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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 Altru[/i] [br]Greetings! I built your Time Delay Relay using a 556 chip to control two relays. Everything is working as indicated, however, I was hoping that the trigger could be on longer than the timed delay. Let me explain. I'm triggering the chip with an external SPDT NC relay within another device. The NC feeds one side of the 556 and the NO feeds the other. Regardless of what state the SPDT relay is in, I would like the time delay realys controlled by this circuit two be energized for about two seconds, no matter how long the trigger is on. What I'm experiencing is that a momentary trigger will activate the realy with the desired delay, or a long trigger will keep the relay on for the trigger time plus the delay after the trigger is removed. Perhaps I'm asking this circuit to do something it was not designed to do? I appreciate any input! Rod [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.