This is the voltage converter to get the voltage of ±5V
from the input voltage of ±12V. I am using the 3 terminal voltage
regulator for the voltage to be changed in this unit. As the regulator,
LM317 is used for the positive voltage and LM337 is used for the negative
voltage. The output current can make output in 1 A.
The point of this unit making is the radiator (the heatsink) of the
regulator. The regulator becomes hot when outputting the 1 A electric
current and when there is not a heatsink, the regulator
breaks.
The merit of the regulator of this type is
what little noise occurs and is cheap and there are few use parts. The
demerit is the thing with the conversion efficiency which isn't good. When
outputting from 12 V to 5 V, the efficiency (the output power/input power)
is 42%. Recently, the switching regulator became cheap. The number of
parts increases little but in case of more than 1 A power supply, you had
better use the switching regulator with the good efficiency.
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