29 replies to this topic

[Mr. M]

One important point, this circuit is a voltage doubler meaning there is 340V DC going to the charging caps. This is an extreme safety issue if you are not familiar with high voltage electronics. Caution here. And the design shown is for 120V AC source.

[Mr. M]

Not shown is the coil design, wire size and number of turns along with what steel comp to use. These are important details. The coil resistance and inductance has to be matched to the capacitor parasitic resistance to get maximum power transfer to the coils. The polarity of the coils also needs to be correct to get the magnetic fields aligned for the magnetic circuit. Another choice is if the coils are in series or parallel which has to do with optimizing the power transfer based on the capacitor parasitics and the coil inductance.

[Dave_12]

Mr M exactly -    
What is the length and diameter of the steel rods ?
What is the length and gauge of the copper wire  wound around each steel rod? 

[Mr. M]

There is a partial answer for this, length of each coil is about 10 cm with a diameter of 2 cm. You really can’t pick the turns and gage without knowing the exact capacitor due to its parasitic resistance. You have to match the coil to this. The coil resistance needs to match the caps parasitic resistance. And you have to know what steel you are using too so you take into account its permeativity. Ball park is about 100 turns of 14 gage with low resistance caps.

[Dave_12]

Here is a calculator to work out the length of wire needed  to get the resistance needed  

Wire Resistance Calculator - Cirris Inc