How to Modify Greeting Card Sound PCB for Repeating Alarm with Battery Saving?

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#1 21662426 31 May 2012 21:16

Lynn Anderson Lynn Anderson

Anonymous

Post #1
21662426 31 May 2012 21:16

I'm interested in making a toy with the sound PCB and components from a greeting card. When the card is open, I would like to control the off time and have it repeat continually. I want to use it as an alarm but make the batteries last.
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#2 21662427 31 May 2012 22:24

Steve Lawson Steve Lawson

Anonymous

Post #2
21662427 31 May 2012 22:24

You could use a 555 timer to turn the card on and off or to act in place of the switch that activates the card when it's opened. Use a CMOS 555 for low drain and so you can use large resistors, so the capacitor won't have to be as large. You can use a tantalum cap, to get large capacitance in small size.

Or, you could use a CMOS 4060 which is an osc and 14 stage ripple counter that is perfectly suited to generating long time delays.
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How to Modify Greeting Card Sound PCB for Repeating Alarm with Battery Saving?

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