Search found 9 matches

by no2
Tue Mar 06, 2012 11:33 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Alright, thanks so much Joe!!!

I'll definitely recommend this experience to other audio nerds I run into.

It sounds great too.
by no2
Tue Mar 06, 2012 1:28 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

OK I tried my other interface and I get 1.28vac on the output TS cable. I plug that in to DAC and I get -18dBFS on the DAC. So 0 VU = -18dBFS as it should . On the la500, with both threshold and makeup pots fully CCW the VU meter reads -20 dB with no tone and it reads 0db with tone. with both pots f...
by no2
Fri Mar 02, 2012 10:01 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Ok something wrong in the measuring there. So may be easier to plug the LA500 output into your A/D. If you know the input level your A/D clip or hits 0DFS is +18dBM for example. Then when the software meter shows -14dBFS this will equal +4dBM. But the exact level 0VU should be for you system depend...
by no2
Fri Mar 02, 2012 4:48 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

OK it's real close. But I cannot get 1.23 vac. I get 2.1 vac at all times on the XLR output. And I get 3vdc on the zero GR trim pot. However, I did get both GR and VU to have the exact same readings on the analog meter. So both read 0vu when the tone is on and both thresh and makeup pots are fully C...
by no2
Thu Mar 01, 2012 11:47 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

OK adjusting the meter 0vu trim pot has made the makeup gain pot read 0 vu on the analog meter when further CCW than before. So that works. the lunchbox XLR pin reading is 0.4vac when nothing connected and is 0 vac when la500 is connected. I think I broke the ZERO GR trim pot because I turned it all...
by no2
Sat Feb 25, 2012 12:05 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

OK you should have about 4v on the outside terminals of the zero trim pot? As there is only a 2k7 resistor in series with the pot and the 16v rail. OK the threshold 100k log pot only gives me 26k on ohmeter when leads placed across outside terminals of the pot, regardless of any/all switch settings...
by no2
Fri Feb 24, 2012 12:37 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Let me know the voltage you get across the meter when switched to GR? And if you are getting audio out of the LA500 when switched to GR or VU? I am getting an audio signal through the comp in both GR and VU. I am able to move the meter a lot in VU and just a smidge in GR I'm not sure how to read vo...
by no2
Thu Feb 23, 2012 3:25 pm
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Thanks Joe for your efforts and time. I sent those photos and I'll get back to you on the other stuff soon.
by no2
Thu Feb 23, 2012 12:57 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 223
Views: 587664

Re: LA500 opto comp leveling amp BUILD THREAD 500/51X

Here's my thoughts on being a complete beginner to DIY electronics and choosing the LA500 to be your first project. This was a very enjoyable project and I still have a little trouble shooting to do but I am sure glad that I didn't try to build an 1176 right off the bat. If I was at the same place w...