This 1974 circuit uses two 555 integrated circuits in a very traditional configuration. The circuit can be powered by voltages from 9 to 12 V and for greater volume an amplifier stage can be added.
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...