SCR crowbar (CB8481E)

Found in a 90s American documentation, this circuit trips when there is an overvoltage at its output. The SCR can be any general purpose.

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Wien Oscillator MOSFET Stabilized (CB12452E)
This oscillator has the output sine waveforms stabilized by a MOSFET. Equivalent types can be...
Synchrodyne Receiver (CB24243E)
We found this synchrodyne receiver for the medium or short-wave band in the Radio Electronics...
2.3 W amplifier (CB15905E)
This amplifier is suggested by Sanyo, for radio and recorder applications and makes use of a...