Found in an Electronic Design of 1964 this circuit has a control for the frequency and another for the active cycle the signal. The bipolar transistor can be a general-purpose type.
We can use high value electrolytic capacitors in alternating current circuits with the...
Using only one integrated circuit this control was found in an 80's Electronic Engineering. The circuit...
This source of constant current was obtained in an American documentation of 1973. The transistors can be...