VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Support for JLM Audio Kits

Moderator: Joe Malone

User avatar
Joe Malone
Site Admin
Posts: 1657
Joined: Wed Jan 24, 2007 11:35 pm
Location: Brisbane, Australia
Contact:

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post by Joe Malone »

wave wrote:Hello,
I've put one of these together for a client and I'm trying to calibrate. Is there a procedure for calibration using a standard function generator?
Preferably one that I can count LEDs to align with as I don't have the purpose made JLM meter scale.
Also, I'm not understanding how to jumper the unit so the LEDs are in full brightness mode all the time. I can apply a jumper to position 1 and get the 2.5V dimming or I can remove it and I get the dim then brighter with level behavior.

Thanks!
Dave
For full brightness fit jumper in header which will link pin to 0v for full brightness.

Put in 1khz tone and turn input trimpot RV1 up until you have just lit the 40th red led. Then turn up VUPPM balance trimpot RV2 until the 40th green led just lights. Cal between VU and PPM is not done. Adjust input trimpot to maximum input level for your system.
Joe :-)
JLM Audio
Capturing Audio without Injury

wave
Posts: 3
Joined: Thu Aug 08, 2019 4:16 am

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post by wave »

Hi Joe,
Thanks for the reply. I'm still confused. Which pin(s) do I jump? Also, I'm assuming I feed 1.228VAC from the generator and I have done that but it seems that normal program just slams the meters full. There are 4 banks of 10 leds so the 40th is the very last LED on the unit, correct? Some pics would aid tremendously.

Thanks,!

wave
Posts: 3
Joined: Thu Aug 08, 2019 4:16 am

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post by wave »

I really need some further guidance. I am just not seeing how to jump for full brightness. Can someone please elaborate?

User avatar
Joe Malone
Site Admin
Posts: 1657
Joined: Wed Jan 24, 2007 11:35 pm
Location: Brisbane, Australia
Contact:

Re: VUPPMGR40v3 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD

Post by Joe Malone »

wave wrote:I really need some further guidance. I am just not seeing how to jump for full brightness. Can someone please elaborate?
Fit shunt jumper to first position of header as shown on attachment
You do not have the required permissions to view the files attached to this post.
Joe :-)
JLM Audio
Capturing Audio without Injury

Post Reply