RF Probe (T1691E)

This high-impedance probe for oscilloscopes was found in a July 1958 Radio Electronics magazine. The circuit did not include a power supply.

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Transmitter modulator (CB7492E)
This modulator circuit for AM transmitters was found in a 1960 Sylvania transistor manual. Modern...
Electronic Relay (CB504)
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
Logic Proof (CB21193E)
We find this circuit in an Electronics Now. The indication of the logic level is done on a...