This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
We adapt this circuit of Radio Electronics - March 1990. The magazine no more exists, but the...
This circuit is a digitally controlled variable capacitor. We found it in American documentation from...
In the circuit shown in the figure, when the input voltage rises to 27 V, the TL431 triggers the...