reed relay in diy lc meter

Discussion in 'General Electronics Chat' started by philcul, Apr 30, 2012.

  1. philcul

    Thread Starter New Member

    Apr 30, 2012
    1
    0
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    There are 4 broken links in your post.
    All pictures refer to your local diskdrive C, wich is not allowed on the internet.
    Can you upload the pictures to the forum?

    Bertus
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The PIC pin 18 asserts a low in order to engage the reed relay.

    There is no diode providing reverse-EMF protection for the PIC for when the relay coil's ground is removed. However, you might get away with that due to the high resistance of the reed relay's coil and the 100 Ohm resistor in series with it.
     
    philcul likes this.
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    There are reed relays available with a build-in diode.
    Then there is no seperate back-EMF diode needed.

    Bertus
     
Loading...