MOSFET Amplifier Stage (CB26315E)

Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the impedance of the speaker being driven.

| Clique na imagem para ampliar |

RF Switch with Varactor Diodes (CB24707E)
Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found...
Unit Gain MOSFET Amplifier (CB6128E)
This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is...
Pulse Counter (CB24087E)
This circuit digitally counts input pulses. The circuit from a November 1970 Radio Electronics uses...