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 |

Light Control (CB22101E)
This circuit was found in documentation from the 90's. The load can be a relay and the sensor an...
Voltage tripler (MSB032)
The presented circuit is used in Power supply to increase the voltage output. The voltage output...
Tape preamplifier (CB7310E)
Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time,...