Cheap preamps

Thanks!

You are correct about how I need to leave the ring disconnected.

It would be nice if I could use a smaller pre-amp, so I looked for some.

I think this listing looks appropriate. (I have mono input.)

I had trouble finding a listing that discussed the electrical characteristics of the pre-amp, but I see that this other (stereo) board uses the PAM8403 chip, of which I found the datasheet. The attached table, from the datasheet, lists output voltages that look okay to me.

Maybe I’ll get both.

Does that sound right?