This circuit was found in a 90s Popular Electronics. The circuit operates in the range determined by L1. The integrated circuit used is uncommon today.
The circuit shown in the figure is a more sensitive version of the previous one (CB16105E). Two...
In the figure we have the way to obtain a monostable action by lighting an LED for a certain time...
This circuit was found in an American 1980s documentation. The transistors admit equivalents and the...