This circuit is from a 1980s Motorola documentation. The circuit can be made with modern equivalent components. The original circuit is for the 115 Vac (110 V) grid and has two settings.
This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...
In the figure we have the way to obtain an adjustable 1 to 10 mAconstant current source. The...
We found this circuit in an 80's Radio Electronics. The circuit uses a PTC sensor and an LED...