carebare47
- Oct 21, 2010
- 66
- Joined
- Oct 21, 2010
- Messages
- 66
Hello,
I have recently build a flyback transformer driver consisting of a 555 timer (@12v) at about 25KHz driving four MOSFETs (IRF960) in parallel (MOSFETs aren't great, so I stuck four of them in parallel. It seemed to help a lot) which in turn drives a primary coil of a flyback transformer (The negative of the coil goes to minus 12v, so there is 24v across the coil). I can get sparks of about 4/5cm(ish). This is my transformer and driver working:
. I have also audio modulated it (from computer sound card) via a 10nF capacitor on pin 5 of the 555 (voltage control I think), but the arc is too small and thus too quiet. Anyone got any ideas of how I could increase the output of the flyback?
Many thanks,
Tom
EDIT: Also, the MOSFETs get quite hot (too hot to touch after about 30 seconds). I haven't ran it for more than a minute because I don't want to fry them. What is it exactly that causes the MOSFETs to heat up so much, and is there anything I can do about it? And what is it in the MOSFET that gives a large arc from the transformer? Voltage rating, amperage etc... Someone explaining that would help a lot also ^^
Thanks again
I have recently build a flyback transformer driver consisting of a 555 timer (@12v) at about 25KHz driving four MOSFETs (IRF960) in parallel (MOSFETs aren't great, so I stuck four of them in parallel. It seemed to help a lot) which in turn drives a primary coil of a flyback transformer (The negative of the coil goes to minus 12v, so there is 24v across the coil). I can get sparks of about 4/5cm(ish). This is my transformer and driver working:
Many thanks,
Tom
EDIT: Also, the MOSFETs get quite hot (too hot to touch after about 30 seconds). I haven't ran it for more than a minute because I don't want to fry them. What is it exactly that causes the MOSFETs to heat up so much, and is there anything I can do about it? And what is it in the MOSFET that gives a large arc from the transformer? Voltage rating, amperage etc... Someone explaining that would help a lot also ^^
Thanks again
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