This simple 6 V source stabilized by zener diode was found in a European technical publication from 1972, but it is current for its simplicity and the components it uses.
This filter for interference generated by motors via the power grid was found in the June 1972...
This photometer with bargraph indication by LEDs was obtained in a publication in 1997. The sensor...
This circuit is designed to force a current greater than that of the fuse onto the transistor in...