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 CMOS NAND gate 4011		  New Topic  Reply to Topic
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nghtcrwlr
New Member

1 Posts
Posted - Oct 07 2009 :  10:40:42 AM  Show Profile  Reply with Quote
Hello
i have recently seen a capacitive touch circuit from http://www.aaroncake.net/CIRCUITS/touch.asp

There a CMOS NAND Gate 4011 is used. and in the circuit diagram 4 terminals are connected. but the actual components has 7 +7 leads on each side. Can anyone please explain me the circuit.
Thanks


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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Oct 07 2009 :  12:36:13 PM  Show Profile  Reply with Quote
You should never leave inputs on a Cmos logic IC not connected. Connect the unused inputs to 0V.
look at its datasheet to see which pins are the unused inputs.
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 02 2009 :  11:54:12 PM  Show Profile  Reply with Quote
i checked the data sheet. and some other circuit that use the same chip. ot is fine to not use the other pins. so just wire it like the schematic says
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 02 2009 :  11:57:35 PM  Show Profile  Reply with Quote
oh btw U1A and U1B is the same chip so connect 1 2 3 and 5 6 4 7 to your NAND Gate 4011
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