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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 richardc[/i] [br]Hi - Very new to this subject so apologies for such a basic question but here goes- I am currently building a circuit from this website which is a timed relay. Basically its a 555 timer IC used to control the time interval (on time) of a relay. The circuit diagram aaron publishes indicates 12v which is fine - except that I am trying to install this timer inside a piece of existing equipment which seems to run at just 3v off its own internal transformer. - so presumably I need to run the new timer off its own little battery - or install a whole power supply for it. Just to complicate the issue, the existing transformer inside the unit is really poor construction ( made v cheaply in india ) and really I ought to be replacing that as well. Is there an easy way to install a new power supply that can serve both voltages 12v and 3v ?? Thanks a lot!! Richard [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.