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Old 9th December 2012, 03:54 PM   #1
timwebb is offline timwebb  United States
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Default no name amp

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.
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Old 9th December 2012, 04:41 PM   #2
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Are they not the six transistors on each end, just like the DWM3640 that has 8 per side.
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Old 9th December 2012, 05:23 PM   #3
timwebb is offline timwebb  United States
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yea but the number sanded off.
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Old 9th December 2012, 05:31 PM   #4
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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.
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Old 9th December 2012, 05:33 PM   #5
timwebb is offline timwebb  United States
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thanks here is the amp...all i can find on it.

Monoblock High Power Class D Amplifier By Ronfa Electronic, China
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Old 10th December 2012, 12:50 AM   #6
timwebb is offline timwebb  United States
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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.
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Old 10th December 2012, 01:13 AM   #7
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Do you have the square wave on the gate or DC voltage?
What are the other pins doing?
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Old 10th December 2012, 01:28 AM   #8
timwebb is offline timwebb  United States
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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
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Old 10th December 2012, 01:53 AM   #9
timwebb is offline timwebb  United States
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the amp dont have a name
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Old 10th December 2012, 02:08 AM   #10
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Compare it to the following board.
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