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Capacitor charging circuit from a Mosquito zapper bat. Answered

Hi, I want to make a coil gun from a Mosquito zapper bat can any buddy tell me that how to make it from parts like 400 volt capacitors (normal or siliocon coated) , Mosquito zapper bat circuit ( Used it because it makek an output of something 2000 + or - volts @ something 2.1 volt input ) circuit digram i will upload soon ,etc. i want to operate it @ 1.5 volt. can anyone help me in doing it and find me following answers =
1) circuit for charging the capacitors bank safely with over charge protection ( with thermistor or something like it)
2) led based capacitor charged indicator (specifically single led based)
3) any other circuit by which i can make a capacitor charging circuit with input 9 volt battery and output 800 volt.
4) also any voltage amplification circuit with input 9 volt battery and output 800 volt.
5) please tell me which parts to use like diodes, transistors, LED diode, resistors, transformer, thermistor, etc.


Josehf Murchison

5 years ago

Start with something like this and tweek till it works.

Voltage Multiplier Negative.gifHigh Voltage.gifHigh Voltage basic.gifCoil Driver.png
manpatproJosehf Murchison

Reply 5 years ago

thanks nice i will try it also. by the way can you please explain me about the first image of those diods and capacitors and can you enlarge it with positive and negative input and output also.


5 years ago

Have you had a play with a camera flash, you can pick them up cheap, or buy a disposable camera with a flash. They output around 300-400 volts to fire the flash bulb.
Ive had a play with one and got a nasty shock and burn off it. I would think it would fry a mossy really well


Reply 5 years ago

Thanks bro. But i want to make it from a mosquito zapper bat. i am saying because in coil gun higher the voltage higher the power in coil. and cameras use 300-400v but mosquito zapper bat uses nearly 2000 volt which is so much high volts. and i am having 4 mosquito zapper bat circuits.


5 years ago

The basics are covered with the schems Joseph posted.
as a sidenote: I would go with the Coil-booster instead of the ladder-design.
The ladder is normally very low power...

But Joseph already created the complete circuit in the lowest schem he posted.

As a sidenote and hint:
It is very whise to think not only about switching the power ON with an SCR but also to cut it again at the right moment.
Why? If your coil is powered on and the projectile passes this coil, the megnetic force will try to catch it. Means: Forst the projectile gets accelerated towards the coil. After passing the center of the coil, the magnetic force still pulls on it thus decellerating it and ultimatively pulling it back and capturing it in the center of the coil.

However, since we use a SCR to fire the current and SCRs are selfconducting if fired, we need another means of power down the coil at the right moment.
A V-Switch made of 2 SCRs is perfect for that.
needs a much smaller second, equally charged cap to fore into the nodepoint of the SCR and the Coil while the primary SCR need to be on the high-side of the coil since the internal resistance of the coil is needed there.
See http://picload.org/image/agiicdp/v-switch.png for a quick (incomplete and simplified) schem of that part.
The SCR of the tank gets fired by the trigger of the gun. The stopper-SCR gets fired by a sensor (optical worked for me) which determines the moment (or a bit earlier) the projectile is in the center of the coil.
It needs to be a bit earlyer because the small stopper-cap will need to bleed out trough the coil.

How does a V-Switch work?
2 things have to be known:
1.: a SCR is a diode which does not conduct current in the blocking way.
2.: a SCR put itself out (stops conducting current) if the current flowing trough is lower than a certain minimum.
OK. Now lets see where when what voltages are.
First we charge both caps to the same voltage. The stopper can also be a bit higher than the tank but not the other way around.
Now we fire the tank with the first SCR. the voltage on the high side of the coil is the full voltage of the tank-cap.
Now as a few milisecs pass, the voltage lowers a bit (depending on the capacity of the tank, resistance of the coil and time passed).
Now a sensor (or timer) fires the second SCR (of the stopper-cap). This cap was still full!
He "injects" charge onto the coil and will raise the voltage on the high side of the coil a bit.
Now happens the interesting part! The first SCR now has a higher voltage on its cathode than on its anode. Since the SCR acts as a diode, no current will flow "upwards" to the tank-cap. Instead, the current in the first SCR simply stopps. And since the SCR reached his switch-off-current (low) he blocks himself, ready to be fired later on via the gate.
Now we switched OFF the tank at a time of our choosing! How cool is that!
But wait... There is still the stopper-cap playing music... And this one we cannot stop since we dont have another stopper-stopper-cap to fire into and so on...
We simply let the stopper-cap discharge trough the coil and let it switch off by himself if the cap is discharged.
Thats why the stopper should be much smalle r than the tank.
I once sucessfully made a small CG with a stopper of 1uF and a tank of 470uF.


5 years ago

I am also make a mosqito bat taser
Can I put 9volt battery in mosqito bat without any circuit damage.

Josehf Murchison

5 years ago

These are voltage multipliers you put AC voltage in and as the capacitors charge and discharge the voltage multiplies.

Positive or negative depends on whether the diodes are pointed towards the output or away from the output. Towards the output is positive away from the output is negative.

Match maximum voltage to diodes and capacitors, 1000 volts max to 1000 volt capacitors with 1000 volt diodes like: 1000 volt output to .01uF 1000v capacitors and 1N4007 diodes.


Voltage Multipliers.gif