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 |

Voltage doubler power supply (CB8166E)
Using a 12 V transformer, this unit can provide a much higher output voltage. The circuit is from a 90’s...
Precision analog multiplier (CB7393E)
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....
Multi-pulse trigger (CB21477E)
This circuit was found in a 1967 EEE. The transistors are from the time and can be tested...