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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
crazy4 wrote ...
i never burned the mosfet i only fried 555 timers because i never used a gate resistor until a few weeks ago when i learned a little more about mosfets
The resistor probably reduces spiking of the supply voltage so the 555 survives better. It seems to me that you have bad filtering for the 555. Do you use a voltage regulator with film (0.1uF) and electrolytic (~10uF) caps on both input and output? If not, try it.
The 555 should run fine down to ~5 ohms gate resistor, but I have never blown one with no resistor at all. You only need to filter and decouple the supply voltage well.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
crazy4 wrote ...
I use the 5v on a computer psu
5V to the 555?? This is not enough to turn on a MOSFET (are you driving it?), at least 12V should be used.
However, if you use a bipolar transistor, then the thing about the gate resistor is true, you need to use one, and it is better to use lower voltage for the 555...
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Problems with 555 Flyback Driver and Flyback Driver Discussion
