Opampia Revisited

OpAmpia: The Op-Amp Receiver

Opampia Receiver Board


I have build 4 receivers in as many weeks, none of them anything i would write home to mum about. They all worked, some better than others, but they have all been rubbish in one way or another.

This is OPAMPIA, something i started a while back but put in the too hard basket when I did not have a reasonable audio amp to use with it, the problem is that its got a sore tooth, and I am not sure why yet. The output of the opamps look nice, but the audio out the final mixer has a bad dose of pythagorus’s theorem. I am going to knock some gain out of the IF amps and see if that helps. I think one of the IF amps is being slew limited and hence this horrible output.

I think this receiver could actually be quite ok once i sort out the awful sounding audio. The signal in the video is really strong and loud. The sender is about 1000km away, this was on 40m.