[TCML] flyback primary wireing

[Scott Bogard]

Another curious thing I have noticed (using it to drive a plasma globe) is that the output drops slightly when I touch the globe.  I am using a TIP3055 (not an NPN 3055,) it doesn't seem to get too hot, and I don't know what the current is because it scrambles my digital multimeter!  Perhaps more primary turns will fix that (or a different transistor.)  Thanks guys for your responses.

Scott Bogard

> Date: Sat, 16 Aug 2008 12:49:53 +0000
> From: steven219 at btinternet.com
> Subject: Re: [TCML] flyback primary wireing
> To: tesla at pupman.com
> CC: 
> 
> Hope its not off topic 'cos I've been playing with flybacks for years to power small Tesla coils. Actually the number of turns doesn't matter too much, whatever works best for you is the answer. Mostly it depends on the particular flyback you have. 2-5 turns is about right, 2 turns will give you the higher output voltage, but it could be too much for some flybacks.
> 
> 
> 
> ----- Original Message ----
> From: Scott Bogard <teslas-intern at hotmail.com>
> To: tesla at pupman.com
> Sent: Saturday, 16 August, 2008 5:01:49 AM
> Subject: [TCML] flyback primary wireing
> 
> 
> Hey all,
>     A quick and quasi off-topic question, how does one determine the 
> best number of primary (and feedback) turns to use on a simple single 
> transistor flyback driver (like this one
> http://bogard.110mb.com/Plasmaglobe.htm
> ?)  I seem to be getting the most power using the original 2 turn 
> primary, but most sources say 5 or more turns is best.  Is it simply a 
> matter of desired impedance or is there more to it (like the transistors 
> internal resistance, or the ratio of the two other resistors.)  Thanks, 
> feel free to respond off list, as this is quasi-off topic.
> 
> Scott Bogard.
> 
> 
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