Electronics


Switches

Digital Active High

+5V---o \o---DIO---R---GND


Digital Active Low

+5V---R---DIO---o \o---GND


Digital Logic Gates

AND

AND:  input passed; HIGH = ON

NAND

NAND:  input inverts; HIGH = ON

OR

OR:  input passed; LOW = ON

NOR

NOR:  input inverts; LOW = ON


Toggle

SPST, SPDT, DPST, DPDT, DPDT center-off


Pushbutton

SPST-NO, SPST-NC


Notes

SPST:  Single Pole Single Throw
SPDT:  Single Pole Double Throw
DPST:  Double Pole Single Throw
DPDT:  Double Pole Double Throw
 
Momentary-contact:  Press and hold to turn on, release to turn off.
Maintained-contact:  Press to turn on; press again to turn off.
 
Single Throw
NO (Normally Open):  Contacts are open when the switch is not actuated.
NC (Normally Closed):  Contacts are closed when switch is not actuated.
 
Multiple Throw
BM (Break-before-Make):  The moving contacts break an existing connection before making the new connection -- Nonshorting type.
MB (Make-before-Break):  The moving contacts make a new connection before breaking the existing connection -- Shorting type.

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DISCLAIMER

Page author: Dawn Rorvik (rorvikd@evergreen.edu)
Last modified: 05/20/2003