Help! Just finished my Helder TA2020 MKIII and I'm getting buzzing

CarbonCrew · 31st October 2010, 10:51 PM

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

DigitalJunkie · 31st October 2010, 11:14 PM

Grounding the body of the pot/switch should fix it up.

parb · 31st October 2010, 11:18 PM

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.

nigelwright7557 · 1st November 2010, 12:19 AM

I always use metal cases for my audio so it acts as a screen.
It should always been earthed.

CarbonCrew · 1st November 2010, 01:15 AM

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.

31st October 2010, 10:51 PM	#1
CarbonCrew diyAudio Member Join Date: Jul 2010 Location: Augusta, GA	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

1st November 2010, 12:19 AM	#4
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I always use metal cases for my audio so it acts as a screen. It should always been earthed. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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31st October 2010, 11:14 PM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Grounding the body of the pot/switch should fix it up.

31st October 2010, 11:18 PM	#3
parb diyAudio Member Join Date: Dec 2009 Location: Asia and United States	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.

1st November 2010, 01:15 AM	#5
CarbonCrew diyAudio Member Join Date: Jul 2010 Location: Augusta, GA	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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