Discrete Component 555 Timer

Explore the inner workings of a discrete component recreation by Shaun Jones of the well known 555 Timer IC. The original, designed by Hans R. Camenzind in 1971, is used all over the world and has sold in its billions.
The module uses 2N3904 and 2N3906 transistors with a variety of resistor values to replicate the function of the individual stages of the 555, allowing you to probe the changing voltages, and gain insight into how the internal circuitry operates.

Header pins can be fitted to the pin locations along the edges of the board to allow the use of jumper leads. The board also features a tab where 2 x 4-pin headers can be fitted to allow plugging into a breadboard. The pin arrangement is the same as on the IC.


Header pins are provided for fitting if required.

The boards should be powered from a 5v - 12v DC source.
Output current from pin 3 should be limited to 100mA max.

It should be noted that these boards are designed to be used for hobbyist and educational use only.