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 |

Bidirectional Current Sensor (CB5257E)
This circuit was found in a 2005 Linear Technology manual. It senses the two-way current,...
Amplifier for radon monitor (CB21202E)
This circuit was found in an Electronics Now from the 90's. See the previous article for the...
TTL Monostable (CB19381E)
This is the basic configuration of a monostable TTL with the 74121. The trip is done with an NC...