Very odd...

[jonathand1000]

hi,
I've got a circuit wired up on a breadboard. For a switch, I smiply put in two wires that are touched together to ake the connection. However...I find that when I am near electronic equipment (that is turned on, of course), all I need to do is put my hand near the circuit and it switches itself! (Actually, it does sometimes. Others, it just has random effects on the circuit) Can anyone explain this?

Thanks,
Jon

 

[Roff]

You need to post a schematic. Do you have a CMOS input? Did you put a pullup or pulldown resistor on the "switch"? Or, do you have other floating CMOS inputs? All unused inputs (and switched inputs) must connect to either +V or ground (circuit common).