Pocket Tube Radio (T1621E)

This sensitive 4-tube, battery-powered receiver was found in a 1949 Radio Electronics. The circuitry was wired in crystal earphones.

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IR Modulated Transmitter (CB856E)
This circuit produces a IR beam with a frequency adjusted by the 100k pot. The circuit can be used in...
Voltage Controlled Current Source (CB910E)
The output current for this source depends on the voltage applied to the input. The operational...
Capacitance Measurement Bridge (CB4423E)
This simple measuring bridge allows the capacitance m of some pF to microfarads to be measured...