need help please

Discussion in 'The Projects Forum' started by patp, Jul 4, 2014.

  1. patp

    Thread Starter New Member

    Jul 4, 2014
    1
    0
    im working to a special project
    the thing is i wana be able to active my 9v circuit ( completly independent ) from a output of 1.5v
    so the 1.5 on ( a LED ) is active i wana be able to active the 9v circuit
    any sugestion ?
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    I don't like to nitpick but someone has to tell you.

    A subject title of "need help please" is of no help to anyone. Try to be more descriptive in your subject title.

    Even if English is a Second Language (ESL) for you, it displays laziness on your part when you write with poor spelling, grammar and punctuation.

    Proper communication skills matter.
     
    Alec_t, absf and hexreader like this.
  3. crutschow

    Expert

    Mar 14, 2008
    13,023
    3,236
    What do you mean "completely independent"? :confused:
    Can the circuits share a common ground?
     
  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Most optocouplers can be activated by 1.2v on their inbuilt LED.
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,801
    1,105
    What is this mystical '9V circuit'? How much current does it draw?
     
  6. john_doe01

    New Member

    Nov 27, 2011
    24
    0
    i dont think the questions about isolation (apologies if im wrong), think the OP just wants a 1.5V single to trigger something on a 9v rail, if this is the case a npn transistor will do
     
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