RE: Blast from the past...

From: Bil Herd (
Date: 2007-03-29 15:04:16

As long as the computer pulls a minimum of 200ma, and we didn't have good numbers on minimums back then, then the regulator would stay in regulation, a couple watts (if I remember correctly) at least were dissipated by the resistor rather than the regulator. It allowed them to used bent pieces of aluminum instead of anodized heat sinks, etc, and still be doing only half the heat.

What I learned was that in the sake of making something cheap you really could make some intelligent guesses if you were careful about things like what the aggregated minimum will be.



-----Original Message-----
From: [] On Behalf Of
Sent: Thursday, March 29, 2007 12:39 AM
Subject: RE: Blast from the past... 

Hallo Bil,

> The question is: What does this part do? Why does it work?

I think adding an extra 200 mA to the circuit because the 7805 was a bit underpowered for this board.

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