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Old 31st March 2005, 02:17 AM   #1
Bose(o) is offline Bose(o)  Canada
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Default Op amp trouble shooting

Alright, I'm on my last threads for troubleshooting my attempt at the CMoy amplifier. I decided to build the amplifier first on my breadboard to no avail.

I got little sound, if I got any sound it was clicking and popping, removing the DC blocking parts (cap and resistor) removed this problem. However, I still didn't get sound....whisper quiet sound is good if you want to attenuate, but the idea behind this amplifier was to amplify.

I am still at a loss and am VERY frustrated, I have every piece of electrical test equipment at my very hands. My split power supply is PERFECT, only problem is the op-amp. Even using the op-amp as a Voltage Follower doesn't fix anything.

I've tried using different breadboards yet nothing still. I've bought new batteries 3 times already and still nothing.

Right now, I officially hate op amps.

I can get audio on the -'ve voltage rail, and I'm not even sure how, but there's more audio there than from the output.

TIA
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Old 31st March 2005, 02:50 AM   #2
Bose(o) is offline Bose(o)  Canada
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Oh yes, I'm using the Burr Brown OPA134PA.
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Old 31st March 2005, 03:07 AM   #3
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schematic?

I_F
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Old 31st March 2005, 03:22 AM   #4
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Are you using one or two OPA134PA?
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Old 31st March 2005, 03:52 AM   #5
Bose(o) is offline Bose(o)  Canada
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I can't get a schematic thus far, because the website is down BUT I have hooked up the amplifier via unity-gain and she no work.
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Old 31st March 2005, 04:13 AM   #6
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"Are you using one or two OPA134PA?"

...still a quite pertinent question...
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Old 31st March 2005, 05:56 AM   #7
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Are you sure the connections are correct? This bit me when I started out with opamps - I'd wired the circuit board perfectly well if the opamp would have been plugged in upside down. Ooops.


Francois.
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Old 31st March 2005, 06:50 AM   #8
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Default Re: Op amp trouble shooting

Quote:
Originally posted by Bose(o)
Right now, I officially hate op amps.
A CMOY is very easy to get working but since you are a newbeginner it's essential to have a schematic at least.

Headwize will be up 1st April. If you meanwhile can draw the schematic or at least take a picture we maybe can help you.
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Old 1st April 2005, 06:32 PM   #9
Bose(o) is offline Bose(o)  Canada
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That's the thing, I'm only n00b at op-amps, it's sad really.

Anyway, I'm using one OPA134 right now, amplifying just one channel (left or right, no diff.)
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Old 1st April 2005, 06:33 PM   #10
Bose(o) is offline Bose(o)  Canada
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Power Supply
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