This circuit, which can act as a shield, was found in a 1970s American documentation. The configuration can be applied to modern equivalent integrated circuits.
This circuit is from Signetics' 80s documentation. The circuit generates 100 kHz signals according...
This circuit was found in a Motorola documentation from the 90s. The transistor used is uncommon...
This two-tone buzzer can be powered by a solar panel. The circuit is from a 1991 documentation. The...