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1x RS232/422/485)
outdoor-ready fixed mini dome with a flat-faced design that suppresses reflections
Soft and Silent Keys
297 x 432 mm
• Line-interactive UPS Topology • Phone/Fax/Modem/DSL/Network Protection
Short Circuits Two Project - Countdown Timer Surge Protection 1x RS232/422/485)This 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
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