can i charge a capacitor rater for 450v 680uf with a racquet shaped bug zapper's circuit.
Sure you can, safely, probably not. If you can mod the circuit to have an output voltage less than 450V, everything will be good and well. It will probaly take a while to charge up that big a capacitor, and you will probably need to remove the cascade multiplier on the output in favour of an HV diode, or a few 1N4007's in series.
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A:) Use a proper charging circuit, Otherwise...
B:) **Check your bug-zapper to see what the Stock Capacitor installed can handle. Do this only if you Really want to use the bug-zapper.
Like everyone else has said you can technically use it IF your bug-zapper's discharge voltage in less then the 450V your Cap is rated for.
PS: are you actually using the full 450 V? anything over 240 to me spells Tazer :P
That sounds like it might work, assuming the HV output of the racquet-shaped bug zapper is DC and less than 450 volts, and also assuming you get polarity matched correctly.
You can use a voltmeter to check the voltage output of your zapper, assuming you've got a voltmeter that won't be destroyed by the zapper.
Maybe that part is a little tricky? It's sort of like I'm asking you to know what the voltage is before you try to measure it.
I'm guessing those racquet style bug zappers do not produce more than 1000 VDC, which coincidentally is the upper limit on my cheap mulitmeter.
I think I've got one of those bug zapper racquets too. So if you cannot measure yours, for lack of equipment, or courage, or whatever, just write back, and I'll see if I can make a measurement for the voltage output, and maybe also the output resistance, of my bug zapper racquet.
1. The bug zapper will probable output more then 450 volts.
2. The current out put of the bug zapper will be very low a few mA at best - or you could kill someone with it. The charge time of the capacitor is connected to the current flow so it.s going to take a long time to get any where.
Practically speaking the answer is no.