Interfacing CD4051 with a AM transmitter

Discussion in 'General Electronics Chat' started by André Ferrato, Jun 23, 2015.

  1. André Ferrato

    Thread Starter Member

    Apr 5, 2015
    206
    1
    Hi, i was using an encoder from holtek, HT12E, but it has only four data inputs and i needed 6 inputs, so i went for this mux/demux (CD4051), my guess is to connect the third pin ( Z: Common in/out ) to the data pin of the 433 MHZ transmitter, is that correct ?
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    Yes, but you'll probably find that the device is too slow. -3db frequency for CD4051 is around 20MHz.
     
  3. André Ferrato

    Thread Starter Member

    Apr 5, 2015
    206
    1
    But.. this is when the IC is running on a AC power line right ? Should this be a problem if am running at a smooth DC and just connecting to the transmitter ?
     
  4. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    What are you using the MUX for? I was under the impression that you wanted to use it for switching high frequencies.
     
  5. André Ferrato

    Thread Starter Member

    Apr 5, 2015
    206
    1
    I need to transmit data over the air, for that i am using a 433Mhz pair of transmitter and receiver. I was initially using a HT12 pair of Encoder and Decoder, but they have only 4 data inputs and i needed 6 data inputs, so i went for this IC CD4051 because it has 8 inputs, but i don't know if it can be used for the same purpose as the HT12 chips. It is to light up some lights over the air.
     
  6. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,064
    3,836
    It will work for that. However, If you have the cheap eBay transmitter receiver pairs for $5 or less, be aware that there is a cheap op amp smd on the bottom and will have trouble with any frequencies of 10kHz or more.
     
  7. André Ferrato

    Thread Starter Member

    Apr 5, 2015
    206
    1
    Understood, i just bought them, still waiting to receive the pair. But i really hope i don't have problems... GopherT, the pin i should connect to the transmitter DATA pin is the third pin ?
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,064
    3,836
    Yes, the common in/out (pin 3) is correct.
     
Loading...