The 100Ω is there to prevent high-frequency oscillation in the NFET....So I would decrease that gate resistor from 100 ohms, if the 555 will bear the load. If you can drive the gate effectively, you may not need a heat sink at all on the MOSFET.
Fair enough. Is the waveform on the gate slowed to reduce ringing?The 100Ω is there to prevent high-frequency oscillation in the NFET.
More like to kill gain at MHz. Not all NFETs oscillate in a circuit like this, but putting between 10Ω and 250Ω there will stop the oscillation if it happens.Fair enough. Is the waveform on the gate slowed to reduce ringing?
Not just MOSFETs - they used to be called grid stoppers.More like to kill gain at MHz. Not all NFETs oscillate in a circuit like this, but putting between 10Ω and 250Ω there will stop the oscillation if it happens.
Most diodes only conduct one way, but there are exceptions - tunnel diodes and zeners spring to mind.edit: nvm, i just read 'Do u no wot the diodes do, or do u not ?' thread
/me tips hat at Rod, Mike and Ian for patience
and here's me thinking a diode was a one way valve. what could have i been thinking....
More than enough at 250Hz...How much gate charge can the 555 provide?