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In line switch with led indicator

Discussion in 'General Electronics Discussion' started by Graham Bell, Mar 16, 2017.

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  1. Graham Bell

    Graham Bell

    3
    0
    Mar 16, 2017
    I am a musician and have used and made simple repairs and adaptations to PA and guitar amps , mostly signal cables and switches, but beyond simple soldering and the like I have no experience. I am using an iPod through a PA to play drum tracks during live performances. Selecting tracks between songs the audience can hear the clicks from the iPod as I scroll through track titles and it doesn't sound very professional. I wonder if it is possible to put a switch in the cable from the iPod to the amp so that I can mute the iPod at these times. I would need the switch to have an led indicator so that it would be obvious whether it was live or muted. The stage in a live gig is often a very dark environment and I don't want to have to depend on memory or touch when I go to start a drum track. I realise the led will need power but if I put a battery in the circuit, what will it do the audio signal? Thanks in anticipation of some tips!
     
  2. Externet

    Externet

    754
    164
    Aug 24, 2009
    Try a double pole double throw switch; one set of contacts branch for the LED indication from 9V and the other set of contacts branch of the switch to ground the audio line for muting.
     
  3. AnalogKid

    AnalogKid

    2,458
    705
    Jun 10, 2015
    Three poles - the ipod signal is stereo.

    ak
     
  4. Graham Bell

    Graham Bell

    3
    0
    Mar 16, 2017
    Thanks for that guys - would it be too cheeky to ask for a quick diagram? The lead from the iPod has 2 phono plugs at the mixer end, so was thinking a small project box with the phonos in, the switch, led and the battery in the middle and either a stereo mini jack socket or another pair of phonos out to the mixer?
     
  5. Externet

    Externet

    754
    164
    Aug 24, 2009
    If stereo :

    Ipod L. channel >-------------------------. /.---------------------------------------------------> Mixer L.
    Common--------------------------------------G------------------------------------------------------ground
    Ipod R. channel >-------------------------. \.---------------------------------------------------> Mixer R.

    9V Bat(+)--------------------------------------./ .-----------\/\/\/\--------------|>|-----------Bat(-)

    The resistor \/\/\/\ should be around 680 Ω.
    All switches move simoultaneously. In one position, mixer side L & R are grounded to G as drawn. In the other position, mixer side L & R are connected to L & R ipod respectively and ground G left open.

    The switch may look like
    ----> http://www.led-switch.com/Toggle_switches/Miniature_Switch/3PDT_C_Off.jpg

    For monophonic;

    Common------------------------------G------------------------------------------------------ground
    Ipod audio >-------------------------. \.---------------------------------------------------> Mixer in.

    9V Bat(+)--------------------------------------./ .-----------\/\/\/\--------------|>|-----------Bat(-)

    And the switch may look like :
    ----> https://www.mgsuperlabs.co.in/estore/image/cache/data/MGSL/push to on off switch-500x500-500x500.jpeg
     
    Last edited: Mar 17, 2017
  6. Graham Bell

    Graham Bell

    3
    0
    Mar 16, 2017
    Can't thank you enough folks, will have a go.
    Cheers.
     
  7. Audioguru

    Audioguru

    3,085
    692
    Sep 24, 2016
    An ordinary switch is designed for 120VAC/5A electricity, not low voltage and low current audio. Its contacts are silver for 5A and they soon tarnish and rely on the high voltage and high current to burn away the tarnish. With audio the silver contacts soon tarnish then do not work.

    Switches made for low level audio have gold plated contacts because gold does not tarnish. The gold is thin (high voltage or current will burn the gold away) so the switch costs the same as with silver contacts.
     
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