Search found 14 matches

by kings79
Wed May 26, 2021 9:13 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

I had that.

Diodes or no Diodes. That is the question....
by kings79
Thu Mar 25, 2021 1:55 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

The buffers once set to a gain are perfect amps and we never see difference between even cheap meters left to right. The only tolerance would be the meters or if one of the BAT85 has gone open circuit so not fully rectifying. Easiest way to prove were the problem is. Swap the meter plugs over on th...
by kings79
Thu Mar 25, 2021 11:28 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Yes without the rectifier it will be AC volts going to the meter. With rectifier on VU2 then the meter will get DC. Ok. That makes sense. I've just done a test on my SEW ST-475's with your original mono VU buffers and they don't scale to 1dB increments exactly either. Ive been mixing TV shows with ...
by kings79
Tue Mar 23, 2021 1:52 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the them as the scale is not calibrated to the meter coil in your meters. But there is no voltage coming from the 'M' + & - now though. Is this how it's suppo...
by kings79
Tue Mar 23, 2021 11:55 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4. Now the VU's don'e work at all... Im only getting 0.8mV across the + & - of the 'M' terminals. OK your meters do not have any rectifier in them then. The closest you will get is to what you had with diodes on the VU2 before you removed the t...
by kings79
Tue Mar 23, 2021 10:12 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Ok, pulled off all 4 diodes and put 2 jumpers on D1 & D4.
Now the VU's don'e work at all...
Im only getting 0.8mV across the + & - of the 'M' terminals.
by kings79
Mon Mar 22, 2021 3:41 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find. But the meter should work on the audio line as that is what they were designed to do but they add distortion so a buffer is th...
by kings79
Sun Mar 21, 2021 3:22 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Just try them on the buffer output with diodes fitted on buffer to see if they work and do 1dB steps to see if the lineup to the scale or not and let me know what you find. But the meter should work on the audio line as that is what they were designed to do but they add distortion so a buffer is th...
by kings79
Tue Mar 16, 2021 2:58 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Ok, will do.

Got the PCB today.

Cheers Joe.
by kings79
Tue Mar 16, 2021 1:58 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

2 different VU meters didn't as I said.
by kings79
Tue Mar 16, 2021 7:26 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

I measured across the VU with my Peak Atlas Pro.

I get VF=3.17V @ 5.31mv. So there must be a diode in there.

Image
by kings79
Mon Mar 15, 2021 3:40 pm
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Putting the VU's across my Sound Card yields nothing. Even tried with cheap little VU's I have laying around. Tried a bunch of different cables and alligator clips. The sound card goes through a patchbay. I do have an old pair of VU's made with your original PCB's and that works fine with the same O...
by kings79
Mon Mar 15, 2021 10:22 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

This thread is for the whole stereo VU meter kit we sell. The other thread is for the VU2 kit. But both can help with building the VU2. Wow 50ohms is very low and hard to drive for a meter? I presume this is a mistake in the text. Most VU meter would be 200uA to 500uA. These meter do not have the l...
by kings79
Mon Mar 15, 2021 8:21 am
Forum: JLM Audio Kits
Topic: VU2 stereo VU buffer kit Build thread
Replies: 139
Views: 321391

Re: VU2 stereo VU buffer kit Build thread

Hey All, happy to be here. I Just bought the VU2 Stereo VU Buffer PCB Has anyone used these TN-73 VU Meter https://www.amazon.com.au/Amplifiers-Header-Chassis-Internal-Resistance/dp/B08PBH9DP1/ref=sr_1_1?dchild=1&keywords=%23N%2FA+Set+of+2pcs+TN-73+VU+Meter+Power+Amplifiers+Audio+DB+Level+Header+Aud...