This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
In the figure we have the shot made by an interrupted light beam using a phototransistor or a...
This interesting radio circuit for listening on a crystal phone was found in a Japanese magazine in...
This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the...