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24 | Section 2
ing it from the output to the +5v source on pin 8. An appropriate value is 2.2kΩ.
Sink (pull-down) current must be limited to 400mA maximum per output with total
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output restricted to 1 amp (200mA each output if all five will be used).
If you want to drive a relay, lamp, or high-current LED, you will need an external power source.
Connect your external power source negative to Nx12 ground at pin 1 and positive to the relay.
e other side of the relay goes to the output pin. (e Nx12’s +5v output is fed through a 100Ω
resistor and a 50mA fuse, so cannot source much current.)
2.11 AC (mains) Power
e AC receptacle connects mains power to the unit with a standard IEC (International
Electrotechnical Committee) power cord and provides an on/off switch. e power supply has a
universal AC input, accepting a range from 100 to 240 VAC, 50-60 Hz.
IMPORTANT SAFETY INFORMATION
Surge Protection
Precautions should be taken to prevent damage caused by power surges. Standard line surge
protectors can be used to offer some degree of protection. It is the user’s responsibility to ensure
that protection adequate for their conditions is provided.
Grounding
is equipment is designed to be operated from a power source which includes a third ground-
ing connection in addition to the power leads. Do not defeat this safety feature. In addition to
creating a potentially hazardous situation, defeating this safety ground will prevent the internal
line noise filter from functioning.