Amp6 Basic One Channel

[rwong1]

I have soldered all the components. Found that 1 channel OK but another channel only the tweeter is working, no sound from the bass. Pls help. Thanks

[kwidgebo]

Sounds more like something wrong with your speakers. What speaker setup are you using? Maybe try swapping the speaker outputs. (i.e. take the speaker wires out of whichever channel is working and put them in the speaker that isn't) If one speaker works on both channels, then its your speaker. If the problem persists, then it could be something wrong your amp.

[rwong1]

Thanks.

Have switched the speakers. But still have the same problem. Does anyone konw how to measure output offset voltage.(it is decribed in the page 12, third bullet point of the Assembly Instructions)

[longitude]

Just use a multimeter in DCV mode and measured the output +/-.

[rwong1]

I did measure the output +/-. 1 channel shows 12V, any channel shows 0V. Anything wrong. Pls help. Thanks

[longitude]

Something wrong with the channel which shows 12V...
Never connect your speaker until everything is correct.
Beware! 12VDC can fry your speaker.

[rwong1]

Thanks for your advice.

I finally found that one of the inductor has poor contact with PCB. I re-solder the contact and AMP6-Basic is OK & normal.

[longitude]

Glad to hear that!
Seems that many people encounter large DC offset when there is a bad connection between inductor and PCB.
One of my friend have the similar problem and solved by resoldering inductors.

[firstagainstthewall]

Exact same thing happened to me, but without the +12v offset. Was fixed by resoldering the inductors (the surface mount ones on the amp-6 basic are really annoying)