Transformerless 8 W Amplifier (T132E)

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

Operational Amplifiers Test (CB1500E )
We found this circuit in a 1977 publication. With it we can test general purpose operational...
Simple Lamp Flasher (CB481)
Lamps in the range between 20 and 50 mA can be used. Voltage supply is according the lamp and...
Low Frequency Stable Oscillator (CB5130E)
This 100 kHz crystal controlled oscillator was found in an American 1980s documentation. The...