This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are uncommon today. The circuit includes a gain selection switch.
E) This circuit was found in documentation from the 1980s. The integrated circuit used is not very...
The circuit shown in the figure makes it possible to trigger a load after times that can extend up to 4...
This circuit with operational amplifier was found in old American documentation. It can be...