Page 110 - Testing Electronic Components

between 7V to 38V will cause the voltage regulator to produce a steady 5
V output. Do not exceed the 38 V rating otherwise the voltage regulator
may burn. You may check from the internet or any semiconductor data
book (preferably ECG master replacement guide) about the specification
of any voltage regulator. Some famous part number uses in electronic
circuits are 7805, 7812, 7905, and 7912. Part numbers that start with
78XX have positive output while the 79XX series have negative output.

For your information the input voltage must have at least two volts higher
than the input voltage. That’s mean if you want to get a 12 V output from
a 7812 voltage regulator, the input voltage have to be at least 14 V and
above. Don’t expect to use a 5 V dc input to produce 12 V output, this
way won’t work!

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