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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 RobinM[/i] [br]Dear electronic-friends, I'm trying to charge a 12V, 90amp / hour battery with the "Car battery charger project", I've builded and tested the circuit but, have some problems: 1) the output voltage is immediately 14.5V (Charging voltage) without pushing on the button 2) My LED lights contineous up ==> so my push button has no effect and it has to because later I want to replace the button with a transistor circuit to start the loading proces with a µController could someone help me? Thanks already for a reply grtz Robin (excuses for my language I'm a student from the Netherlands) [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.