Derringer II LED output voltage

Hey all,

This question is in regards to an old school alarm.  A Derringer II made by now out-of-business VSE.

I'm going to swap the alarm out and put in a Crimestopper alarm.  Just something basic (door locks and flashing lights), nothing fancy.  However, there are currently 3 LEDs from the Derringer alarm.  I'd like to keep those 3 LEDs if at all possible. 

My question then is:  What is the voltage output for the LED out of the Derringer alarm?  (if no one knows, how can I test for this voltage output?)

Thanks!

Teken,

Thanks for the response.  The Derringer doesn't work that great right now.  Hence the reason for changing alarm systems.  I can't really get a voltage reading from the current LED out, because I can't arm the alarm!

So, if someone happens to have the voltage knowledge that would be great!

Thanks!

Teken,

Thanks for the info.  A couple of more questions.

1.  Which way is which on the resistor?  You said put it inline with the LEDs.  I assume it goes on the positive wire.  But is there a "direction" the resistor goes?

2.  What resistence should I use if the output of the AlarmBrain is 3volts?

3.  What are the "popular" LED output voltages for alarms?  12v? 3v? 2v?

I like your idea of seeing if the LED is dim.  If it's dim that means it's not 12v.  The LED output from my NEW alarmbrain will be 3v.  I just want to make sure I don't have 2v LEDs in there currrently.

Thanks!

Dumb question.  I ASSume I can just look on the brain to see which version of the alarm I have (I thought I'd ask first before I rip it out and work half way thru and then post and wait for a response). 

Will the brain say DerringerII v2?  or will it say DerringerII and I gotta guess?  This alarm is circa '94, so I have a funny feeling it might be the "newer v2" version.   But I can always hope!