piclist 2001\07\23\192009a >
Thread: How to control a 24V solenoid with a PIC and a transistor?
www.piclist.com/techref/microchip/ios.htm?key=solenoid
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face BY : Mike Kendall email (remove spam text)



Try a HEXFET from Industrial Rectifier

----- Original Message -----
From: "Tom Messenger" <spam_OUTkristEraseMEspamKILLspamTHEGRID.NET>
To: <@spam@PICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU>
Sent: Monday, July 23, 2001 9:23 PM
Subject: Re: [EE]: How to control a 24V solenoid with a PIC and a
transistor?


{Quote hidden}

resistance
> >(when on) than the solenoid (about 5 ohms). When I disconect the
solenoid,
> >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
24V/5
> ohms = 4.8AMPS.
>
> 4.8AMPS divided by beta of transistor is how much base current you need.
In
> saturation, a "rule of thumb" is beta of 20; try optimisically with beta
of
{Quote hidden}

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Subject (change) How to control a 24V solenoid with a PIC and a transistor?

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