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Tangent cMoy amp is very quiet

post #1 of 10
Thread Starter 
Hi everyone! I just completed making the cMoy amp according to Tangents tutorial. I went to play music and realized that it is extremely quiet. I can barely hear it at the highest volume. I don't know what's wrong with it. I checked all of the connection and they seem fine
I know it's not the cleanest soldering job but it doesn't have any bridges. I even switched out the chip. Should I just start over or is there still hope?
post #2 of 10

If you can hear sound then you've probably connected everything up correctly. You could have inappropriate values though.

 

Tell us the type of phones and the source. Is the volume acceptable driving the phones directly from the source if this is possible?

 

w

post #3 of 10
Thread Starter 
I'm just using some cheap Sony X something something. It doesn't take much to drive them. The power source is my iphone 5S and the OPA2132PA . I don't necessarily know what you mean in your last sentence but the volume is controled by the phone and a radioshack pot
post #4 of 10
Quote:
Originally Posted by recordbreakor View Post

I know it's not the cleanest soldering job but it doesn't have any bridges.

 

I see carbonized flux. That's a conductive path. If this is the problem, cleaning the board can fix it.

 

What I don't see is the top-side picture or the measurement results I asked you for via email.

 

Quote:
Originally Posted by wakibaki View Post
 

If you can hear sound then you've probably connected everything up correctly.

 

Not necessarily. The weak virtual ground in the CMoy can be "bounced" by the source, conveying tiny amounts of sound to the output.

 

Quote:
Originally Posted by recordbreakor View Post

The power source is my iphone 5S

 

That's your audio source only, surely.

 

But it brings up a good question: what are you using to power the amplifier?


Edited by tangent - 10/2/13 at 3:40pm
post #5 of 10
Thread Starter 


I am using a single 9v battery to power it.
Also, I am sorry but I can't get any measurement results right now because my Multimeter it broken
post #6 of 10
Thread Starter 
But I will try cleaning my board
post #7 of 10
Thread Starter 
Quote:
Originally Posted by tangent View Post

I see carbonized flux. That's a conductive path. If this is the problem, cleaning the board can fix it.

What I don't see is the top-side picture or the measurement results I asked you for via email.


Not necessarily. The weak virtual ground in the CMoy can be "bounced" by the source, conveying tiny amounts of sound to the output.


That's your audio source only, surely.

But it brings up a good question: what are you using to power the amplifier?

Also, if the flux was conductive, and I powered up the amp, do you think I shorted out anything?
post #8 of 10
Quote:
Originally Posted by recordbreakor View Post


Also, if the flux was conductive, and I powered up the amp, do you think I shorted out anything?

 

If the flux was conductive, and you powered up the amp, you certainly shorted something out. 

 

Get a new multimeter so you can diagnose your own problems. 

post #9 of 10
Quote:
Originally Posted by recordbreakor View Post

I am using a single 9v battery to power it.


Well, there's one problem for certain: you've got both C1 caps oriented the same direction. Re-read the second paragraph of Stage 1 in the assembly instructions.

 

The backwards cap should be replaced. It's probably damaged.

 

You might also consider using the virtual ground strips on the board to connect those green wires together, instead of using a free-floating solder blob. You're less likely to accidentally short something out that way.

 

Quote:
I can't get any measurement results right now because my Multimeter it broken 

 

Well, maybe you have only one problem with this build, and I have found it. If there's more than one problem, the lack of a meter means you'll just be guessing about it. And without that measurement data, you'll be asking us to guess about your guesses.


Edited by tangent - 10/4/13 at 4:26am
post #10 of 10
Thread Starter 
Thanks so much!!! I'll be away from my house for about a week, but as soon as I get back ill try what you said and tell you how it goes. Again, thank you!!
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