This circuit was found in a 1975 documentation. Current general-purpose transistors can be used, and the power is supplied with relatively high voltage. The gain is 30 dB.
A small voltage-boosting transformer is used in this pulse generator circuit found in...
This circuit was found in a 1964 magazine, which no longer exists. It is a small wireless...
This circuit was found in a 1980 documentation. The triac used is of the TIC226D type which in the...