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  1. C

    5 second delay System

    If there is a video conferencing system being installed somewhere it needs to be tested. We have a VC system set up in our office, purely for testing purposes. If there is nobody in the office we want to still be able to test a newly installed VC system. We can do this by calling the system set...
  2. C

    5 second delay System

    Thanks, A computer isn't really practical for this operation though. Its for work, it needs to work if there is no one in the office. We only have lap-tops, they are often taken out to jobs if you know what I mean? We just wanted a bread board or something set up able to do it at any time...
  3. C

    5 second delay System

    hi all, I want to make a circuit that will take in Stereo audio from a system, then delay it by 5seconds and play it on a speaker through an amp. Any ideas? Thanks. Nialll
  4. C

    PCM Speech CODEC

    I'm using a 2 D type flip flop's. I dunno if my diagram will appear, hopefully it will, i'm new to all this. The chip i'm using is a 74LS74, i'm using a 10K square wave pulse. If my diagram posts, I was originally using the  output C1 from between Q1 and D2. I have now changed it bit I think my...
  5. C

    PCM Speech CODEC

    No we have to built everything, well I think we can buy certain parts if we're really stuck, not sure though. How do you shift the phase back upstream? As the name would suggest, I really am quite clueless.
  6. C

    PCM Speech CODEC

    Hi All, I'm currently doing a project for college, Design of Switched capacitor filters for a PCM Speech CODEC.  I am to use a biphase clock to drive the switches on the capacitor. This is where my problems begin. I do not know how to design a biphase clock, I was told to use a johnson counter...
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