Reflex receiver (CB8491E)

This circuit was found in a 1968 Hughes documentation. The transistors are from that time. The coil is for the medium or short-wave range.

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1 kHz Tuned Filter 741 (CB19118E)
The gain of this circuit at 1 kHz [and 40 dB falling rapidly when the frequency deviates from this...
5-step sequential circuit with 4 LEDs 4017 (CB25435E)
This circuit has the effects indicated in the table next to the diagram. We found it in the Radio...
60 Hz Receiver (CB24280E)
This ultra-low frequency receiver circuit was published in the August 1973 issue of Radio...