muckleluck Posted May 30, 2005 Report Share Posted May 30, 2005 I need to build a light flasher to test brake lights in cars. The input voltage is 14V and the max current about 3A. The light needs to be powered for 30s-1min (adjustable whether by a switch or a pot doesn't matter) and then off for 30s-1 min. Anybody have any suggestions for a simple circuit that can meet these specifications?Muckleluck Quote Link to comment Share on other sites More sharing options...
muckleluck Posted May 30, 2005 Author Report Share Posted May 30, 2005 I decided to us an astable 555 timer circuit with a 1M ohm pot and a 100 microF cap to (hopefully) give me the correct timing range. What I can't figure out is which transistor to use to switch the current to the lamp. Does anyone have any suggestions? I might need to switch up to 8A. Am I on the right track with this or is there an easier way? Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted May 30, 2005 Report Share Posted May 30, 2005 I agree except I wouldn't bother with a relay I'd use a power MOSFET, the IRL540 would be perfect for this application. Quote Link to comment Share on other sites More sharing options...
muckleluck Posted May 30, 2005 Author Report Share Posted May 30, 2005 sweet. thanks for the help guys. Quote Link to comment Share on other sites More sharing options...
muckleluck Posted May 30, 2005 Author Report Share Posted May 30, 2005 Oh wait... so you mean I should use a transistor and a power mosfet or can I drive the mosfet directly with the timer output? Quote Link to comment Share on other sites More sharing options...
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