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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 n/a[/i] [br]please take a look at the following circuit and tell me what can I do wrong. My problem is that the dome lamp stays always on even the current at pinout 6 of the IC decreseas. Could the transistor be broken? Do I MUST use variable resistors? Normal 220K and 10K resistors won't work? And one more. Where should i bond the base of the transistor?? Before the 10K or after? Thank you. [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.