1

MP512 Microphone preamplifier / Re: Clipping/distorting noise on High Z input

« on: August 24, 2026, 10:15:24 AM »

Looks like the components are inte right place and soldered correctly. Voltage on R46 top pin measured to 7.7V.

What do you think about the measurements on R48? That's whats has been off so far.

Thanks,
Tobias 

2

MP512 Microphone preamplifier / Re: Clipping/distorting noise on High Z input

« on: August 20, 2026, 10:10:41 AM »

Thank you for getting back so quickly.

Q2 is in the correct position.

R51:
15.77V near C24
15.92V near connector

R48:
131mV near R41
1V near C23

So something seems off when looking at the measurements at R48?

Thanks,
Tobias

3

MP512 Microphone preamplifier / Clipping/distorting noise on High Z input

« on: August 17, 2026, 08:03:05 PM »

Hi!

Recently finished my latest build. Everything works except when connect the DI. I can hear the source (bass in this case), but it sounds like it's clipping/distorting even on low gain. Any idea what could cause this?

I should mention that when I first tried the DI I coulnd't hear anything, but that was because I had missed soldering a couple of the resistors on the DI board. After doing that I got sound but got the problem mentioned above. I hope I didn't mess anything up by testing it without all parts soldered first.

Thanks,
Tobias