Help! Just finished my Helder TA2020 MKIII and I'm getting buzzing - diyAudio
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Old 31st October 2010, 10:51 PM   #1
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Default Help! Just finished my Helder TA2020 MKIII and I'm getting buzzing

I finally got around to assembling my Helder TA2020 MKIII and finished (99% done) it today. Thus far it sounds fantastic, though I am having one issue. This may not be an issue as I still need to buy knobs for the pot and switch, but when I touch the pot adjustment post I get a not extreme, but noticable, buzz or feedback through the speakers.

This is my first project attempt at a DIY amp of any sort and I'm not above stupid mistakes. If anyone has any idea as to how I might remedy the problem I'd love to hear some suggestions.

Thanks,
Chris

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Old 31st October 2010, 11:14 PM   #2
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Grounding the body of the pot/switch should fix it up.
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Old 31st October 2010, 11:18 PM   #3
parb is offline parb  United States
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my guess is that you need to connect the body of pot to ground. it should have come with a ground lug, a round piece that goes over the axel of the pot and has one end with a "pointy tip" on it. solder a piece of wire to the tip and connect the wire to ground. mount the lug on the inside of your box but on the volume knob axle itself and i suspect you will find that this will make your amp quiet.
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Old 1st November 2010, 12:19 AM   #4
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I always use metal cases for my audio so it acts as a screen.
It should always been earthed.
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Old 1st November 2010, 01:15 AM   #5
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Yeah I would have liked to have used a metal box. This being my first amp project, I was trying to keep it cheap in case it went bust.

I'll ground the pot and give that a go. Thanks for the suggestions.
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Old 22nd January 2014, 12:30 PM   #6
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Exclamation RIFA PHE

Hi, my friend gave me a Helder hifi ta2020 MKIII and I´m trying to put it together. Along with all the parts, there´s a RIFA PHE 426 300 (100nKBRD) capacitor but I don´t have a clue of where it goes in the amp. What does it do anyway? Thanks!
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