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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Ashirdaniel[/i] [br]I'm making an audio amplifier on 12v 5amp supply. But when I connect it with the power supply, the speakers are making some buzzing sound. It wont go high when increasing volume and won't decrease also. I connected my amp board with another supply of 1 amp and it doesn't have that problem. It was a f full bridge supply without centertap. I'm using a 12v dual 5amp supply. For this amp, I connected just *12v and 0. ( I didn't used the negative part) . So what is the problem and if I want to make another supply, which circuit should I use. Half Bridge rectifier with two diodes or full bridge with four diodes. I have a 12-0-12 5 amp transformer. [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.