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Subject: Re: controlling leds

Date: 11/27/02 at 5:32 AM
Posted by: David Ashby
E-mail: dashby@quin.co.uk
Message Posted:

In Reply to: Re: controlling leds posted by Richard Astley on 11/27/02 at 3:14 AM:

Hi Richard,

You still connect the collector of the TIP31 to +12V.

The circuit Russ describes will look like this:

+12V----+-------------+---
| |
/ 10K |
\ POT |C
/ |/
\<---------B| TIP31
/ |\
\ |E
| |
| +----+----
| | |
| / /
| \ \ 390R Resistors
| / /
| | |
| V V LEDs
| - -
| | |
0V -----+-------------+----+----

Hope the ascii drawing is intelligible!

You're right about the 390 ohm resistor + LEDs, you just add them in parallel to build up your array.


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