Hi everyone, this is my first post here.
I've been having issues recently with two brand new class D amplifiers that a friend gave me. When I put power through it (the polarity is right and I tried with 2 PSU and a 12V battery) it puts out loud POPs every second, it's a regular pulse, and I draws about 2 to 3 amps on 12 or 19v every time it pops and the IC and coils gets real hot after a couple minutes.
It seems to have happened when I connected the audio input minus cable to ground.
any clues ?
I'll try to reccord the audio tomorrow.
Sorry for my approximative english
I've been having issues recently with two brand new class D amplifiers that a friend gave me. When I put power through it (the polarity is right and I tried with 2 PSU and a 12V battery) it puts out loud POPs every second, it's a regular pulse, and I draws about 2 to 3 amps on 12 or 19v every time it pops and the IC and coils gets real hot after a couple minutes.
It seems to have happened when I connected the audio input minus cable to ground.
any clues ?
I'll try to reccord the audio tomorrow.
Sorry for my approximative english
You're not giving us much meat on the bone with which to speculate here... At least identify the amp modules for us?
As the problem turned up when you connected the input minus to the ground, I suspect a ground loop or DC offset on the input.
Try to disconnect the amplifiers inputs entirely, and do not run any of them to ground either. Is the problem still there?
At least in the Hypex UcD series, which is differential input, it is stated in the connection guide, that if you want to run unbalanced (with RCA connectors), one should connect it as follows:
-Disconnect the safety earth from the mains input, so that it is NOT connected to the chassis.
-Follow double isolation standards when building the amp. (Important when not having safety earth).
-Connect the amplifiers negative input to the rca ground terminal.
-Connect the amplifiers input ground to the rca ground terminal.
-Connect the rca ground terminal to the chassis.
-Connect the amplifiers positive input to the rca input.
Johan-Kr
As the problem turned up when you connected the input minus to the ground, I suspect a ground loop or DC offset on the input.
Try to disconnect the amplifiers inputs entirely, and do not run any of them to ground either. Is the problem still there?
At least in the Hypex UcD series, which is differential input, it is stated in the connection guide, that if you want to run unbalanced (with RCA connectors), one should connect it as follows:
-Disconnect the safety earth from the mains input, so that it is NOT connected to the chassis.
-Follow double isolation standards when building the amp. (Important when not having safety earth).
-Connect the amplifiers negative input to the rca ground terminal.
-Connect the amplifiers input ground to the rca ground terminal.
-Connect the rca ground terminal to the chassis.
-Connect the amplifiers positive input to the rca input.
An externally hosted image should be here but it was not working when we last tested it.
Johan-Kr
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