Re: chokes and caps
From: Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
Reply To: bert.hickman-at-aquila-dot-com
Sent: Sunday, November 30, 1997 6:46 PM
To: Tesla List
Subject: Re: chokes and caps
Tesla List wrote:
> From: Matthew Mills[SMTP:megavolt-at-usa-dot-net]
> Reply To: megavolt-at-usa-dot-net
> Sent: Sunday, November 30, 1997 2:05 PM
> To: Tesla List
> Subject: chokes and caps
> Hi, I have got my hands on several large two lead ballasts from mercury
> vapour lamps 400W-at-250V and the large rolled polypropylene caps
> (30uF-at-250V) I was wondering whether I can use the ballasts as chokes
> (they are just like a transformer with only one winding) and if I can
> use the caps for PFC capacitors.
You may be able to use the ballasts AS ballast inductors if you are
powering your system from a non-current limited transformer. However,
you may need to connect these in parallel in order to be able to pass
the desired level of current through them.
> These also have a brown/black/green (1M?) resistor across the terminals
> I guess as a drain.
> They seem to be in the "ballpark" (hope I've used this term in the right
> context) for PFC caps
> do I place them parallel to my neons or parallel to my Variac?
You'd normally connect the PFC's in parallel with the neon primary to
reduce the current load on both your variac and the incoming line. They
are a little low on the voltage rating - typically you should use caps
with a voltage rating of about 3X the incoming RMS voltage - say 330
VAC. Connect them in parallel with your neon(s) and try them out!
Safe coilin' to you!-at-
-- Bert --