Dual Tuning Reflex Receiver (T1564E)

This circuit was found in a 1924 Gernsback publication. The variable capacitors are dual. Listening is through a high-impedance phone.

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Automatic Voltage Regulator (CB26212E)
We found this circuit in the 1990 Radio Electronics Special Projects magazine. The circuit has a...
Dual Conversion Receiver Oscillator (CB20273E)
This circuit generates a signal for double conversion receivers. The signal has the frequency...
200 mV voltmeter with ICL7106 or ICL7107 (CB15354E)
In the figure we have the configuration of a 200mV digital voltmeter (LED or LCD) using Intersil's...