@Gnobuddy @Turbowatch2 will need your assistance.
I have tried both options ( 1 PSU and 2 PSU way ) both did not blow the board. The problem I have is with both options as soon as I turn on the AMP the VU meter will go all the way to the right. When I measure voltage which goes to the VU meter the minimum I can get from the blue potentiometer is 0.4V it where it hits bottom. It is the state when if I turn the volume on AMP up it will start respond to the sound but the hand is at the + sign ( above 5 ) . When I start cranking the blue potentiometer up to 1V the VU meter hand will go further right. It seems like what I need is to go DOWN below 0.4V on the VU Meter to get to the black numbers.
Any idea what could be wrong?
I have tried both options ( 1 PSU and 2 PSU way ) both did not blow the board. The problem I have is with both options as soon as I turn on the AMP the VU meter will go all the way to the right. When I measure voltage which goes to the VU meter the minimum I can get from the blue potentiometer is 0.4V it where it hits bottom. It is the state when if I turn the volume on AMP up it will start respond to the sound but the hand is at the + sign ( above 5 ) . When I start cranking the blue potentiometer up to 1V the VU meter hand will go further right. It seems like what I need is to go DOWN below 0.4V on the VU Meter to get to the black numbers.
Any idea what could be wrong?
I did a test
connected the AMP with PC via 3.5mm and with Y splitter connected second cable coming from PC to the VU Meter. Now all works as intended.
The vottage on input from PC is 0.01V vs 0.9V from AMP. ( on audio, L/R )
Vottage on VU meters comming from the VU meter board ( Red/White ) is somewhere between 0.03V peaking at 0.12V with hand in the middle of the scale. Compare to 0.42V min using audio from AMP.
It seems it will not be possible to connect these bad boys directly on AMP output rather use splitter for AUDIO LINE IN. Unless I somehow cut the vattage on audio from the AMP.
connected the AMP with PC via 3.5mm and with Y splitter connected second cable coming from PC to the VU Meter. Now all works as intended.
The vottage on input from PC is 0.01V vs 0.9V from AMP. ( on audio, L/R )
Vottage on VU meters comming from the VU meter board ( Red/White ) is somewhere between 0.03V peaking at 0.12V with hand in the middle of the scale. Compare to 0.42V min using audio from AMP.
It seems it will not be possible to connect these bad boys directly on AMP output rather use splitter for AUDIO LINE IN. Unless I somehow cut the vattage on audio from the AMP.
finished, turns out power was not the problem but the audio, these devices are designed for line audio with very low power so instead of 2 power supplies this device has only one but 2 audio inputs. One for the AMP and one for the VU meter.
Thank you all for support
Thank you all for support
Glad you got it sorted.
The red-herring about the board needing 9V AC audio signal caused lots of unnecessary confusion.
Sorry to have been gone for days, been dealing with health problems.
-Gnobuddy
I have a similar situation to what ZMathers was facing. Can i connect the 48v SMPS ground to the 12V SMPS ground, while both are connected to the same AC mains supply. There are HF transformers within the SMPS as i understand, so will it cause an issue. The dotted line for [G, L,R] of the VU Meter board input is what i am concerned about. The VU Meter board has a rectifier, but eventually it would be grounding the 12V Supply to audio ground. Appreciate any enlightenment around this.
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Hello. I created an account because of this post. I am trying to do the exact same thing as the OP. I connected the board to speaker output and it worked for a sec before I turned up the volume and smoked the board. Rectifier, I think. Anyway, I ordered another set and an output converter. Seems if I can convert speaker output to line out signal it should work. Anybody think otherwise? Thanks!