PC Serial Port Receiver

[ibrsel]

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.