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I have a Kingbright, L-796BSRC-B SUPER BRIGHT RED blinking LED with built in IC. Having just installed a new home wireless alarm system which has a battery powered external sounder, I wanted to connect the existing 12v supply of the old, redundant wired in box to this LED to run as a permanent indicator. I did and it's working fine but blinking rather too quickly. Can I simply slow down the blinking rate from obviously outside the IC?

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Googling "Kingbright L-796BSRC-B datasheet" finds the datasheet for this device. On page 2 it shows that \$f\$ is 1.5 to 3Hz for a voltage of 3.5v to 14v, and the graph on page 3 shows that the rate decreases with voltage. So increase the applied voltage, and the rate will slow.

But you won't get much change by moving from 12V to 14V, so it's time to pick a different LED.

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