Re: Solid State Egg of Columbus Driver - Circuit Review Requested (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Sat, 28 Oct 2006 14:23:24 -0700
From: Don Murray <don@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Solid State Egg of Columbus Driver - Circuit Review Requested (fwd)



Tesla list wrote:
> Original poster: List moderator <mod1@xxxxxxxxxx>
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Wed, 25 Oct 2006 22:01:11 -0700
> From: Cameron B. Prince <cplists@xxxxxxxxxxxxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: Solid State Egg of Columbus Driver - Circuit Review Requested (fwd)
> 
> Hey guys,
> 
> 
>>Here's the schematic:
>>
>>http://www.teslauniverse.com/circuits/egg_of_columbus_driver.pdf
> 
> 
> I built the driver portion of the circuit listed above on a breadboard last
> night. The inverter based square wave generator worked like a champ. I had a
> solid output at a steady frequency variable between 45Hz and 65Hz. The JK
> flip-flops failed miserably. They caused the output to have a sharp point on
> the bottom of the wave and the frequency jumped all over the place.
> 
> Either the guy who came up with the idea was way off, or I somehow
> misunderstood how to connect the flip-flops in the circuit. I tried to email
> him and got no reply.
> 
> I have been searching tonight for about the past hour and I finally ran
> across something that looks hopeful:
> 
> Shift registers and resistors deliver multiphase sine waves
> This simple method uses only digital logic and fixed-value resistors.
> 
> http://www.edn.com/contents/images/6321527.pdf
> 
> (Scroll down to page 5)
> 
> This looks really promising and I'm going to make a Digi-Key order tomorrow.
> 
> Thanks,
> Cameron
> 
> 
> 
> 
> 

Cameron,

   I know you are building this to operate on single phase, so this 
might not help, but you or someone else might get some good ideas from 
it, that could help. They used to supply old 2-phase loads from 3-phase 
systems using Scott connections, which take specially wound 
transformers. I'd photographed and posted on my web site, some pages 
from a General Electric Distribution Transformer Manual some time ago 
for another discussion. The very last ones show 3, 4, and 5 wire Scott 
connections, including phase angles. You can see these at:

http://murrayranch.com/Electricity.htm


You would most likely have to wind your own transformers.

Don