Page 1 of 3 123 LastLast
Results 1 to 10 of 23

Thread: Relay Voltage question

  1. #1
    Variable Bitrate
    Join Date
    Dec 2007
    Location
    NY
    Posts
    268

    Relay Voltage question

    Does anyone happen to know the minimum triggering voltage to activate this relay:
    http://www.amazon.com/Relay-Harness-...pr_product_top

  2. #2
    FLAC SNOtwistR's Avatar
    Join Date
    Nov 2009
    Location
    Keswick,On Canada
    Posts
    1,619
    It not the voltage that triggers its the mA. I think if you have a lower voltage you need to use a relay for that voltage and then use that relay to trigger the 12v relay. Like a 5v relay that triggers a 12v relay. Hope this helps SNO

  3. #3
    Variable Bitrate
    Join Date
    Sep 2012
    Location
    Germany - Munich
    Posts
    379
    Why do you need this info?
    You should try to get the Datasheet.

  4. #4
    Variable Bitrate camo.b's Avatar
    Join Date
    Nov 2011
    Posts
    404
    Just checked a few supplys...5v 9.5v and 12v...only the 12v worked...tested this on a std auomotive 12v relay...sno is dead right

  5. #5
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    Of course Sno is right. Geez!

    Implicit in Sno's reply is that you match the relay's nominal or rated coil voltage to the voltage you are using - eg, 12V if 12V, 5V if 5V, and any voltage if an Open Collector aka GND signal.
    IOW you do not use 5V to turn on a 12V relay because - even if it does - it will not have its full contact force and hence be prone to (1) fire or (2) open circuits on bumps or if hot etc.

  6. #6
    Variable Bitrate camo.b's Avatar
    Join Date
    Nov 2011
    Posts
    404
    What i a good way to operate a 12v relay from a lesser voltage source...say 1.8v,3vor 5v is the a common tidy way to do this?....ive often thought of this.

  7. #7
    FLAC SNOtwistR's Avatar
    Join Date
    Nov 2009
    Location
    Keswick,On Canada
    Posts
    1,619
    I would use something like this cheap 5v relay board put my 12v+ to common and NO 12v+ going to the 12v relay pin 86 SNO
    Name:  5v_relay.jpg
Views: 81
Size:  44.4 KB

  8. #8
    Variable Bitrate
    Join Date
    Sep 2012
    Location
    Germany - Munich
    Posts
    379
    you never said, what you want operate with this low voltage. and where the voltage comes from?
    but one thing, be carefull because of the selfinduction.

  9. #9
    Variable Bitrate camo.b's Avatar
    Join Date
    Nov 2011
    Posts
    404
    Ive got a few of those in my ebay watch list...very cheap!!! Any ideas on 3v or under?

    Harryberlin what is selfinduction?

  10. #10
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118
    Quote Originally Posted by camo.b View Post
    What is a good way to operate a 12v relay from a lesser voltage source...say 1.8v,3vor 5v is the a common tidy way to do this?....ive often thought of this.
    Thru a buffer...

    Usually Open Collector - ie, they turn on a device (transistor, FET etc) that connects the output to 0V aka GND. As long as it can handle the relay's coil current (say up to 250mA for typical automotive 30A relays) then it can turn on any voltage relay. (As before, output to relay coil 85 and other end 86 to whatever +V it uses.)

    Whatever output (1.8V etc) must be able to turn on a transistor etc.

Page 1 of 3 123 LastLast

Similar Threads

  1. Quick Voltage Question
    By Ryven in forum CNX-P2140
    Replies: 3
    Last Post: 07-08-2011, 03:10 PM
  2. LCD Voltage Question
    By piersuk in forum LCD/Display
    Replies: 5
    Last Post: 08-30-2010, 11:47 PM
  3. Replies: 25
    Last Post: 02-16-2010, 01:32 AM
  4. quick question about dc voltage
    By cdm in forum Power Supplies
    Replies: 4
    Last Post: 03-05-2004, 03:19 AM
  5. tm701 voltage question
    By h_2_o in forum LCD/Display
    Replies: 5
    Last Post: 06-19-2003, 01:54 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •