Sound Skulptor forums

Build help and troubleshooting => LA502 Optical Compressor => Topic started by: adalogue on September 05, 2021, 09:21:55 PM

Title: All LEDs locked on
Post by: adalogue on September 05, 2021, 09:21:55 PM

I’ve turn all the trim pots fully CCW. I am getting proper supply voltages (V+ and V-), even at U8/U9 comparator ICs. GRM signal is 0VDC. Otherwise unit appears to work (passes signal, get 24VAC at full gain, peak knob at 100 gets output down to < 1VAC, etc.)

Title: Re: All LEDs locked on
Post by: JPK on September 06, 2021, 08:18:21 AM

You may have an issue around U7-R36. Check value, direction and solder joints.
What DC voltage do you get on R37, any side against 0V?

Title: Re: All LEDs locked on
Post by: adalogue on September 06, 2021, 09:10:44 PM

Solder bridge in that area found and fixed (now 15.5 and 2.5 VDC between each leg of R36 and GND, was 15.5 and 0 VDC but no short to GND).

Thank you, fun build!