Short Circuits Two Project - Countdown Timer Surge Protection transistors & resistors

transistors & resistors

Surf the internet and check emails on the longer-range 2

• Line-interactive UPS Topology • Phone/Fax/Modem/DSL/Network Protection

ready for use indoors

Multi-user MiMo

Short Circuits Two Project - Countdown Timer Surge Protection transistors & resistorsThis neat project enables you to dial a time you want to elapse before you want something to happen, say the exposure of a camera shutter or an electrically operated door to stay open. At the end of the timed period (seconds to many minutes) a relay is energized which can switch something on or off. PCB and all parts supplied, including relay. Requires 9V battery. Instructions sold separately or withing the Short Circuits book range, Short Circuits