1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

Didactic Comparator (CB1431E)
With this circuit, of a 1977 Radio Shack documentation, it is possible to demonstrate the...
Noise and rumble filter (CB6716E)
We found this circuit in a Philips documentation from 1969. It makes use of transistors of the...
Voltage tripler with the 555 II (CB1240E)
This traditional triplier configuration with the 555 can be found in other articles on the...