Exterminate! Experimenting with an SA602A

RE: Exterminate! Experimenting with an SA602A

dubbie — Thu, 05 Mar 2020 11:33:57 GMT

Jon,

This all looks good fun and interesting. I could just about follow most of what you were doing although I think the reality of the analogue electronics a bit beyond me. It all seems a bit like trickery. I think I must be more a digital designer.

Did it make any Dalek sounds?

Dubbie

RE: Exterminate! Experimenting with an SA602A

shabaz — Wed, 04 Mar 2020 23:51:58 GMT

Hi Jon,

Awesome work experimenting with the SA602 to accept a different frequency like this. It's nice to see how flexible these old chips are, to allow completely different projects that the manufacturer likely never expected : )

When I started reading, I was initially wondering about using a soundcard for the spectral analysis, but then saw you got great results with the 'scope's built-in FFT capabilities.

I tried experimenting a while ago with FM synthesis (it is written up here: Sound Synthesis and the Billion Dollar Paper ) and I found it interesting learning how if certain harmonics are pulled out of the 'comb' (this naturally occurs with certain combinations of modulation index, modulation and carrier frequencies) then the sound changed a lot. I did it the boring way using a PC however, I didn't think at the time to try it with a radio chip!

RE: Exterminate! Experimenting with an SA602A

genebren — Wed, 04 Mar 2020 23:24:20 GMT

Very cool experiment. This is interesting subject, tied together with a very nice blog.

Thanks for sharing!