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Simple LED Die with Slow Down Action

Denis Burchill

Circuit Diagram

[LEDcct.gif 7.7 kb]

How the circuit works

When the "throw" switch is pressed both the 100 nF capacitor and 4M7 resistor are connected to 0 volts. The capacitor immediately charges up to 9 volts and the BC557 transistor turns on which then enables the NE555 to oscillate.

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This page: created 30 October 2006, modified 25 September 2007.