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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    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
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