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Old 29th May 2017, 10:13 PM   #2781
Obisix is offline Obisix  Hungary
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I am devestated.... I just built today a loop breaker circuit to eliminate ground loop, and as I connected it to the circuit, the test speaker started to give out huge noise.. Both Left and Right V+ leds stopped working. I tought: Oh well, the fuses blew.

But then, when I watched the fuses, they had no problems at all. removed the fuse, started the amp, and the V+ is still glowing!

So maybe the R53 burned... I replaced it, but it still buzzes like hell and doesn't give out any sound... I don't know how to diagnostize the problem, I watched everyting, and everything seems to be normal from the outside.

Please help me!

UPDATE:
Pretty Noob thing from me: Found out that the output jack from my audio interface was halfway out, that caused the huge noise.... Sorry for the alert. Now I have sound. But still, I have hum, even with the loop breaker circuit.
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Last edited by Obisix; 29th May 2017 at 10:42 PM.
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Old 29th May 2017, 10:23 PM   #2782
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Start by removing your loop breaker. Something isn't connected properly if it caused the amp to start humming. Some good pictures might help too.
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Old 30th May 2017, 11:01 AM   #2783
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Btw, is it advisable to add jumpers in parallel to the PCB traces at the component side, as shown in these pics?

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Old 30th May 2017, 11:05 AM   #2784
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Quote:
Originally Posted by Kay Pirinha View Post
Btw, is it advisable to add jumpers in parallel to the PCB traces at the component side, as shown in these pics?
I have wondered the same. I believe there were some older boards which did not have connecting traces and therefore the jumpers were necessary. But not on the newer boards. I built mine without these extra jumpers and all is well, as far as I can tell.
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Old 30th May 2017, 11:08 AM   #2785
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At least these jumpers won't harm .

Best regards!
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Old 8th June 2017, 04:51 AM   #2786
OZ6YD is offline OZ6YD  Denmark
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On schematic v. 2.4

D6 have a resistor on 22K and D7 have a resistor on 100K - why ?
They both get 60 volts...
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Old 8th June 2017, 05:13 AM   #2787
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Hi Oz, the different value is because of the color of the LED, the blue one needs less current for a similar brightness. Cheers.
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