This circuit was obtained in old documentation, but it is valid for modern triacs that must be equipped with heat sink. The trigger element is an ordinary neon lamp.
This circuit was found in a 2000 Poptronics. The magazine no longer exists, but the circuit can be...
This 80's circuit has an input resistance of the order of 880 M and gain 10, using operational...
This circuit can be used in a toy organ. The frequencies are determined by the capacitors selected by...