This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
This circuit was found in an old Radio Electronics, but can still be assembled as the components are...
This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer...
The integrated circuit used in this 80's temperature control is not very common today. The load...