The power supply can be done with his hands from available and inexpensive components for 10 minutes if not use solder, and apply the breadboard. The most simple, but at the same time a reliable power supply consists of a transformer, rectifier, filter, and integrated voltage regulator. Optionally, you can supplement the LED indicator or a voltmeter. The transformer is used to reduce the mains voltage to the desired value. The rectifier converts AC voltage into a pulsating, which is smoothed capacitor filter and takes the form of an almost constant voltage. In order to have a stable output power voltage unit, after the filter set voltage regulator LM7805, LM7809, LM7812, etc. In the stabilizer input is unstable voltage and the output is stable. The first two "78" numbers indicate that the regulator output voltage is positive. If you use "79" digits, the voltage is negative. The last two digits indicate the magnitude of the output voltage stability: 05 - 5 V, 09 - 9, 12 - 12, etc. Rated power supply load with the use of such a stabilizer 1 A. If the unit is low power supply, load current up to 100 mA, then apply a series of voltage regulator 78L05, 78L09, 78L12. Explanation of markings similar to the previous one. Thus, in order to collect their own hands the power supply to the correct voltage, sufficient to take the appropriate voltage regulator, transformer and the electrolytic capacitor. The rectifier can be used in almost any.
Power supply 5 V: the transformer 6 ... 8, the capacitor is suitable capacity 100 ... 1000 uF 16 V, LM7805 regulator or 78L05.
Power supply 12 V; Transformer 12 ... 15 V, the capacitor 100 ... 1000 uF 25 V, LM7812 regulator or 78L12.
Power supply 24 V; transformer 24, capacitor 100 ... 1000 uF 50 V, LM7824 regulator or 78L24.
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