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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]i use 4013 connect to a transistor(1815) ,then use 1815 to turn on the relay to control an A.C. appliance. i press a button give a clock pulse to 4013,then the output of 4013 is holding in positive voltage,when i give 2nd clock pulse to 4013,the output of it will retun to 0v,this output is connected to the base of 1815,emitter of 1815 is connected to ground voltage,collect of 1815 is connected to one side of the relay coil,the other side of coil connected to +9v,then i give 1st clock pulse to 4013 the relay is turn on,but i give 2nd clock pule to the 4013, the relay cant turn off and it is holding why ? thanks [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.