How to control a 24V solenoid with a PIC and a transistor?
Mike Kendall email (remove spam text)
Try a HEXFET from Industrial Rectifier
----- Original Message -----
From: "Tom Messenger" <THEGRID.NET> krist
To: <MITVMA.MIT.EDU> PICLIST
Sent: Monday, July 23, 2001 9:23 PM
Subject: Re: [EE]: How to control a 24V solenoid with a PIC and a
> >(when on) than the solenoid (about 5 ohms). When I disconect the
> >the multimeter shows 24V ok when PIC pin is high. With the solenoid, it
> >shows below 1V (more like a hundered millivolt).
> > Please, someone can help me?
> Sure. Try a little Ohm's law first. Desired collector current will be
> ohms = 4.8AMPS.
> 4.8AMPS divided by beta of transistor is how much base current you need.
> saturation, a "rule of thumb" is beta of 20; try optimisically with beta
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See also: www.piclist.com/techref/microchip/ios.htm?key=solenoid
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