Digital RCA control box

Discussion in 'General Electronics Chat' started by moorejohn90, Aug 3, 2013.

  1. moorejohn90

    Thread Starter Member

    Dec 9, 2011
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    Hi, I wanna make RCA multiplexer switch box with the controlled of micro-controller for instance of manual rotary switch. What kind of ic should I use. I want to route RCA signal from the two of my satellite receiver and one of dvd player to a tv. thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    Depends on the type of signals and connections.
    What is the connection between the DVD player and the TV?
    I will assume that this a single coax cable but I could be wrong.
    I would use reed relays. Since you have three input sources, you will need two SPDT (single-pole double pole) switches, i.e. each reed relay selects one of two signals.
    Connect the two relays in series and you will be able to select one of three signals.
     
  3. moorejohn90

    Thread Starter Member

    Dec 9, 2011
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    Hi, The type of cables these are coming from all of devices are Yellow,Red and White cables (not single coax cable) and also to TV are these three. Any advice?
     
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    You could use three multiplexer chips CD74HT4066.
     
  5. moorejohn90

    Thread Starter Member

    Dec 9, 2011
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    Hi, thanks for all of your reply. GopherT.. I can't find that kind of chip on the internet. Can I used any multiplxer chip with any challel. Because some chip shows for digital and some for analog. I found these:CBT3244A,CD4066,74157,74153 and TS3A5017.Are they possible to use?
     
  6. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Yes, sorry. Best is to connect a bilateral analog switch as a multiplexer. CD4051be is the right chip.
     
  7. crutschow

    Expert

    Mar 14, 2008
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    I don't think a CD4051 will work. Component video signals are 75Ω so you will need a switch that has no more than a few ohms ON resistance. The CD4051 has over 100 ohms of ON resistance so will seriously attenuate the signal.
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    It was common to use those quad analogue switch IC's in TV's to switch between AV inputs (well it was common on CRT TVs anyway).

    I've had to replace a few and they were just off the shelf 40 or 74 series quad analog gates. I think they were about 40-50 ohms when on.

    So that works fine on AV inputs but I don't know if that would still apply for component video? Maybe he could put a 50 ohm resistor in series with a component video signal and see if/how much it affects the picture?
     
    Last edited: Aug 5, 2013
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