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I'been doing a PISO shift register using a 74LS166, but I get no results, I don't know what is happening. Here is the top view and my approach.

In my approach:

  • BLUE wire = Clear
  • PURPLE(MARRON) = Clock Pulse
  • YELLOW = Clock Inhibit
  • GREEN = Shift/Load

As you guys can see there is a space in the first place. There I have to put the serial input but i don't where I have to connect it.

Hope you can help me to make it works. Thanks in advance.

enter image description here

My approach

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closed as unclear what you're asking by Voltage Spike, Bence Kaulics, Daniel Grillo, Dave Tweed Aug 20 '16 at 12:59

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    \$\begingroup\$ I guess nobody will know what do you want. \$\endgroup\$ – Marko Buršič Nov 15 '15 at 7:24
  • \$\begingroup\$ @MarkoBuršič I want to implement a PISO swift register, the second picture is what I have done, but it doesn't work. I am confused with the serial input. I don't know what kind a signal (LOW or HIGH) it has to have. \$\endgroup\$ – Manuel Nov 15 '15 at 7:28
  • \$\begingroup\$ I depends on what you want to get after you have shifted the whole 8 bits, if you want 9th bit to be L then it has to be L, if you want H, then let it be H. \$\endgroup\$ – Marko Buršič Nov 15 '15 at 7:44
  • \$\begingroup\$ @MarkoBuršič Ok, I already put in L. Now, to load the 8 bits on the parallel input. What I have to do with the clock and the clock inhibit??. When I push the clock it seems that nothing happens. \$\endgroup\$ – Manuel Nov 15 '15 at 7:48
  • \$\begingroup\$ that layout looks ok what switches and buttes are you switching inwhat order? \$\endgroup\$ – Jasen Nov 15 '15 at 7:50
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  1. set clk inhibit L, set Clear H,
  2. set parallel inputs.
  3. switch shift/load to L
  4. apply pulse to CLK
  5. switch shift/load to H
  6. apply pulses on CLK
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  • \$\begingroup\$ Marko, thanks a lot, the LED is lighting. I'm so gratefull \$\endgroup\$ – Manuel Nov 15 '15 at 8:03

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