LM317

This circuit is for a 1.5 Volt 0.5Amp power supply using the LM317T Adjustable Voltage Regulator.
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Read More Source:
http://home.cogeco.ca/~rpaisley4/PSupply.html
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The dual rail supply which means there are two supply voltages, one positive, one negative, that are adjusted by a common potentiometer such that supply voltages are equal in magnitude. It is capable of supplying up to +/- 15V DC at up to 1A.
Two linear regulators are used, an LM317 on the positive side and [...]

This is a 1.2 - 12 V, max 1A power supply with a low voltage indicator LED. The indicator part incluedes three diodes and one LED. For example you are charging a battery, you can observe the charge status at that moment. Another advantage of this circuit, when the drawn current exceeds 1A (practically 0.85A), [...]