4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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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)
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