This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital signals. The circuit can be used as a shield. FET can be a modern equivalent.
September 2017 - Microchip is making available through Mouser Electronics the ARM Cortex® M +...
This precision circuit can provide timings from 0.2 milliseconds to 3 minutes accurately. The...
This circuit for a simple alarm system was suggested in an article in Electronics Now magazine. The...