semiconductor said:Your transfromer would be 220VAC to 15VAC (after Bridge rectifier, the output DC voltage will be multiplied by sqrt(2))
Then, you can use LM317 to regulate your output DC Voltage. If you need more current (2A), you can add a power transistor, such as 2N3055 or 2N2955 (check in datasheet to get N-type or P-type).
For specific circuit diagram, download LM317 datasheet, it is accompanied with some useful circuit diagram!
For filter, use 2.200 uF for 1A (so 2A is 4.400 uf)
A 50 Hz, 15v RMS AC voltage is, as Semiconductor pointed out, 21v peak. The bridge rectifier will drop about 1.6v, leaving 19.4v peak. The ripple, with 4400uF, will be 3.5v, leaving only 15.9v at the valleys of the ripple. The LM317 needs about 3v of headroom, so you could only get about 13v maximum out of the supply. You should use an 18v RMS transformer and a 10,000uF capacitor. Be sure you pick rectifiers that can handle more than 20 amp peak repetitive current.semiconductor said:Your transfromer would be 220VAC to 15VAC (after Bridge rectifier, the output DC voltage will be multiplied by sqrt(2))
Then, you can use LM317 to regulate your output DC Voltage. If you need more current (2A), you can add a power transistor, such as 2N3055 or 2N2955 (check in datasheet to get N-type or P-type).
For specific circuit diagram, download LM317 datasheet, it is accompanied with some useful circuit diagram!
For filter, use 2.200 uF for 1A (so 2A is 4.400 uf)