This modulated transmitter for a light beam communication system was found in the 1991 Electronics Experimenter Handbook. The circuit modulates a LASER diode.
This signal follower, from a publication from the 1970s, uses old germanium transistors such as...
This sophisticated photometer that has a light comparator with LED indicator came out in an...
The presented circuit is used to test ordinary fluorescent lamps. This circuit also has a mains...