Re: SCR based coil

• To: tesla-at-pupman-dot-com
• Subject: Re: SCR based coil
• From: NickandSim-at-aol-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Tue, 26 Jan 1999 19:05:53 -0700
• Approved: twf-at-verinet-dot-com

To All,
          I wondered if anyone has thought about using big bipolars for the
drive. The transistors used for scan coil drive circuits in TV are rated a 15A
at 450V and cost £0.89 each.  They are therefore perfect for use in big banks
to drive a tesla.  The caps to provide the huge pulse current for it are also
very cheaply available from old TVs or computer monitors. (hang around behind
office blocks when they throw stuff out).  An alternative drive circuit that I
have devised is a two big ( 200V ) zener diodes  in series (giving 400V total)
to detect when the desired peak voltage has been reached and then trigger the
bipolars to discharge the capacitors.  There is also a small circuit to keep
the bipolars on while the caps discharge.

Nick Field     
 

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