Op amp trouble shooting

Bose(o) · 31st March 2005, 01:17 AM

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

Bose(o) · 31st March 2005, 01:50 AM

Oh yes, I'm using the Burr Brown OPA134PA.

I_Forgot · 31st March 2005, 02:07 AM

schematic?

I_F

Russ White · 31st March 2005, 02:22 AM

Are you using one or two OPA134PA?

Bose(o) · 31st March 2005, 02:52 AM

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.

Fat Dave · 31st March 2005, 03:13 AM

"Are you using one or two OPA134PA?"

...still a quite pertinent question...

DSP_Geek · 31st March 2005, 04:56 AM

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.

peranders · 31st March 2005, 05:50 AM

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.

Bose(o) · 1st April 2005, 05:32 PM

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.)

Bose(o) · 1st April 2005, 05:33 PM

Power Supply

31st March 2005, 01:17 AM	#1
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	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 __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

31st March 2005, 01:50 AM	#2
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	Oh yes, I'm using the Burr Brown OPA134PA. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

31st March 2005, 02:52 AM	#5
Bose(o) diyAudio Member Join Date: Dec 2001 Location: Ottawa, Ontario, Canada	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. __________________ ERTW 4 life! "the day has 24hours. If that is not enough take the night."-Roemhild

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31st March 2005, 02:07 AM	#3
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	schematic? I_F

31st March 2005, 02:22 AM	#4
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	Are you using one or two OPA134PA?

31st March 2005, 03:13 AM	#6
Fat Dave diyAudio Member Join Date: Aug 2004 Location: Calgary, Canada	"Are you using one or two OPA134PA?" ...still a quite pertinent question...

31st March 2005, 04:56 AM	#7
DSP_Geek diyAudio Member Join Date: Aug 2003 Location: Santa Cruz, California	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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