no name amp

timwebb · 2012-12-09 4:54 pm

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 · 2012-12-09 5:41 pm

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

timwebb · 2012-12-09 6:23 pm

yea but the number sanded off.

brandes.cm · 2012-12-09 6:31 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 · 2012-12-09 6:33 pm

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

Monoblock High Power Class D Amplifier By Ronfa Electronic, China

timwebb · 2012-12-10 1:50 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 · 2012-12-10 2:13 am

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

timwebb · 2012-12-10 2:28 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 · 2012-12-10 2:53 am

the amp dont have a name

Perry Babin · 2012-12-10 3:08 am

Compare it to the following board.

timwebb · 2012-12-10 3:15 am

thats it. just wanna be positive. on it.

Perry Babin · 2012-12-10 3:22 am

It's funny that you can buy these amps for $115 each if you buy 200 of them.

timwebb · 2012-12-10 3:38 am

i know right. this amp look like it was put together by hand from the soldering... i think the 494 is gone in the one posted in the picture. the amp lights up and the relay click i get 3v on the ps gate but no wave period.

timwebb · 2013-03-05 5:33 am

i pulled this back out. it had design flaws.a ground was printed on the board running to a transformer.are my findings right for the transistors on the driver card?

AG-BCX52-10
DK-BCX42
or
2SC4672
2SA1797

Perry Babin · 2013-03-05 4:50 pm

The bottom two should be the right transistors.

MatthewS · 2013-03-06 5:44 pm

'We make goo for u.. we make jus like this one for u.. fi dolla..'

Ever wonder which American manufacturer we have to thank for the first move to Asia that started this trickle down effect of 'if we wanna stay in business we have to follow' ? I'd like to write them a letter

Neat amp

timwebb · 2013-03-06 6:32 pm

It's nice..its like the hifonics Bxi amps.

no name amp

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