Re: Reg MKII's and cooling fans.

[Rich Rudman <rmanzan@tscnet.com>]

John Lussmyer wrote:
> 
> Ok, I can get some little 1.38" muffin fans for 89c each, though I may get
> the 2"x5/8" blower for $2.25 instead (it'll be easier to mount).
> 
> Now I have a choice on hooking these up.
> A) Add Yet Another set of wires to the mess, so I can power the fans and
> only have them come on when the charger is connected. (Use a relay off the
> AC to connect the fans to the 12v supply)
> 
> B) Use some 75c thermostats to switch the fans on when the regs get
> hot.  The problem is the ony cheap thermostats I can find turn on at 135
> deg F, and they are almost as big as the heat sink.
> 
> C) Figure out if I can easily make SOMETHING that would let me hook them up
> to the MKII (Internal Load) regs so they come on when the reg starts
> dissipating heat.  There are external load connectors on the reg, but I
> don't know if hooking up one of these little fans to them would cause a
> problem.
> 
> --
> John G. Lussmyer      mailto:Cougar@CasaDelGato.Com
> Dragons soar and Tigers prowl while I dream....
> http://www.CasaDelGato.Com

Don't mess with the current control loops on the MK2 fully loaded. I am
hanging the power Mosfet in it's linear region, it's in harms way.
messing with it will just cause it to go POOF!. If you wanted to do this
you need to get the Loadless regs. They work just like the the Mk1, and
are just a Fet turned on, these you can add fans and 300 watt landing
lights to , and not really damage the Reg itself. Just use a clamp diode
across the fet. 
	I (or Joe) can tell you how to convert a Loaded to a loadless Reg. THEN
you can get cute with your external loads.

-- 
Rich Rudman
Manzanita Micro
www.manzanitamicro.com
1-360-297-7383,Cell 1-360-620-6266