Look at a TIP120 darlington.  It has a beta of 1000 up to about 5A.
Like any darlington the saturation voltage is a little high so It may
need a heatsink if the solenoid is on for long, but I think it will fit
in your existing PCB.  It probably costs more than the TIP41 but less
than a Hexfet.

Sherpa Doug

> -----Original Message-----
> From: Edson Brusque [mailto:ebrusque@TERRA.COM.BR]
> Sent: Monday, July 23, 2001 9:46 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: How to control a 24V solenoid with a PIC and a
> transistor?
>
>
> Hello,
>
>     now I'm thinking about using a small signal transistor
> (BC548) to give
> the TIP41 more current.
>
>     Someone can point me how can I connect the two? May I use it the
> Darlington's way?
>
>     Regards,
>
>     Brusque
>
> -----------------------------------
> Edson Brusque
> Research and Development
> C.I.Tronics Lighting Designers Ltda
> (47) 323-2138  /  (47) 9993-6453
> Blumenau  -  SC  -  Brazil
> www.citronics.com.br
> -----------------------------------
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body