This high voltage circuit was found in a 1970 documentation. The integrated one is of the time and modern equivalents can be tested. The resistors of the voltage reducing system must be calculated.
We found this circuit for guitar training in an English documentation from 1989. The components are from...
This circuit produces a voltage drop in the first pulse, turning off the relay. On the second...
Readers who like sound or sound effects cannot fail to examine this interesting circuit. What we...