Found in the July 1970 Radio Electronics magazine, this circuit has an adjustable activation time that depends on capacitor C1. The SCR may be a 106 series equivalent.
Found in an EDN from the 90s, this circuit uses an electret microphone. The output can be used to...
This circuit is characterized by the configuration that accelerates the switching, being ideal for the...
This circuit makes use of a PLL 567 to invert the phase of a signal, ie to change it from 0 to 180...