Search found 7 matches

by Lud
Tue Feb 24, 2015 7:25 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

Hi Joe, actually i have spoken prematurely. The comp works excepted that the threshold doesn't work on a small section : between the eighth and the seventh lines, the sound is not processed. Do you have an idea of what it could be? Maybe a bad soldering point? And also the link mode does not work an...
by Lud
Thu Feb 19, 2015 8:28 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

The white LED in the meter is a 3v type normally. You cannot add any series resistance as this will mean the bypass relay which is series with the led and 1k8 on the MAC PCB will not operate properly. The needle is very easy to bend but usually means the black plastic set screw on the front of the m...
by Lud
Fri Feb 06, 2015 4:01 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

Cool good to hear you got it to work and like the sound. Make sure you have the led wires the correct way around? You can try both ways as it is safe to do so. If the led doesn't light when the unit is switched to VU or GR then the LED has been blown. The LED does turn off when switch is in off. All...
by Lud
Tue Feb 03, 2015 5:46 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

[/quote] If the meter led doesn't light then the bypass relay will not operate so the comp will not be switched in. Add a wire across the back of the meter shorting out the two LED terminals to see if the comp switches in then, If so the led has been blown and will need replacing.[/quote] Hi Joe, i'...
by Lud
Mon Feb 02, 2015 12:08 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

Hi Joe, i'm asking some help cause my second LA500 is not working, although things seemed easier to make compare to the first one : So, when engaged, the vu meter is not iluminated although it responds well. Sound is passing through the unit without being processed even though the signal seems to p...
by Lud
Mon Jan 26, 2015 2:21 am
Forum: JLM Audio Kits
Topic: LA500 opto comp leveling amp BUILD THREAD 500/51X
Replies: 221
Views: 215973

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

Hi Joe, i'm asking some help cause my second LA500 is not working, although things seemed easier to make compare to the first one : So, when engaged, the vu meter is not iluminated although it responds well. Sound is passing through the unit without being processed even though the signal seems to pa...

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