Search found 8 matches
- Wed Sep 15, 2021 5:22 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Looks like the issue resolved itself when I pulled the boards last time and reassembled. I'm guessing it's related to the ribbon cables somehow - either a loose connector on one of the headers or an intermittent lead. Either way, both LED'w are lighting now without any changes.
- Sat Sep 11, 2021 4:45 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Yes, I regularly keep the threshold pot pulled out for slower attack.
- Fri Sep 10, 2021 12:31 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
No, checked for continuity between them and they did not short together.
- Fri Sep 10, 2021 8:18 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Here are the pics of the main PCB that you requested, Joe. My phone camera seems to struggle with focus on the back of the boards - I hope this works. I ordered a 500 series extension cable to assist with further testing because I can't access the board with my test probes as is. All other functiona...
- Thu Sep 09, 2021 12:03 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Yes. I will have to reopen tomorrow to take some additional pics, sorry about the focus issue on the last few.
- Thu Sep 09, 2021 11:01 am
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Hi Joe, Not seeing any voltage across the LEDs. I took it apart today to look for shorts, measured the resistors which were fine, checked the header orientations and everything looked good so I’m at a loss. Pics attached. Thanks, BB3A1504-0337-4799-8D93-453BB1454A5B.jpeg 2DFA11A2-CA26-415D-BFBD-861C...
- Mon Sep 06, 2021 10:21 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Thanks Joe,
I slightly shortened the leads and resoldered and reflowed the solder on the 4 resistors but still no luck. Any other ideas? Are these leds faulty often?
Thanks,
I slightly shortened the leads and resoldered and reflowed the solder on the 4 resistors but still no luck. Any other ideas? Are these leds faulty often?
Thanks,
- Mon Sep 06, 2021 12:00 pm
- Forum: JLM Audio Kits
- Topic: LA500A opto comp leveling amp BUILD THREAD 500/51X
- Replies: 211
- Views: 526197
Re: LA500A opto comp leveling amp BUILD THREAD 500/51X
Hello Joe, I just finished my La500a build and everything seems to be working except the two LEDs which aren’t lighting at all. I believe I placed the 4 resistors on that board properly and made a solid connection with the led legs, with the long leg to the + square terminal. For calibration I sent ...