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.
This circuit is based on the bistable configuration, but with the difference that the values of...
This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741...
The configuration shown in the figure is one of the most traditional when it is desired to produce...