Re: multi-game proto board

At 09:49 PM 5/4/97 -0400, David wrote:
> Fri, 2 May 1997, Zonn wrote:
>
>> But mostly it would be changing values here and there to handle
>> the higher +/- 50 volts.
>
>I'm sure there's some sort of arrangement that would allow you to jack up
>the current without changing the working voltage (somehow I keep thinking
>of a Darlington arrangement but my analog knowlege is VERY rusty; gonna
>have to look it up).

No, sorry Dave, it doesn't work that way (too bad huh?). In order for you
to get more current through the Yoke you must either raise the voltages
across the windings, or lower the inductance of the yoke. So unless you're
up for re-winding you're yoke, you're going to have to increase the voltages.

A darlington is used where more current gain is needed. The amount of
current a transistor passes, is proportional to the amount of current you
pump into it. And this is dependent upon the gain of the transistor. So if
your using something that puts out only small amounts of current (like an op
amp) and you want to use it to control a large amount of current, you can
use a darlington arrangement to amplify the meager currents of the op amp,
to the high currents needing controlling. Unfortunately those currents are
still controlled by the maximum voltage you can place across the load, and
the value of the load itself.

-Zonn
Received on Mon May 5 10:00:49 1997