8th April 2012 05:00 AM
Normally On Blinking Light Bulb From 555 Timer Circuit
Iím designing a circuit that will use a 555 timer to blink a light bulb. However, the bulb needs to be normally on and will blink only after the timer starts oscillating. The light bulb load will be 12VDC at ~5A.
Attached is a schematic of a circuit that I built using a N-channel enhancement mode MOSFET. The design works great with an LED. However, once I replace the LED with an incandescent light, the bulb stays dark. Does anybody have suggested changes to this circuit that will make a bulb like an automotive taillight blink?
Thanks for your help!
8th April 2012 05:16 AM
Where did you put the globe?
8th April 2012 05:25 AM
8th April 2012 05:32 AM
It must go in place of the resistor.
8th April 2012 05:42 AM
Thanks for the suggestion. The globe now blinks, but it is normally off. I need it to be normally on.
8th April 2012 06:16 AM
Try the first circuit. Obviously use the correct value components.
Last edited by colin55; 8th April 2012 at 06:18 AM.
8th April 2012 06:35 AM
Will do...does the globe stay, as you previously suggested, on the drain side of the MOSFET?
8th April 2012 06:52 AM
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