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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 MARK KILBURN[/i] [br]how to control pulse width of a -15vdc pulse train @ 20khz Help needed to control the pulse width of a (negative) -15vdc pulse train at 20khz.. Basically, the pulse is as described in the picture attached which is of the pulse itself all details are within picture. [img]http://images.elektroda.net/57_1295733313.jpg[/img] I will not need to vary the frequency only the pw.. I would like to use something very simple... I have been searching everywhere. However, most designs are base on negative going pulses on a +dc supply and not on a wave form that actually goes positive from a negative -15vdc supply..... please idea's would be great appreciated. Ps: The pulse train controls a fet driven NEG Dc chopper circuit (high current) Thanks to all who take the time to at least read this post. (Edit...Fix images) [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.