[simpits-tech] I really should have seen this coming...

[Gene Buckle]

On Tue, 7 Sep 2010, Gene Buckle wrote:
(forgot to add something...)

The chips the Centipede uses can't direct-drive loads greater than what an 
LED would typically consume (20mA each - the chip has a max of 24mA, per 
pin).  However, they can source enough current at 5VDC to easily drive 
what is known as a "logic-level" MOSFET.  This means that you can build a 
little circuit to use MOSFETs to drive relays, motors, incandescent bulbs, 
or other devices that require more than 20mA at 5VDC to run.

A good choice for driving lamps is a BS270.  It comes in a TO-92 package 
and is dirt cheap.  They'll handle 400mA, which is perfect for lamps and 
can handle up to 60VDC.  If you have a really high power need, the IRL620 
comes in a TO-220 package and will handle up to 10A at (I think) over 
100VDC.

Here's a nice description of using a MOSFET as a switch, using the BS270 
part mentioned earlier:
http://brunningsoftware.co.uk/FET.htm

g.


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