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this is my HERF : a MOT 1300W + a HV diode+ a capacitor 1uF2000V+ a HV switch+ a magnetron 800W + a cantenna
when I plug on 230Vac i experiment my HERF with a good result :) i kill a small calculator :) i can ear distinctly the filament activity : ( a special song : " KRRKKrrKKKRrrr " )
now i try to make a more "portable" version, so i connect on it a power inverter 600W, 1500W peek (during 5sec) + GOOD battery 12v 18ah(HR)/20HR (instant current5.4A max)
I have a lot of EMP charge with this battery, but i can see that i have not enough instant power to kill electronic devices, at least i can jam, or reboot the targets and i ear not really distinctly the filament activity ( just a little "k-rr-k-rr" ) I read on 4HV that it's normal, when we use a battery, we need a more long time for a really hot filament : so i plug 8-10 sec the filament, and when the filament is hot, i switch On the HV part and i generate the HV pulse...
and with all that, i can just reboot or jam the electronics devices (
now i think : i think that i have enough power for the HV part, but, i have a problem with the filament : so now i try to use an other power supply for the filament : actually , my battery 12v dc ->(across power inverter)-> 220v ac ->(across MOT)-> 3v ac : well, maybe i lost lot of power with this circuit : maybe i can find a better solution ??
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
For 12V supply you should use High frequency SMPS supply, generating 4kV instantly and lots of current, too. Using bridge of IGBTs and handwound 'flyback' or even better solid state MOT you could have very good results, no huge inverter, mot and capacitor, you could put everything in small box togeter with magnetron and almost carry it in hand.
For filament supply directly from battery best idea is to use PWM regulator directly from battery (something simple & low cost, maybe NE555 + few 2N3055s or so) and adjust duty cycle to about 1/4. There are also some chopper ICs avialable (like STR20** series), these are actualy buck converters and generate fine stabilised output that usually needs to be amplified by mosfet for more current...
hi ! i try to use a car battery 12v 35ha : 3000W/s peek connect with my power inverter
same result : not enough instant power....!!!!?? well... maybe it's my power inverter : not enough powerful ???? (1500wpeek) :/ maybe the filament is not enough hot when i use this (powerful !!) battery ?? maybe.... :/
if I connect a capacitor 3v + a switch (off) between the MOT and the filament of the magnetron, i can use the MOT (connect to the power inverter+battery) to charge the capacitor after I switch "on" and the capacitor discharges in the filament
simple, no ? you think that it's a good idea ? :)
but i don't find nowhere a 3v ac capacitor (min 5v) : it doesn't exist ? :( and i will need a powerfull capacitor....
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filament power supply problem ?
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