This kit is based on the extremely versatile 555 multi-purpose timer integrated circuit. This kit has been designed so that you may select either ASTABLE or MONOSTABLE modes of operation by simply populating the PCB with appropriate components included in the kit. Astable is "free-running" and is used for an audio oscillator or LED flasher configuration of this kit. Monostable is a "one-shot" and is used for a timer configuration of this kit. This kit will work with batteries or power source from 5VDC to 15VDC.

The control, reset, trigger, and output signals of the 555 are routed to pads on the PCB so that you can connect to them and expand the capabilities of this kit. This circuit is truly amazing with all the available options. Use it in prototyping your designs or even as a stand-alone module for your projects such as dark room timer, signal generator, flashing display, games, audio source, connect it to a relay (not included) to control higher voltages, etc.