AFSK Tone Generator (CB4201E)

We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be implemented with equivalent modern components.

| Clique na imagem para ampliar |

LED Binary Counter (CB4345E)
This circuit came out in an American magazine that no longer exists. It's the Electronic...
Code Switch (CB10287E)
This circuit originally came out in a Budget Electronics from 1981. The American magazine no...
LM382 Preamplifier (CB15083E)
This is the traditional audio preamp configuration with the National Semiconductor LM382. The...