[dorkbotnyc-blabber] Circuit Help

[Chris Vecchio]

It's weird that there's no current spec for the open collector output.

A relay should do the trick however and you're right that you will
need a diode to protect the PIR sensor from the relay's inductive kick.

I can send you a schematic of how to do it if you want.

    - Chris


	-------Original Message-------
  From: Alexander Makenzie
  Subject: [dorkbotnyc-blabber] Circuit Help
  Sent: 28 May '08 16:54

  Hello

  I am trying to figure out how to make this PIR sensor work that I just
  bought with another component I need to use.

  data sheet:
  [LINK: http://www.electronics123.net/amazon/datasheet/kc7786.pdf]
http://www.electronics123.net/amazon/datasheet/kc7786.pdf

  Basically, I light electroluminescent panels with these special high
  frequency transformers, they run on 12vdc. I have been running them
  using this 12vdc wall transformer, it is regulated a 1 amp with no
  problem. However when I connect the PIR sensor the output voltage
  becomes 12vdc at .2 amps and this is too low to drive the transformer
  and therefore won't turn the light on.

  So, I need the slightest boost. It has been suggested to me to use a
  relay. This is where my confusion begins. I have been reading about
  them, I understand the premise, but I only need a slight bump up of
  the amperage not voltage.

  I have also been advised that due to the sensitivity of this PIR
  circuit I'll need to protect it from the electro magnetic pulse
  discharged from the relay when switching off.

  Can anyone help me here?

  Thank You!
  Alex

  --

  www.alexmakenzie.com
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