Re: an idea for a cheapie solid state coil

To: tesla-at-poodle.pupman-dot-com
Subject: Re: an idea for a cheapie solid state coil
From: Tesla List <tesla-at-stic-dot-net>
Date: Sat, 10 May 1997 23:33:28 -0500
Approved: tesla-at-stic-dot-net

Subject:     Re: an idea for a cheapie solid state coil
      Date:  Sat, 10 May 1997 08:00:47 -0700
      From:  Gary Weaver <gweaver-at-earthlink-dot-net>
        To:  Tesla List <tesla-at-pupman-dot-com>
References: 
           1


Tesla List wrote:
> 
> Subject:  an idea for a cheapie solid state coil
>   Date:   Thu, 8 May 97 14:17:07 UT
>   From:   "William Noble" <William_B_Noble-at-msn-dot-com>
>     To:   "Tesla List" <tesla-at-pupman-dot-com>
> 
> thought experiment - consider the following:
> 
> PC power supplies are 65 to 250 watt.  Dead ones cost a dollar or two at
> swap
> meets (what we here on the west call ham fests).  They are a switching
> regulator.  Newer ones switch in the 70 to 300 Khz range which is in the
> ball
> park for tesla work.  A 200 watt supply will output lots of 5V current
> (20
> amps or more) with smaller amounts of 12V.
> 
> Remove diodes for -5, -12 vdc outputs - they won't be needed.  remove
> diodes
> for +12 and +5 and see if the circuit oscillates.  (fix until it does).
> Sometimes there is feedback from 5V, often a crowbar on 5V.
> 
> Once the thing oscillates, take the 5V winding from the Xformer and
> bring it
> out of the supply and use it to excite a primary coil directly.




I have never tried to run a TC on 5 volts.  I don't think it will work.

Gary Weaver




  Adjust
> inductance of primary so the supply doesn't go into current limit - you
> might
> be able to wind a primary (helical) near a 3 or 4 inch dia secondary,
> and then
> slide some ferrite rods in the bottom to adjust inductance.
> 
> Most newer supplies use PWM chip - if you look up the specs on the chip
> it
> might let you have lots of fun control over what the supply does.