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skipg Posted - Mar 21 2007 : 11:43:31 AM
I would like to know how I could modify the Ringing Phone Light Flasher circuit to turn off the light when the phone rings. My first thought was to find a Normally Closed (NC) SPST solid state relay, but Digikey only carries the NO flavor.

Thanks,
Skip
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skipg Posted - Mar 23 2007 : 01:45:13 AM
Thank you very much!

I'm thinking a further enhancement might be to add a DPDT switch: one side includes the inverter, the other side does not. The switch would then be used as the off/on switch for the light.

There's a commercial product available that does this: the Alertmaster AM-100. It also includes a wireless doorbell.

Since the cost of the transistor and resistor are about 20 cents, you might consider making this part of the published circuit...
audioguru Posted - Mar 21 2007 : 10:33:31 PM
Add another transistor and a resistor as an inverter like this:

Download Attachment: pflash.PNG
10.42 KB

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