power supply regulator 0-28V 6A/8 Amp By LM317 and 2N3055

By Guy, de ON6MU

This is an easy to make power supply which has stable, clean and regulator 0-28V 6A/8 Amp output voltage. By using two 2N3055 transistors we become more then 2 times the amount of amps then the power supply delivers, making it real though to brake ;). Although you could use this design to deliver 20 amps ((with almost no modifications and with a proper transfo and a huge heat sink with a fan), I did not needed such much power. Make sure you mount them on a huge heat sink, as the 2N3055 transistors can get very hot at full load.

Although the 7815 power regulator will kick in on shortcircuit, overload and thermal overheating, the fuses in the primary section of the transformer and the fuse F2 at the output will secure your power supply. The rectified voltage of: 30 volt x SQR2 = 30 x 1.41 = 42.30 volt measured on C1. So all capacitors should be rated at 50 volts. Caution: 42 volt is the voltage that could be on the output if one of the transistors should blow.

Click to View Circuit and Read More

Read More Source :
http://users.belgacom.net/hamradio/
schemas/6-20amps_regulatable_powersupplies_on6mu.htm
Thank you.

This entry was posted on Friday, August 10th, 2007 at 1:38 pm and is filed under LM317, Power supply, Variable Regulator, high current power supply. You can follow any responses to this entry through the RSS 2.0 feed.