[simpits-tech] Control Voltage

[Joseph Fagner]

Just build you a small circuit that uses a 7805 voltage regulator.  That
way you keep the 5 volts the 5451 requires, don't run the risk of
burning out your parallel port and you can use 12V, 9v or what ever DC
supply voltage you have available, as the 7805 will convert it to a nice
stable 5 volts.  I found this little circuit on the web, it's cheap and
easy to build and the parts are easy to find.

http://www.mrollins.com/pwrsp3.html

I just started working on mine last night.

Jay

-----Original Message-----
From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org] On Behalf Of
francisco@picornell.net
Sent: Monday, December 30, 2002 7:28 AM
To: simpits-tech@simpits.org
Subject: [simpits-tech] Control Voltage

I have been working on my MM5451 setup and instead of using the 5 volts
directly off the printer port to power the lights, I want to use it to
switch
a higher voltage setup (12 volts) so I draw the mim. power from the
computer.
The local computer junkshop has offered to help be build such a circuit.
In summary usung 5 VDC as my control cricuite to switch a higher voltage
(12 VDC) which will wire directly to the lights.

1. Has anyone done this ?
2. Would anyone be inerested in such a circuit ?
3. What should I expect to pay ?

Each circuit would have approx. 70 switch ports (if that is the right
word)

Kiko



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