This 1000: 1 voltage-controlled filter circuit was found in an Electronics Today International in a 1980s edition. The circuit is based on components of the time.
The old computers like the MSX of the 80's had the programs recorded on cassette tapes in the form...
This circuit drive an LED with constant current determined by the values of the resistors of 10...
This simple experimental circuit drives LEDs in sequence. Only transistors are used, and the power...