I finally completed the board and already soldered all the parts. Upon testing, the IRF640 is getting hot. I just want to ask if this is normal.
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Originally posted by hisoka147 View PostI finally completed the board and already soldered all the parts. Upon testing, the IRF640 is getting hot. I just want to ask if this is normal.
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Originally posted by hisoka147 View Post
I'm trying to avoid touching this component because I experienced some electric shock on it.
http://www.littlemountainsmudge.com/zapperrevisions.htm
http://www.toolsforhealing.com/Produ...isaZapper.html
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Originally posted by hisoka147 View PostI finally completed the board and already soldered all the parts. Upon testing, the IRF640 is getting hot. I just want to ask if this is normal.
It should Not get Hot at all.
Unlikely Even Warm!
AVERAGE Current Flow is Less that 100 mA. on that 18 Amp Mosfet.
Working or Not, Sounds like you have a Problem!
Check Input Current. Should be Less than 150 mA.
Gary
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Hi all
I am also building Gary's Pulse 1 and am experiencing a very hot irf640, too hot to touch - any further thoughts on why ?
my unit is yet to work though
I have checked datasheet of irf640 and pinouts are the same so problem must lie elsewhere
Anyone got a good explanation of schematic ?
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hi
are you using the the reg111 on the bord or the lm1117 as a high curent transistor regulator
if you are using the second one the big transistor type the irf will make some het and you can reduse that by ataching some matal or i prefer alaminium stripp on the irf
if this is not the problem it migt be that the reg is not working well you know there is a short and a cutt of and the open situwation it might be opened that mean that the full power is entering to the pcb
you have to check the resistors they can be functioning wrong espesialy the resistors that are neer to the irf
tc
danny
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Originally posted by marburg View PostHi was having same problem on silverdog pi but was using small 100mm coil once i made 250mm coil and fitted it to the board it was fine picking up 2p coin at 200mm but only 80-100mm for 1gram of gold
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