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Re: Driving relay with transistor question

Subject: Re: Driving relay with transistor question
From: Bob Monsen
Date: Thu, 15 Dec 2005 22:08:31 -0800
Newsgroups: sci.electronics.basics
On Thu, 15 Dec 2005 13:43:17 -0800, jdege wrote:

> In series between the output pin and the base of the transistor?

A PIC will source 20mA or more from out output. That will really saturate
the NPN. You can probably cut that back to less than 10mA using a resistor
between output and base, and still maintain saturation. If you do this,
you can just put the LED in series here.

-- 
Regards,
  Bob Monsen

PATRICIA PAIWONSKI gave Ben Caxton the all-out kiss of brotherhood
before he knew what hit him.

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