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== Pull Down and Switch ==
 
== Pull Down and Switch ==
Use this circuit when you want to feed a user input to a digital circuit, for example a PIC input pin. ( like the Pull Up and Switch )
 
 
Essentially a Pull Up and Switch "upside down".  A pull down is a fairly high value resistor (say 1 to 100 K ohms) that is connected to the ground side of the power supply.  This makes the other end of the resistor ground as well. (as long as it is connected to a high impedance).  The other end of the resistor is connected to a switch that is then connected to positive side of the power supply.  When the switch is connected current flow through the resistor raises the voltage to the digital circuit to entire power supply voltage the input is now 1 (sometimes called active high, since when the switch is active the output is high ).  Pull down is sometimes used without the switch to keep a signal low all the time.
 
 
 
 
Circuit:
 
Circuit:
 
[[Image:pds.png | Pull Down and Switch ]]
 
[[Image:pds.png | Pull Down and Switch ]]

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