Hi all, I'm about to build this detector/audio amp circuit.
I want to run it from batteries, I thought it was +/- 4.4v supply. I thought I was going to use 6 AA cells and center tap them,
but maybe not. I just noticed it looks like it's +12 and -4.4v. First, does that make sense? Or could it be an error in the presentation. See figure 2 and 1 for Power supply connections.
Any other thoughts about the circuit?