Found in a 1990 PE Hobbyst, this 4-digit circuit has a high response speed. The circuit is based on TTL logic.
This circuit has a logarithmic response as a function of the light falling on the sensor. The...
This circuit was found in documentation from the 70s. The transistors are from that time, but the...
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...