For the next step of my homebrew direct conversion receiver is the audio amp. I used this schematic from N6QW’s Simpleceiver posts.
Here is the amp mocked up on a breadboard.
It worked, but not very well. There was a lot of noise and static. At this point, I thought about switching over to a LM386 based amp, but I went ahead and soldered it up on a piece of copper clad.
I used a dremel and an engraver tip to rough out a few squares. This is the first time I’ve put together a circuit on bare copper clad. Next time I’ll plan the placement a little better. I cut out a few squares that I didn’t end up using and I probably could have shrank the footprint down quite a bit for a more compact board.
Here is the board all soldered up. It sounds much better. I hooked it up to the kiddo’s tablet and recorded a little video of it working.