Audionet AMP 1 idle current

[chris86]

Hi friends,

i have an Audionet AMP 1 Amp and the idle current is not ok. The left channel is very hot and the other side is ok. I think the current is the problem. Can you help me to get the correct setting?

chris

[jacco vermeulen]

Have you thought of measuring what the bias is now ?

(the MOSFET types that Audionet uses operate 'best' at 150mA minimum bias each. I gathered that Audionet biases them at 200, makes 400mA in the 2-pair AMP I, 600mA in the 3-pair output device monoblocks)

[chris86]

thanks for your info but can you say me where are the measure points? Is a picture helpful?

Chris

[jacco vermeulen]

At the source resistors, which are tricky in the Amp I, due to the stacked board SMD setup.
Bias is set at the drivers, trimpot on the top PCB (Audionet fancies a driver for each output device)

Your amp boards look pretty much like this (different model, but close to identical boards)
http://blinkhighend.com/products/com..._detail-xl.jpg
See the trimpot on the second floor ?

[chris86]

ok i find the trimpot´s and the measure points. One channel 200mv other channel 140mv. I set both channels to 200mv the temp is identical now. On the audionet homepage is written 0,4A. Now is my setup ok. Thanks for your help

best regards
chris

[jacco vermeulen]

200mV ?

0.4A bias is 200mA per output device.

[chris86]

yes 200mV per channel...
here my measure points -----> with 200mV which would correspond to 200mA per channel. I hope so

chris