Transformerless 8 W Amplifier (T132E)

This interesting configuration found in a 1950s documentation is characterized by not using transformers, except in the power supply.

Positive Voltage Regulator (CB5461E)
The integrated circuit used in this regulator is not very common today. The circuit is from old...
Logic Probe (CIR4544E)
We found this circuit in an English magazine from 1980. The circuit can be easily assembled even...
Monostable Using the 4098 [IV] (CB140E)
A fourth version of a non-retriggerable monostable is shown in Figure. It is triggered by the...