computer Posted March 4, 2004 Author Share Posted March 4, 2004 ah I read about fusing.... I think that if you blow the fuse on an output you usually blow the triac too (due to shorting, etc)... however, I will probably have a seperate controller board linked to the optos and triacs, etc by spade connectors or something for easy replacement... Link to comment Share on other sites More sharing options...
Jivemaster Posted March 4, 2004 Share Posted March 4, 2004 Choose a fuse with an I2t let through lower than the fusing I2t of the triac then the fuse protects the triac. its pointless protecting the fuse with a triac. Link to comment Share on other sites More sharing options...
Mush Posted March 4, 2004 Share Posted March 4, 2004 FF fuses usually cost more than a triac, use PCB mount terminal block for connecting triac, leaving field servicable with a screwdriver. Use as big a triac as you can get 800V 25A sort of thing for your 5A 240V dimmer. Triacs behave badly with the surge of an arcing out dying lamp, alternistors behave better and are more robust or reverse parallel SCR in a big enough rating will be pretty much bombproof.Cost goes up with choices Its the chokes, boxes, heatsinks and connectors that actually add the cost, the firing card costs nothing.... Link to comment Share on other sites More sharing options...
computer Posted March 14, 2004 Author Share Posted March 14, 2004 erm, could you make a custom dimmer, say 3 dim channels and 3 switching suitable for a permanent installation? would you want something so that if all the signals are less than 0.1v turn off all the output parts via relay? would that be a good reason to make one, say for a garden... mount it indoors, and you can have loads of sensors, switches, etc low voltage hooked up to it... Link to comment Share on other sites More sharing options...
Guest lightnix Posted March 14, 2004 Share Posted March 14, 2004 Have you tried looking on E-bay ? There's all sorts of kit pops up on there (although some of it may be dodgy / nicked). Once you've factored in the cost of your time building, testing and debugging, it may well work out cheaper to buy something. Link to comment Share on other sites More sharing options...
computer Posted March 15, 2004 Author Share Posted March 15, 2004 would be good prohject though. also, I found velleman do a premade or self-solder dimmer unit with 0-10vdc in and PWM control of the 240v output... Link to comment Share on other sites More sharing options...
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