Re: MOSFET Coil- Ready..Set...

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

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>


 > Hi Dan,
 >
 > Thanks for the substitutions. I am going to try to look for those later. I
 > chose this design because I liked the idea of a self adjusting, self
 > resonant oscillator, and it looked like a really simple circuit, but the
 > component selection may be a little more exotic than I thought. I don't
like
 > designs with exotic components, especially in  things like a Tesla coils,
 > where active components are expected to blow up on a regular basis! :-).
 >
 > It also seems that the only place the HC74LS14 is mentioned on the
internet
 > is that particular circuit that I want to build!
 > http://dave.golfbuddys-dot-com/hvguy/new/P460Hbridge/schematic.GIF
 >
 > Thanks again,
 > Sue

Another thing is a lot of times you'll see circuits on the web which are
created by international (non-US) individuals and a lot of times there will
be components which are more
readily available in those countries than here in the US and vice versa at
least via their local distributors.

Also, MAXIM is very good for free samples (in quantities of 2 usually), so
they might have the MAX913 IC you were looking at.

I'm sure if you could get a sample circuit posted to the web, that myself,
Justin, or some of the other SSTC guys and gals here could help you get
substitute parts for your design.

Don't feel bad.  Every day at work i'm forced to find different ICs for
designs I'm working on.  You need say an op-amp with this much bandwidth and
this much slew rate and this voltage, you find one that fits the bill
exactly, and once you submit it to the parts engineering group they'll
reject it either because its on the future (<10 years) list to become
obsolete, they don't like the vendor, they don't like the reliability data,
etc...

The Captain



 >  > Sue,
 >  >
 >  > You can also try www.newark-dot-com  and www.alliedelec-dot-com
 >  >
 >  > Also, i wouldn't limit yourself to the chips listed below.  There are
many
 >  > similar ICs which are more readily available than these components
which
 >  > will do the same
 >  > exact job.  For example, Linear Technology's LT1016, although not as
fast,
 >  > is a drop-in replacement for the MAX913.  This component is readily
 >  > available and digikey has
 >  > thousands of this IC in stock.  Similarily, the HC74LS14 can be
replaced
 > by
 >  > similar logic family ICs such as the SN74LS14 etc...  Although I think
the
 >  > HC denotes high current output
 >  > capability, i really don't think its necessary for the design.  The
 > MAX4420
 >  > can be replaced with the TC4421 or TC4422 MOSFET driver ICs which again
 > are
 >  > readily available.
 >  >
 >  > Hope this helps.
 >  >
 >  > The Captain
 >  >
 >  >
 >  >
 >  >  > Hi All,
 >  >  >
 >  >  > I am finally getting serious about building a mosfet coil. I
actually
 >  > wound
 >  >  > the gate drive transformer so far!
 >  >  > I want to build the self resonant design of Justin and Arons that
 > employs
 >  >  > the H bridge with the P460s. I usually get parts from a local supply
 >  > house,
 >  >  > but lately they have made me wait months for parts that they don't
have
 > on
 >  >  > hand. I have been waiting since January for a soldering iron tip,
and
 > in
 >  >  > another instance they came up with a part that I put on order last
 > year,
 >  > and
 >  >  > I refused to buy it because I forgot what I wanted it for! Are there
 > any
 >  >  > suppliers on the net that I can order the ICs from without having to
 >  > contend
 >  >  > with bulk, and rediculous minimum orders?
 >  >  >
 >  >  > I need the MAX913, HC74LS14, and the MAX4420 for the driver. I would
 > like
 >  > to
 >  >  > get maybe 10 of each component. I tried Digi Key, and they require
an
 >  > order
 >  >  > of 50 of each device, Mouser doesn't have 'em.
 >  >  >
 >  >  > Any info, or help would be appreciated!
 >  >  >
 >  >  > Thanks,
 >  >  > Sue
 >  >  >
 >  >  >
 >  >  >
 >  >  >
 >  >  >
 >  >
 >
 >
 >
 >
 >