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-   -   Audionet AMP 1 idle current (http://www.diyaudio.com/forums/solid-state/202874-audionet-amp-1-idle-current.html)

chris86 20th December 2011 05:39 PM

Audionet AMP 1 idle current
 
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 20th December 2011 06:32 PM

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 20th December 2011 07:00 PM

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

Chris

jacco vermeulen 20th December 2011 07:54 PM

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 20th December 2011 08:06 PM

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 20th December 2011 08:27 PM

200mV ?

0.4A bias is 200mA per output device.

chris86 20th December 2011 09:13 PM

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

chris

chris86 17th July 2013 03:34 PM

Hi i have set the current as i wrote it two years ago. But my problem is, the temperature is to hi. More then 10 seconds to hold the hands on is not possible. Is it ok? I think thats not ok but the current is set to 200mA.

Thanks Chris


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