This circuit was found in an English magazine from 1977. Signal inputs and outputs must be shielded, and the circuit can be powered by battery, since its consumption is low.
This circuit was obtained from a European magazine of the 1990s. The integrated circuit used is...
Using a ceramic resonator, it is possible to vary the frequency between 4.9 MHz and 5 MHz. The...
In the figure we have the way to obtain a monostable action by lighting an LED for a certain time...