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.
This circuit is from an Italian magazine Radio Elettronica of January 1977. The circuit shows how...
This is one of the possible timer configurations with the 555. We found it in October 1986 Radio...
This circuit was found in a 1969 US documentation. It provides a signal that can be externally...