![]() The leds light up all right, but I thought this circuit would produce a shift on the register each time I set the strobe line from low to high, but instead it seems the register shifts continuously when the strobe line is low, and stops when it is high. Register pin 1 (input A) and the master reset pin are tied high. ![]() Then I connected register pin 8 (clock pin) to pin 1 on the parallel port (strobe line). ![]() I would like to control the shift register using a parallel port and so I have tied register pin 2 (input B) to pin 14 on my parallel port (Autofeed line). I have this on a breadboard, and I'm using a computer power supply for the 5 volt power to the register and the leds. Hello everyone! I'm fairly new to electronics and have been experimenting with an 74LS164 serial shift register ( and 8 leds (with resisters in series) on the register outputs (leds on when register output is low).
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