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Re: [TCML] caps for quarter shrinker question
Hi Bamacoiler,
bamacoiler@xxxxxxxxx wrote:
I have a surplus suppply of many Sangamo direct current capacitors. I
would like to make a quarter crusher with them if possible. They are
rated 15kvdc 2.25µf.. If I connect 20 of them in parallel it comes out
to about 5kjoules. Will this work or do I need to use different type
capacitors? Any help is appreciated. Thanks in advance.
> Bamacoiler
They will probably work... at least for a while. 3-5 kilojoules is quite
adequate to demonstrate coin shrinking effects with US clad coins. I use
5 kilojoules to shrink US quarters to the diameter of a dime.
Connecting 20 identical caps in parallel will help share the peak
discharge current. This can be a very important consideration for
capacitors that are not specifically designed to deliver high current
pulses. Even under these reduced current conditions, your capacitors may
still internally arc if they happen to use metal tab technology to make
connection with the capacitor plates instead of the more robust
technique of soldering directly to the foil ends of the capacitor rolls.
Also, coin shrinking is a ringing load. Even after the coil is
destroyed, the plasma continues to conduct and the system rings (albeit
at a higher frequency) due to residual bus and internal capacitor
inductance. If your capacitors use a kraft paper-oil dielectric system,
they should be able to handle ringing discharges better than film-foil
capacitors. However, to prolong their life, you may wish to keep full
charge voltage to perhaps 80% (or less) of the faceplate DC rating.
Contact me off-list for other details and precautions before attempting
to construct this device.
Bert
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