Reply to "Building Flasher Circuit"

Dale ManquenOGR Forum Member MEMORIALIZED MEMBER

I don't like this circuit! It would be better to have the 270 ohm resistor, LED and transistor all in series so that the LED is turned ON by the transistor. As it is, the transistor must turn OFF the LED by shunting current away from the LED. As shown, there would be 33 mA and .3 watts of dissipation in the resistor when the LED is OFF. This problem will get much worse if you have multiple LEDs in series since the resistor will have a much smaller value, greatly increasing the current in the transistor when it is shunting the current away from the LEDs.

8/9/129:37 PM

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