Complex reflex receiver (T1663E)

Found in documentation from 1924, this 4-tube circuit has a heterodyne amplifier, as it was called.

| Clique na imagem para ampliar |

FET Voltmeter (CB12015E)
This circuit is characterized by high input resistance. The measurement accuracy will depend on...
MA1026 Portable Digital Clock and Thermometer (CB24684E)
This is the battery-powered version of the previous circuit. The circuit is from the same Radio...
49 MHz Receiver (CB18072E)
Signals from old cordless phones can be picked up with this circuit. L1 has 10 to 20 turns of 32...