This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
We found this circuit in an English publication from 1980. It provides a logical output signal when...
This circuit was found in a 1980 documentation. The triac used is of the TIC226D type which in the...
The integrated circuit used is a dual 555 CMOS. The circuit is from an English documentation and...