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diyAB Amp  The "Honey Badger" build thread
diyAB Amp  The "Honey Badger" build thread
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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
jwilhelm is offline jwilhelm  Canada
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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
Kay Pirinha is offline Kay Pirinha  Germany
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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?

Best regards!
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Old 30th May 2017, 11:05 AM   #2784
mbrennwa is offline mbrennwa  Switzerland
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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
Kay Pirinha is offline Kay Pirinha  Germany
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At least these jumpers won't harm .

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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
outtek is offline outtek
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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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Old 7th July 2017, 08:08 PM   #2788
Obisix is offline Obisix  Hungary
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Hi dear Diyaudio!


I haave problems once again. My amplifier is up and running nicely.... well, sort of nicely.
If anyone can help me what that could be that would be awesome!

Let's see what is happenning to better understand my problem: I have a Focusrite 18i8 Audio Interface connected to my computer. After that interface comes my beloved honey badger, then my ATC speakers.

I turn on the amplifier after the audio interface. No problems, no noise, works well.
I start to work on my speakers. Suddenly, a high level static noise comes in, sometimes goes away after 1 secs with a "poof" sound. But most of the times, it stays. It stays and gets louder and louder slowly... UNLESS!
Unless I turn up the volume knob on my Focusrite 18i8. The noise begins to be louder, louder, then, it stops for some time, then it starts again after some minutes of silence. I attached an audio clip of this event: Making speaker louder to stop noise.
Ground loop is eliminated through Loop breaker circuit, and for some strange reasons, if I disconnect the audio interface, and turn the amp back on, it remains silent.

Another strange thing is that if I touch the cables, moving the cables which interconnect the amp and the interface makes a "scratchy" sound, I have attached a sound sample of it too: These sounds come from the speakers if I move the cables.

So my Idea is that there might be something wrong with my audio interface. But what could go wrong? What is making my cables "sizzle"? It is a Klotz cable, with neutrik connectors, so it can't be low quality... Please help me!
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Old 9th July 2017, 05:08 PM   #2789
mbrennwa is offline mbrennwa  Switzerland
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I couldn't download the first sound sample, but the second worked. Sounds like some static thingy (no hum or similar). Do you have a bad volume pot in the Focusrite?

Some tests and suggestions:
  • Does this happen only with a source connected to the amp? What if you leave the input of the amp unconnected? What if the input is connected to GND?
  • Try different sources! A phone with a headphone out might do for testing purposes. Does the noise go away with different sources?
  • Try a different amp with the Focusrite. Does the noise go away?
  • Try different audio cables.
  • Is this a laptop computer? Try running it off its battery, without any connection to the mains line. I once had issues with a poorly isolated USB interface that coupled some noise to ground.
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Old 15th July 2017, 10:33 PM   #2790
OZ6YD is offline OZ6YD  Denmark
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Quote:
Originally Posted by mbrennwa View Post
Maybe try a "thermal bus bar" as shown in the HB build guide (you can download the PDF from the diyaudio store). This would easily allow you to 'skip' the drivers in your build.
I have talked to an electronic engineer today and he said, that you have to use this thermal bar with Q13 because if you place it direct on the big main heatsink Q13 wont be able get working temperature quick enough and will make mish match on Q14 and Q15 from the beginning and this will sound very bad.

Best regards,

Henrik
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