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Old 6th April 2009, 03:05 PM   #1
winner is offline winner  India
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Default how to reduce humming in guitar amplifier

i made a guitar amp usin tl072 as preamp and tda2050 as power it hums and buzzes annoyingly but they are reduced wenever i touch the circuit ground. plz help also, y r circuit grounds connected to chassis of the amp? do they help 2 reduce noise?
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Old 6th April 2009, 07:23 PM   #2
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And electric shocks. Might be radio interference, try angling the amp in different directions (sounds silly but you'll notice a difference if it does)
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Old 6th April 2009, 07:45 PM   #3
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Are your input jacks grounded (ie shorting-type, which connects signal ground to input- we are not necessarily talking about grounded chassis here, though that is common) ?
Is the buzzing present when the guitar is not plugged in and the input is shorted?
Answer: Yes- problem is in the amp.
Answer: No- problem is noise pickup from guitar/cable.

Just a point: You will likely get more responses if you use 'normal English' rather than 'texting' abbreviations in your posts. Some 'old fogeys' -like me- find it irritating to read......

Cheers
John
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Old 8th April 2009, 05:40 AM   #4
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Make sure you have properly shielded guitar cables.

Also check what else is plugged in to the same power adapter or in the house. Sometimes high voltage gear in a house can cause unusual hums to be heard through loud speakers at loud volumes Click the image to open in full size.
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Old 9th April 2009, 08:05 AM   #5
winner is offline winner  India
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theres no problem when the input is shorted but when the input is left floating( without connecting either to guitar and ground ) the hum is multifold .also is there any noise reduction
when the preamp is in inverting mode than in non inverting mode?
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Old 9th April 2009, 09:29 AM   #6
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Quote:
Originally posted by winner
theres no problem when the input is shorted
I'd say your amp sounds quite typical of most guitar amps- they are quite high gain, so sensitive to noise.
I you plug in a properly set-up guitar, using a good cord, you should be OK.

John
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Old 10th April 2009, 12:17 AM   #7
Minion is offline Minion  Canada
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You might also consider shielding the cavity in your electric guitar which will help with noise and hum...
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Old 13th April 2009, 07:22 AM   #8
winner is offline winner  India
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will replacing tl072 with any other better quality preamp help? chips like opa 2134 are very hard to get here. is there a readily available good quality ic available for substitute of tl072/74 ?
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Old 13th April 2009, 12:08 PM   #9
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G'day,

Quote:
Originally posted by winner
will replacing tl072 with any other better quality preamp help? chips like opa 2134 are very hard to get here. is there a readily available good quality ic available for substitute of tl072/74 ?
TL072 is a gorgeous op amp for HiFi and absolutely spectacular for guitar in my experience.

I think Test Electrix might have been on to something with "Might be radio interference". Any device pushed into saturation, transistor, opamp or tube, will hum like a son-of-a.

First thing I'd look at is grounding. I use a single point ground, even on my guitar amps.

Cheers!
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Old 13th April 2009, 01:11 PM   #10
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Quote:
Originally posted by winner
will replacing tl072 with any other better quality preamp help? chips like opa 2134 are very hard to get here. is there a readily available good quality ic available for substitute of tl072/74 ?

I agree totally with Geek, the TL072 is a great opamp, I doubt you would hear any difference whatsoever - and certainly not in a guitar amp.
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