A darlington like a TIP147 wouldn't be a good go because of the low Vce
voltage. A fet would be a better option here. The IRLZ44 (I think that's
the number ... just going off memory here) as was suggested earlier, I
think, would be the way to go.

Adios,
LarZ

---------------  TAMA - The Strongest Name in Drums  ---------------

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Edson Brusque
Sent: Tuesday, 24 July 2001 8:06
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: How to control a 24V solenoid with a PIC and a
transistor?

    When I designed the PCB I was thinking in using this transistor to
switch a lower current device, but the client decided to use this
hi-power
solenoid, this is where my problem started. I would like to add a BC548
to
drive the TIP41, but I don't want to mess with the PCB. The TIP41 have
HFE
(about 15 at 3A), so I'm thinking in replacing it with a high gain power
transistor (maybe a darlington one?) or a FET. What parts would be a
good
suggestion?

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