Hi,
Options:
Zetex superbeta transistor.
Darlington circuit (Vcesat around 1V, if it is OK)
PNP on high side to drive the NPN
MOSFet (The elegant solution )
Peter

-----Original Message-----
From: Lynx {Glenn Jones} [mailto:jones_gl@EFN.ORG]
Sent: Tuesday, August 29, 2000 11:32 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Driving a solenoid


Hello all,
I need to drive a solenoid. Currently, i have it connected to a NPN
transistor as a low side driver. This is all well and good, but the
transistor requires aprroxamately 100ma of base current which is of course
beyond the capability of the pic pin im using to control the system. Does
anyone have any good ideas of how to drive this 100ma base current? i
tried using a resistor to pull the base high with 100ma and a smaller NPN
transistor to drive it to ground, but this seems like its wasting a lot of
current. Thanks in advance, and best regards. Glenn

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