This circuit was found in documentation from the 1970s. The transistor supports modern equivalents. L1 with C4 determines the frequency range of the signals that will be produced.
Found in a 90s documentation, this circuit triggers the SCR when there is an overvoltage in order...
The presented circuit makes use of operational ones that are not common in the market. More modern...
In the figure we have a monostable that is activated with switch S1 and pressed for an instant. The...