Thread: 250mW LASER stuck on
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11-07-2009 #2
Last Activity: 17-03-2017
Keith,
To switch a FET on the gate voltage needs to rise above the sink by at least 1 or 2 volts or so, but no more than the Vgs(max) parameter of the device but a lesser known fact is that at very low drain-source currents (<0.2A) it can turn on sufficiently at a gate voltage as little as 1v.
It would help to know what FET you are using but if you are using devices such as the IRL520N you may find you can't turn the FET off sufficiently.
The attached shows a circuit that should work...
regards,
Irving...Last edited by irving2008; 11-07-2009 at 07:18 PM.
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