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 circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
In the figure we have more circuit that makes use of transistors and that has excellent...
This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in...