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?
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)
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
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
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
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
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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?
when the preamp is in inverting mode than in non inverting mode?
winner said:
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
You might also consider shielding the cavity in your electric guitar which will help with noise and hum...
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 ?
G'day,
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!
winner said:
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!
winner said:
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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