30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Wien Bridge Oscillator CA3140 (CB9418E)
This circuit is from a 1978 publication, and the integrated diode bridge can be replaced by...
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Receiver for network remote control (CB25853E)
This is the receiver circuit for the remote control whose transmitter was given in the previous...