Rev-limiter operation
Posted: Fri Oct 17, 2008 8:02 pm
Ok, let me get this straight;
normally the trigger is low (off) and the SMBT... does not conduct, making the gate -ve via the ground link.
then when trigger'd the SMBT conducts and the makes the gate +ve which stops the flow through the MOSFET.
is that correct?
i am trying to modify this arrangement so that the MOSFET is off when the trigger is off, then when there is a +5v signal the mosfet is turned on. but am encountering problems (probably in my choice of Mosfet (STD30PF03L) and transistor (FMMT491TA)
any help would be great,
Cheers,
David
normally the trigger is low (off) and the SMBT... does not conduct, making the gate -ve via the ground link.
then when trigger'd the SMBT conducts and the makes the gate +ve which stops the flow through the MOSFET.
is that correct?
i am trying to modify this arrangement so that the MOSFET is off when the trigger is off, then when there is a +5v signal the mosfet is turned on. but am encountering problems (probably in my choice of Mosfet (STD30PF03L) and transistor (FMMT491TA)
any help would be great,
Cheers,
David