Hello,

    I'm trying to turn a 24V solenoid (electro-magnet) with an NPN
transistor (TIP41) wired to a PIC. Here's the circuit:


                   24V-----------+
                             solenoid (with reverse diode)
                     C-----------+
    PIC----10K--+----B
                |    E
               1K    |
                |    |
               GND  GND

    It's not working. It seens the transistor have a much larger 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?

    Thanks,

    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
-----------------------------------

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