered it on. after trying various filter circuits, i finally drove ~50 miles to a friend's shop w/ a scope, and found all sorts of oscillations going on... and they would change with mic plugged in, open, phantom applied, phase of the moon, etc. etc. etc. i tried swapping opamps & the like, finally got something sort of working, but it didn't sound good, so i ditched it.
the api clone sounds interesting. wanna send me a schematic?