We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
The four NAND gates of a 4011 are used in the clocked R-S flip-flop shown here. The circuit is set and...
This circuit was found in a Popular Electronics of the 90s. The output amplitude will be between...
This traditional circuit of old documentation uses a 0-1 mA milliammeter and has several scales....