1

LA502 Optical Compressor / Re: LED MEtering

« on: June 11, 2022, 02:33:49 PM »

resoldered. cn1 pin 9: -16.02V

U9 Pin 4 1.38V
U9 Pin 5  2.49V

2

LA502 Optical Compressor / Re: LED MEtering

« on: June 10, 2022, 10:40:00 PM »

la502 measurement

3

LA502 Optical Compressor / Re: LED MEtering

« on: June 09, 2022, 02:22:25 PM »

Hope this image gets uploaded properly^^

4

LA502 Optical Compressor / Re: LED MEtering

« on: May 08, 2022, 05:04:37 PM »

Are the Voltages dependant on any input source or is it just the Box that has to deliver it's +/-16V? From what I "guessed" from the scematics they aren't, but I'm quite a newbie.

5

LA502 Optical Compressor / Re: LED MEtering

« on: May 06, 2022, 11:45:45 AM »

Solders are good U7 is the TL431A

Voltages on R36 are 15,9V left 2,49V right

6

LA502 Optical Compressor / Re: LED MEtering

« on: May 03, 2022, 04:34:03 PM »

Following measurements:

U8 Pin 13 to 0V-TP : 0,444VDC
U9 Pin 2   to 0V-TP : 1,277VDC

no changes on turning p4/p5

7

LA502 Optical Compressor / Re: LED MEtering

« on: April 25, 2022, 03:13:41 PM »

Revision is the Scematic 2.1 PCB rev 1.4

I did in fact setup the LED the wrong way at first. bought some new LEDs cause I heard they're done if setup wrong, and soldered a 2nd set with the added PCB part given, but still didn't work, maybe I killed the IC's?

8

LA502 Optical Compressor / LED MEtering

« on: April 24, 2022, 04:01:51 PM »

Unconventional question.

When I setup the compressor everything works soundwise, but I can't get the LED meterbridge running, I resoldered everything, triple checked Resistors etc. Rebuild the LED meterbridge. But it won't work.

I case I f***ed up completly, can I run the compressor without having the potentiometers set up? SO I can work with it "blindly" at least?

9

LA502 Optical Compressor / R5-R6 new layout

« on: March 24, 2022, 12:37:27 PM »

put resistors r5+r6 like in the partslist 100k or like in th layout with 22k+2M2?

10

SK25/SK99 Discrete Op-Amp / Re: R10 Burnt on

« on: November 26, 2021, 06:13:55 PM »

It was the Q9/10 swap in the end..only failing parts where the 3 resistors...but disassembling the DOA was...let's say not quite worth the time not even for spare parts...the new one did the job, and the "CP 5176" is already on duty. Thanks for your time and very well written documentations. This was totally on me^^

11

SK25/SK99 Discrete Op-Amp / Re: R10 Burnt on

« on: November 15, 2021, 04:50:01 PM »

What else...fml..TY. As stated above I ordered a new one already, still wondering if it would work, when I swap out Q9/-10 and the failed resistor as some sort of spare part..or if there might be more broken so it's not worth keeping it.

12

SK25/SK99 Discrete Op-Amp / R10 Burnt on

« on: November 14, 2021, 12:59:58 PM »

I triplechecked the layout before setting the DOA in as mentioned in the calibration-guide building the CP5176. R10 on the DOA and R56/57 on the main PCB burnt immidiatly at step 6 where i insert the DOA. I read a topic about what to do if r56/57 burns and ordered a new SK25 and also went shopping for some backup resistors and stuff. Strange to me is what caused the DOA itself fail at R10 and what might have caused it which i didn't see on a triple check.

thanks in advance F.R.