Ringing Phone Light Flasher

Probleme, scheme si idei in comunicatii mobile.

Ringing Phone Light Flasher

Postby stress on 11 Dec 2008 14:04

I have received several emails asking how to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device.

Parts
Part Total Qty. Description Substitutions
C1 1 0.47uF 250V Capacitor
R1, R2 2 10K 1/4 W Resistor
R3 1 1K 1/4W Resistor
D1, D2 2 20V 1/4W Zener Diode
D3 1 1N4148 Diode
Q1 1 2N3904 NPN Transistor 2N2222
U1 1 4N27 Opto Isolator
RELAY 1 Solid State Or Regular Relay (See Notes)
MISC 1 Case, Wire, Board
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