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I think that steel is a questionable material, you have to try checking whether it is stainless or not (the small amount of vanadium, nickel and chromium seem to remove magnetic properties, or decrease the effect of a magnetic field), and try to use a magnet on it. Also it seems pretty hard and it might be hard to cut or shape.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Read up on how comparators and voltage dividers work. A voltage reference is compared against a scaled down voltage in the capacitor bank, when the voltage is high enough, the comparator inhibits the charging circuit (which otherwise would run continually). You need to re-calculate the values so that your charger shuts off before it reaches 100V. Think about adding a potentiometer to adjust the voltage.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
The "oil hardening drill rod" (which you will receive in un-hardened state) has magnetic properties similar to plain cold-rolled steel from the hardware store. Shouldn't be hard to cut off and file or grind to a point. The extra cost could be justified if you need a special diameter to closely fit your barrel.
Registered Member #2114
Joined: Fri May 08 2009, 11:58AM
Location: London, Ontario
Posts: 36
I would like to know what voltage the capacitors for the boost converter should be rated for, the website doesn't say and i don't want to buy the wrong ones. Or would it best to go with the ones rated for the highest voltage?
Registered Member #1525
Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
That boost converter has a comparator (the triangular component on the diagram) which automatically shuts off the charging circuit as soon as the capacitor bank reaches a specified voltage.
You specify what voltage your bank shuts off at by turning the variable resistor (or potentiometer), indicated on the diagram by a resistor with the wiper on the side.
So technically you can use any caps if you play with the comparator and get it to shut the charger off at your desired voltage. As suggested by aonomus, read up on voltage dividers (very simple) to figure out how to do this.
Also be careful, don't mess with high energies until you know exactly what you are doing.
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A few Questions
