grnsky Posted February 22, 2009 Report Share Posted February 22, 2009 Hi! Thanks to this forum, I have completed the stuffing of my CORE and DIN from Smash TV. But I'm a little confused about the power supply. I read the Connections Table on this site: http://www.avishowtech.com/mbhp/mbhp_coreR4d.htmlIt says "Either the output of a 7V-10V transformer, or a wall adapter can be used. 500 mA is recommented, especially if a backlit display is used". 1. How do I determine whether I want to go higher or lower within that range of 7V-10V? 2. After I have my power adapter, do I just solder the adapter right to J1 like it says and that's it? Obviously I'll want to put a socket and on/off switch in between, but I mean, do I need the +/- of the power to touch anything else on the board or just J1?3. If I have no LCD, do I just check it all out with a multimeter and if all is right, assume it's good to go for the software stage? Quote Link to comment Share on other sites More sharing options...
nILS Posted February 22, 2009 Report Share Posted February 22, 2009 1. Either will work. I personally am a big fan of 9V PSUs as they are incredibly easy to find.2. Yes, to J1 only. And pretty please use a socket and switch ;)3. Yes. Quote Link to comment Share on other sites More sharing options...
grnsky Posted February 22, 2009 Author Report Share Posted February 22, 2009 Great answers, thank you! One more thing...how do I figure out what kind of fuse I need. There's nothing about that on Smash Tv website since it's probably more of an optional thing, but I've ready it's a very good idea. Any suggestions? Does it depend on the size of the PSU? Where do I buy one and do I put it before/after the on-off switch? Quote Link to comment Share on other sites More sharing options...
cimo Posted February 22, 2009 Report Share Posted February 22, 2009 fuse? as long as you don t have a maxi MBLC with lots of LCDs and motorfader you may skip the fuse thing.Otherwise you just need to calcultate how much current you are drawing example:(some random numbers here)lcd= 200mAcore=50mAi/o chain= 200mAtot= 450mAlet s make it in power= 450mA x 5v =2250mWlet s calculate current for 220volts (europe): 2250mW/220v = 10mATake it double, you need a 20mA fuse!The fuse should go between switch and main Quote Link to comment Share on other sites More sharing options...
m00dawg Posted February 23, 2009 Report Share Posted February 23, 2009 I should point out too that a fuse is good for testing (accidental shorts, that sort of thing). In fact, you could use a few if you're building your own PSU. They're generally cheap, and can save your components (and/or your transformer). Quote Link to comment Share on other sites More sharing options...
nILS Posted February 23, 2009 Report Share Posted February 23, 2009 While m00dawg is correct and fuses are a good thing - have you ever seen a fuse in a 9V powered device? ;) Just saying... You definitely want fuses when you're working with mains. Quote Link to comment Share on other sites More sharing options...
m00dawg Posted February 23, 2009 Report Share Posted February 23, 2009 Haha well good point. If you're using a wall-wart then it's hard to use a fuse on the main-side of the transformer. I always went without but I also broke at least 2 wallwarts and a C64 PSU supply (I'm sure it's a fuse, but I'm not going in through all that epoxy to find out :). I guess my point is to be a little more careful when dealing with a non-fused supply. Quote Link to comment Share on other sites More sharing options...
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