zenon Posted August 11, 2004 Report Share Posted August 11, 2004 how can I scale this project's:http://www.electronics-lab.com/projects/pc/021/index2.htmlcircuitry to control only 3 fans? at the very most this is all I will need and the "randomizer" is of no use to me.this is the original circuit... Quote Link to comment Share on other sites More sharing options...
zenon Posted August 11, 2004 Author Report Share Posted August 11, 2004 this site plays wonky tricks with the image size..... pls save and view off your HD.here is my guess @ a 2 channel variation. Quote Link to comment Share on other sites More sharing options...
zenon Posted August 11, 2004 Author Report Share Posted August 11, 2004 TIA. Quote Link to comment Share on other sites More sharing options...
MP Posted August 11, 2004 Report Share Posted August 11, 2004 The site shrinks the size of images which are too large to view. When you click on the file name, you will see the enlarged view.If you only want three fan sections on this schematic, just use sections D0, D1, and D2. Then you should change the control software so that it only sends a signal to these ports to activate the fans.MP Quote Link to comment Share on other sites More sharing options...
zenon Posted August 12, 2004 Author Report Share Posted August 12, 2004 the green points to the branch that bothers me... I don't want the strobe function @ all.can I just "erase" what's circled in green?I live in canada, where would you suggest I get this stuff from? digikey has a cdn catalogue for sure.... not sure if jameco needs to go through the USA or not.thnx. Quote Link to comment Share on other sites More sharing options...
GPG Posted August 12, 2004 Report Share Posted August 12, 2004 Ground the emitters of the 547s if you remove strobe Quote Link to comment Share on other sites More sharing options...
MP Posted August 13, 2004 Report Share Posted August 13, 2004 Yes, as GPG has stated. The strobe, which is active low causes a connection of all stage emitters to ground. If you do not use this, then you can simply tie the emitters of the BC547s to ground.If you have an outlet to digikey without crossing customs, I would recommend that you use it. I have had only good experiences with digi-key.MP Quote Link to comment Share on other sites More sharing options...
zenon Posted August 13, 2004 Author Report Share Posted August 13, 2004 Yes, I already have the paper (phonebook size!) catalogue..... all shipped within canada :)thanks so much for the help complete retard when it comes to EE. Quote Link to comment Share on other sites More sharing options...
zenon Posted August 31, 2004 Author Report Share Posted August 31, 2004 okay I've picked almost all my parts... except I'm not sure about the capacitors, fuseholder and printer port connector.I have picked these:100nF cap:D-Key.ca P\N: 511-1186-1-ND10uF cap:D-Key.ca P\N: 399-1614-1-NDsince I can't find any cheap caps to replace the 100nF cap that are available in quantities less than 10 I was thinking of just using all 10 as a power supply..... or maybe I'll just slap them in the cmoy-AMP I'm building :-\ Quote Link to comment Share on other sites More sharing options...
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