Like the previous circuits, this one uses a small speaker as a microphone and has two amplification stages with 600-ohm output.
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
April 11, 2016 - Mouser Electronics, Inc. is pleased to announce the availability of the new...
This circuit allows to activate a relay in a biestable way using a 555. The pressure switches arm and...