Re: fly back diodes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "jimmy hynes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chunkyboy86-at-yahoo-dot-com>


the diodes i were using were huge 1"x1"x5" about, they were made by ir and i
knew almost nothing about them. all i knew is that there was 15kv wiring
attached to them. the flybacks work great, the only problem is arcing between
pins so i yoinked them out and put epoxy over it. thanks for the suggestion. 

 Tesla list wrote: 
>
> Original poster: "Daniel Barrett by way of Terry Fritz " 
>
> Hi Jimmy-
> Reverse recovery time is definitely a problem if you are using 'standard
> recovery' rectifiers such as the 1N4007. I have gone through about 400 of
> these learning that with my MOT supply ;)
> You might want to try a 'fast efficient' diode such as the UF4007. These are
> a bit more pricey at $.19 each (Mouser) but they have a 75nS recovery time.
> db
>
>
> Subject: fly back diodes
>
>
> > Original poster: "jimmy hynes by way of Terry Fritz "
>
> >
> >
> > i recently finished my first tesla coil, it has a 2x12" secondary and will
> only
> > make 3 inch arcs. i finally figured out what is wrong with it. i am using
> a
> > rectified solid state neon transformer. i think the reverse rec! overy time
> is
> > whats killing me here. i also have a pile of dead flybacks. instead of
> digging
> > for the hv diodes, could i just hook up the flyback secondarys to the
> > transformer. if the secondary is shorted then the inductance should be
> really
> > low and i think the resistance wouldnt be too bad at 20ma. i think i would
> just
> > have to worry about putting too much current through them. how long could
> i
> > keep the runs without melting the diodes? is there any other problem with
> this?
> >
>
>
>



JImmy