riccardo
Member
Hi,
I made a 555 based PWM circuit but am having problems with it. It consists of a 555 timer and comparator which drives the gate pin of a MOSFET. My test load is 5x 5R wire wound resistors in parallel.
It operates ok but has some nasty ringing. I have also noticed that when I turn up the frequency (about 80kHz) the electrolyitic capacitor gets really hot.
This capacitor is just placed between power and ground. Why would it get so hot?
Cheers
I made a 555 based PWM circuit but am having problems with it. It consists of a 555 timer and comparator which drives the gate pin of a MOSFET. My test load is 5x 5R wire wound resistors in parallel.
It operates ok but has some nasty ringing. I have also noticed that when I turn up the frequency (about 80kHz) the electrolyitic capacitor gets really hot.
This capacitor is just placed between power and ground. Why would it get so hot?
Cheers