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The phone flasher

2017-02-05 20:02  
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The phone flasher
E.g 14 the phone flasherThe phone ring voltage makes the Neon bulb conducting, and the photocoupler U triggers SCR conducting and the bulb is glowing, see as Figure 20-14. The frequency of the ring voltage is often at 20Hz or so, and the bulb is flashing at the frequency. The the load is the bulb, C1 will be useless. If the ring or the relay, etc, are the load, C1 is used to remove the sparkle disturbance.