Phone Light Flasher

Published:2013/7/25 20:57:00 Author:muriel | Keyword: Phone Light Flasher | From:SeekIC

Parts:C1 0.47uF 250V CapacitorR1, R2 10K 1/4 W ResistorR3 1K 1/4W ResistorD1, D2 20V 1/4W Zener DiodeD3 1N4148 DiodeQ1 2N3904 NPN Transistor or 2N2222U1 4N27 Opto IsolatorRELAY Solid State Or Regular Relay (See Notes)MISC Case, Wire, Board Notes:1. You may need to use a lower voltage zener for D1 and D2.2. You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.3. Be very sure that you have not accidentally connected 120V to the phone line when building and installing this circuit.



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