Amp with DC out

nonprof

Member
2011-06-08 1:33 am
Hello!

Good Day!

I have this problems in mono 850 Watts rms amplifier. This is China made amplifier.

Problems:
1. 14V DC out
2. When subwoofer is connected it produces whinning sound and popping but still has a clear music.

Symptoms:

When speaker is not connected:
1. DC out at 14VDC but not protect, rail voltages are normal.

When speaker is connected:
1. Positive rail voltage increases up to twice from its operating voltages
63VDC -> 115VDC.
2. Negative rail decreases from -63VDC to -55VDC.
3. Produces whinning sound and popping but still has clear music.

Thank you so much! Please help....
 

Attachments

  • 03092016275[1].jpg
    03092016275[1].jpg
    517.2 KB · Views: 91