Carl Denk wrote:
> subject=Re:[EE:] - Heat sink??
> source= http://www.piclist.com/piclist/2006/11/23/121602a.txt?
>
> ---
>
> http://www.piclist.com/member/cdenk-alltel-
> PIC/PICList FAQ: http://www.piclist.com
>
> Here's the latest on this thread:
> Found some switching 5 volt wall warts that actually under my load are 
> more like 5.4 volts actual. The PIC 18F1320 has 5.5 volt max. input, but 
> the pressure sensors have a 5.2 volt max. Think I'll return the 5 volt 
> wall warts to Digikey, and order a 6 volt switching or linear wall wart, 
> and change the on board regulator from 7805 to a LDO LM2930T. The board 
> is going to fabrication (quantity 3 or 4 to include spares to last a 
> long time) with space for the TO3 regulator and a wire hole for direct 5 
> volt.
>
> Comments always appreciated. :)
>   
Why not just increase the load, using an external 25 ohm resistor would 
give you a constant 200mA
load and would probably make the  wall wart switcher  fall into 5.0v 
range. There would be some heat, but
would be only (P=I*V; P=.2*5) or  1 watt.

--Bob

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