[TriEmbed] Transistor as switch

[Glen Smith]

Brian,

One of the things that I was looking for help with at the most recent
meeting was driving a motor with an Arduino. Gene and Shane both took a
look at the circuit I was using and said basically the same thing. Shane
followed up with an email, in which he pointed to this web site and circuit
diagram:
http://bildr.org/2011/03/high-power-control-with-arduino-and-tip120/

I am using the TIP121 (a slightly higher voltage capacity version of the
TIP120 shown) and while I have not had a chance to get back to this, have
every expectation that it will work fine. The TIP120, 121 and 122
Darlington pair transistors are widely used for this very function and are
pretty cheap.

Glen



On Mon, Jun 15, 2015 at 7:08 PM, Grawburg via TriEmbed <
triembed at triembed.org> wrote:

> Because this is a project for kids <14 I think I'll introduce them to a
> relay.  The project already has a transistor to operate an LED in
> conjunction with a Dallas one-wire temperature probe to indicate high
> temperature. The relay will turn on the motor so that the kids will see two
> ways to control devices externally powered (a flashing LED & the motor).  I
> guess I could consider a MOSFET, but I think it's more than I want to
> tackle at this point ... class is next week.
>
> Thanks for your comments, guys.
>
>
> Brian
>
>
>
>
>
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