Terry's DRSSTC - Frequency/Pulse Width Controller

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi All,

For my DRSSTC, I was going to have two knobs.  A 100k single turn pot in 
series with a 1k resistor to do the pulse width and basically act as a 
power controller following Steve's suggestion.  And another pot set up just 
like it (maybe a ten turn) for the pulse width.  The "linear" pulse width 
thing is easy with a LMC555 timer.

However, most LMC555 circuits and their types are  "F : 1/R"  type circuits 
so the frequency control is not at all linear.  I was thinking zero on the 
pot would be like 1Hz, 25% on the pot 250Hz, 50% on the post 500Hz, 100% on 
the pot 1000 Hz...

I just wanted to check to see if anyone and an easy simple way to do 
that?  I checked around for ICs and such, but did not find any wonderful 
solutions.  I can probably do it with a few simple digital chips, but 
thought I would ask...

I am going for primary current trip and IGBT temperature 
protection...  Still trying to figure out how to "saw up" the box...  I did 
get one heck of a terminal block milled out for the output ;-)  IGBT cross 
conduction will be "controlled" buy a 1/4 inch thick sheet of lexan :o))

All is going well, but I "had" to buy a bunch of power tools for the 
project too :o)))  Also worked on the tube coil and replaced the grid 
resistors with TO-220 types from Digikey and a real heat sink now so the 
coil would not smell like burning wood...  Getting ready for Gerry and I's 
"show" on the 29th...


In a brilliant leap in cybersquatting, guess who 
grabbed  www.drsstc.com  :0)))  Nothing there this moment but the jump 
pages, but I hope to put all my DRSSTC stuff there and link all the other 
cool DRSSTC sites.  I hope to avoid the "void" with my OLTC thing...  That 
server can also host other DRSSTC sites under it since it is a full high 
powered server thing with individual sites and E-mail and all...   If 
anyone has any ideas for the site or you want to put your DRSSTC stuff 
there (DRSSTC stuff ONLY though) let me know at:

terry-drsstc(put an asterisk thing here)drsstc.com

I have a big list of folk's sites to get linked up already.  I am even 
using real web publishing software now, but I have found that is it "me" 
not the "software" :o))  So no "flashy stuff" still :-))))


BTW - Rather than being on the "bleeding edge" of this DRSSTC stuff I am 
now "following" :o)))  It's sort of nice :-)))  Many thank to those that 
figured the hard stuff out!!!  I really think the DRSSTC will change 
"everything" in our hobby!!!

Cheers,

	Terry