Charge Battery From Capasitor.

[slayer007]

I know this probley Is'nt right but I was just woundering something like this.
And where is a good place to find the neon bulbs?
the capasitor I'm using is 350v I would like to discharge it after about 200v.
do you know what size resistor I would need for that?

[Groundloop]

@slayer007,

You got it 100% wrong. 

Attached is a drawing of the SCR as seen from the front (labeled) side.

[EDIT]  Try any online electronic reseller for Neon bulbs. (Use Google).

For the resistor, use one resistor of 10K in series with a trimmer resistor of 100K.
Then just adjust the trimmer resistor for the voltage you want. Use a DVM to measure
the voltage over the capacitor.

[EDIT 2] How big ( in uF ) is your 350 Volt capacitor?

Groundloop.

[slayer007]

LOL I didnt think I was right.
Now am I on the right course?
And do you know what resistor I would need to have it dump around 200v.
I cant seem to find a good place for them neons eather I seen a couple on ebay but they dont say the voltage for them.
they were NOS GE NE-2 Neon bulbs

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=220211286372&ssPageName=STRK:MEWA:IT&ih=012

Thanks for all you help

[zerotensor]

I know this probley Is'nt right but I was just woundering something like this.
And where is a good place to find the neon bulbs?
the capasitor I'm using is 350v I would like to discharge it after about 200v.
do you know what size resistor I would need for that?

You could put multiple neon bulbs in series to raise the voltage threshold.  The bulbs I am familiar with are designed for operation at about 100V, but the tube will start to conduct at around 50V.  If you used bulbs with these characteristics, three or four of them in series should give you switching at about 200V.

The voltage rating on the capacitor is only one part of the equation.  Of equal or greater concern is its capacitance.  Typically, this sort of setup would call for a cap in the hundreds of uF (micro-Farads).  Remember, it's the amps that will fry you.  Voltage is only one part of the equation.

If your goal is simply to charge a battery, pulses at 200V might be overkill.  You can (and should) stay well below the capacitor's rated voltage in practice.  Watch out for sparks around lead-acid batteries, especially old and stressed ones.  Hydrogen gas can escape and cause a nasty acidic explosion.

Tell us,
What is the capacitance of your capacitor?
How do you plan to charge the capacitor?

[Groundloop]

@slayer007,

Press refresh on your browser. I have updated the drawing. The resistor value will be close to 90K but if you use a trimmer resistor as shown in the drawing then you can adjust for the correct voltage you want. Start with a low value on the trimmer resistor and use a digital volt meter to measure the voltage over the capacitor.

The NE-2 Neon bulbs will work just fine. You can also find Neon Bulbs in coffee cookers and old kitchen ovens for baking etc. Neon bulbs is used in almost all space heaters etc.
Just remember to remove the original resistor if you use a Neon bulb from 220 V equipments.

Groundloop.