Hi all! I'm in a spot of bother...
Continuing from this thread, I had decided to have a go at building Audioguru's mic preamp.
I planned to build two of them on one board to have stereo. However, I'm having trouble with both of them, so I must be doing something fundamentally wrong.
I've attached both of my attempts. I've gone over them several times and can't see any errors. They both respond in exactly the same manner, giving only a slight 'click' when the mic is connected, after which there's absolutely nothing, not even any noise. Putting an already amplified signal through it results in just the high frequency sounds coming through very quietly (I've attached it directly to a loudspeaker for testing).
The only ideas I have are...
Heat damage (but not to the chip; I used sockets).
The TL071CN chip (which is the one I'm using) is majorly different from the TL071.
I've done something wrong in both (which wouldn't surprise me!).
Being no expert I don't know how to proceed, and any help would be very much appreciated.
Continuing from this thread, I had decided to have a go at building Audioguru's mic preamp.
I planned to build two of them on one board to have stereo. However, I'm having trouble with both of them, so I must be doing something fundamentally wrong.
I've attached both of my attempts. I've gone over them several times and can't see any errors. They both respond in exactly the same manner, giving only a slight 'click' when the mic is connected, after which there's absolutely nothing, not even any noise. Putting an already amplified signal through it results in just the high frequency sounds coming through very quietly (I've attached it directly to a loudspeaker for testing).
The only ideas I have are...
Heat damage (but not to the chip; I used sockets).
The TL071CN chip (which is the one I'm using) is majorly different from the TL071.
I've done something wrong in both (which wouldn't surprise me!).
Being no expert I don't know how to proceed, and any help would be very much appreciated.