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电话振铃指示灯设计

Lamborghini
工程师
2011-03-11 15:04:15     打赏
电路图


零件：
C1 0.47uF 250V Capacitor
R1, R2 10K 1/4 W Resistor
R3 1K 1/4W Resistor
D1, D2 20V 1/4W Zener Diode
D3 1N4148 Diode
Q1 2N3904 NPN Transistor or 2N2222
U1 4N27 Opto Isolator
RELAY Solid State Or Regular Relay (See Notes)
MISC Case, Wire, Board
注释
1. You may need to use a lower voltage zener for D1 and D2.
2. Be very sure that you have not accidentally connected 120V to the phone line when building and installing this circuit.
3. You can use a regular relay instead of a solid state relay, but the arcing accross the contacts may destroy it pretty quickly.
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