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-   -   no name amp (http://www.diyaudio.com/forums/car-audio/225323-no-name-amp.html)

timwebb 9th December 2012 03:54 PM

no name amp
 
1 Attachment(s)
im working on a few of these Chinese made amps im looking for the output drivers on this card. or seeing if anyone know a similar board.

brandes.cm 9th December 2012 04:41 PM

Are they not the six transistors on each end, just like the DWM3640 that has 8 per side.

timwebb 9th December 2012 05:23 PM

yea but the number sanded off.

brandes.cm 9th December 2012 05:31 PM

I stated the wrong board, D1820 driver board uses transistors marked DK and AC.

Check the 470 ohm resistors, all of them usually are out of tolerance.

timwebb 9th December 2012 05:33 PM

thanks here is the amp...all i can find on it.

Monoblock High Power Class D Amplifier By Ronfa Electronic, China

timwebb 10th December 2012 12:50 AM

ok on another board the same amp. the amp is dead all i have is the gate voltage in the power supply. i think the 494 is bad.

brandes.cm 10th December 2012 01:13 AM

Do you have the square wave on the gate or DC voltage?
What are the other pins doing?

timwebb 10th December 2012 01:28 AM

no there is no wave on at the gate. here's the pins.
0.0
0.0
0.0
.0.4
0.0
0.0
0.0
12.72
0.0
0.0
12.73
12.70
0.0
0.0
0.0
0.0

timwebb 10th December 2012 01:53 AM

1 Attachment(s)
the amp dont have a name

Perry Babin 10th December 2012 02:08 AM

1 Attachment(s)
Compare it to the following board.


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