PC Serial Port Receiver

  
This circuit was designed to control a 32 channel Christmas light show from the PC serial port. Originally designed with TTL logic, it has been simplified using CMOS circuits to reduce component count. It is a fairly simple, reliable circuit that requires only 4 common CMOS chips (for 8 outputs), an optical isolator, and a few discrete components. The schematic diagram (SERIAL.GIF) illustrates the circuit with 16 outputs which can be expanded with additional 8 bit shift registers.
PC Serial Port Receiver - schematic



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News


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  • PR Web (press release)
    The operator then places the required case components into the first assembly dial; the stations on the dial will snap the components together, laser-etch the product information, and process checks. The assembly is then transferred to
     7 December 2016
  • Elektor (blog)
    Elektor (blog) This is ideal for products in which boards are mounted at different angles to each other and there is no requirement for ongoing flexibility. The circuit board only needs to be bent into the desired shape once, during assembly
     28 July 2016
  • The Verge
    The Verge Amelia shot reportage photos of each stage of the process and mountains of discarded TVs, , cell phones —even an Apple II, complete with box. ... 99% of that was recycled; the remaining 1% was reused in some fashion or added t
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  • Computerworld
    Computerworld For example, Georgia , the University of Tokyo and Microsoft Research have all created printable circuits over the past two years. One company, called Bare Conductive, has ... Mac and Linux operating systems. It connects to a v
     17 February 2015
  • The Economist
    and jobs, algorithmsSIR — “Meat and greens” (January 18th) was a valuable contribution to the debate on environmental issues regarding livestock. However, the article gave the impression that the only way to reduce greenho
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  • and reveal exactly what goes into everything from an ...
    Daily Mail
    Daily Mail we rely on every day - and reveal exactly what goes into everything from an ...... logic boards and the image sensor itself, LCD screen that displays images, and the lens that focuses the image. The various control buttons we
     17 May 2013

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