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2x tip31 and stereo female 3,5 mm jack

Discussion in 'General Electronics Discussion' started by Anon_41854, Oct 25, 2015.

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  1. Anon_41854

    Anon_41854 Guest

    Hello,
    is this correct, i am newbie and i was wondering if this is even correct and how to connect female audio jack does pin 3 connect to GND or -.
    Thanks in advance

    have a nice day:)
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,721
    1,913
    Sep 5, 2009
    Hi Gregor
    welcome to EP :)

    no, that circuit isn't going to work

    Reverse ALL your LEDs


    Dave
     
  3. Anon_41854

    Anon_41854 Guest

    Thanks, ok i will reverse them, my skill in electricity is on primary school level, but i was allways fascinated by that stuff so i bought myself soldering iron and sturted with something :) and now i want to do something more complex so here i am ;)

    i replaced audi jack with 2 rca connectors for right and left channel. Is this right?
    And if connection from rca goes to GND or - on battery?
     

    Attached Files:

  4. davenn

    davenn Moderator

    13,721
    1,913
    Sep 5, 2009
    the RCA grounds need to go to the battery negative
    and remove the GND from that switch leave that side of the switch unconnected


    Dave
     
  5. Martaine2005

    Martaine2005

    3,085
    849
    May 12, 2015
    To add to what Dave said,
    These "instructables" should be called "destructibles"... They are a menace..
    You will damage your amp. It's not 'if', it's 'when'...

    I also notice that you are using RCA's. I can only assume that you will plugging directly to an amp output.
    You might want to consider putting a diode across base and emitter to stop the negative ac killing the transistor and may be your output too.
    I would also consider a base and led current limiting resistor.

    These circuits only work with high volume. There are much better and safer circuits to use with your audio / computer equipment.

    Martin
     
  6. Anon_41854

    Anon_41854 Guest

    Hello,
    thanks for replay and giving solution. I did add base resistors and LED resistors then i added diodes between base and emitter and added resistor between emitters and deleted switch. will buy one housing for battery with switch. Hope this is somewhat correct :)
     

    Attached Files:

  7. Martaine2005

    Martaine2005

    3,085
    849
    May 12, 2015
    Hello,
    The diodes now need reversing.
    You shouldn't need the resistor across the emitters.
    Depending how bright they get, you might need to change the led resistor. Maybe 150 or 200 Ohms.

    Martin.
     
  8. Anon_41854

    Anon_41854 Guest

    Ok, thanks, i will reverse the diodes and put variable resistor on leds and delete resistor between emitters. Then i hope i will be able to create board in eagle and send gerber to manufacturer. i will post myresuslts :)
    Thanks again

    Have a nice day
     
  9. Martaine2005

    Martaine2005

    3,085
    849
    May 12, 2015
    Hi,
    I wouldn't do anything like that for this!!
    You need to breadboard the circuit first and test it...
    Or vero-board if soldering is preferable..
    You may even be able to use a smaller cheaper transistor! It's only 5 leds..
    Also note that they only 'kind of' flash to the volume being high!

    Martin
     
  10. Anon_41854

    Anon_41854 Guest

    hi,
    ok i will test it and hope it works, but i will probably order board cus i am getting familiar with eagle and stuff, board will be cheap in china there is one sidedd pcb few buks :) as far as resistor go i have plenty .. Bulk order :)

    Question about trim resistor how to wire it? do i wire it between 2 pins (middle and left or right) and leave one side pin empty or ..?
     
  11. Martaine2005

    Martaine2005

    3,085
    849
    May 12, 2015
    Hi,
    It would depend on the trim pot.
    For the small rectangular pots with the adjustment screw, I would connect the screw side to the centre wiper and the other to the circuit.

    [​IMG]
     
  12. Anon_41854

    Anon_41854 Guest

    hi,
    i get it, i just order few leds and when i get them i will test.
    One more queston which diode i put between base and emitter?

    Thanks for your help

    Have a nice day
     
  13. AnalogKid

    AnalogKid

    2,425
    690
    Jun 10, 2015
    The diode *across* the base and emitter can be just about anything - 1N4002-4007, 1N914/1N41478, etc.

    ak
     
  14. Anon_41854

    Anon_41854 Guest

    hello
    i have few 1N4148 at home, so it shold be fine.
    Thanks :)

    Gregor
     
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