This modulator circuit for low intensity signals is from old documentation. The integrated circuit used is uncommon today. The circuit operates with signals up to 2MHz.
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...