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What is Vss and Vdd pin in 4001 CMOS chip ?

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em00guy

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Im a newb having some issues with a circuit. Im creating a touch switch using this circuit here: https://www.paia.com/touchsw.htm The problem is that that the 4001 cmos chip has a vss and vdd pin that i do not see in this schematic. Does this mean that i do not need to connect these pins. And for that matter, precisely what is vss and vdd. I also see a v+ connection to pins 12 and 13 trough a 680k resistor, how does this differ from the cmos power supply. Thanks Alot and i apoligive for my newbiness.
 

Touch Switch

vss is ground, and vdd is power. In the schematic, conncetions to power are implied, so yes, you must make connections to your power rails.It mentions in that article that anything from 5-18V should be acceptible. Most just use +5 for vdd and GND for vss.
 

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    em00guy

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Re: Touch Switch

This switch produces only a pulse of certain duration and short after you take your finger of the plate will go off too. So if you think that you will turn somethng on the answer is yes but only for a while.
Normally, a switch when touched once activates the output (ON) and when touched again disactivates the output (OFF).
Maybe you would prefer this option?
 

Re: Touch Switch

IanP said:
This switch produces only a pulse of certain duration and short after you take your finger of the plate will go off too. So if you think that you will turn somethng on the answer is yes but only for a while.
Normally, a switch when touched once activates the output (ON) and when touched again disactivates the output (OFF).
Maybe you would prefer this option?
Click to expand...

Thank you for your help every one. The switch is only an input to a microcontroller. so it need not stay high.
 

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