"The 4015 contains two independent 4-stage shift registers and require clock and data signals (along with a reset input which may be implemented or not depending on requirements). I wired the data input with a single-pole-double-throw-centre-off switch so that you can input a logic HI, logic LO or external data flow - in the Up position, the input is tied HI, in the mid position the input is pulled low by the pull-down resistor and in the low position the external input is connected. I also made use of small 5-way rotary switches to give a switchable-select-output - but its hard / expensive to get such switches.."via BugBrand
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