Pearl Posted April 20, 2003 Report Share Posted April 20, 2003 Hi there ...I got some questions about power supply of midiboxes.I want to build a complex Midibox like shown at picture.For this I want to use a central power supply. Is ist possible to do something like this?If it is OK, how much has the current of the transformator to be for this? ( At pdf's I found that every Core-Module needs ~ 500mA and the MF-Module needs 1A, but in summery, I think it's too much)I would calculate, that max. 70% of LEDs and MFs are used at the same time.Could it be that the current is too much for one MidiBox,because I want to build and test moduls one by one? (Some years ago I destroyed a pcb while using a bigger transformator than the original.)Thanx for any information Bye Pearl Quote Link to comment Share on other sites More sharing options...
TK. Posted April 21, 2003 Report Share Posted April 21, 2003 Hi Pearl,I don't have so much experience with transformers, but the circuit looks good (well balanced). To the seperate supply for the displays: should go to the backlights only (draws 100mA and more), and not to the general +5V input of the displays (draws just only ca. 1mA). On this way you will not run into trouble with the polarities.Motorfaders: 2 x LM317 have to be used for 16 faders due to the max rating of the LM317 (if you are using the original MF layout, you will do this anyhow). A power consumption of 1A per 8 faders is very common when you switch to a new song and all faders are moving to a new position. "Current too much": yes, thats the other side.... I would recomment fuses (buy 10 or 20 at once!). Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Pearl Posted April 21, 2003 Author Report Share Posted April 21, 2003 Thanx ...Ok, at the beginning I'll take a small one. If it is too small at the end - no problem to change.Wich kind of fuses are recommended?- quick or slow (in german "flink oder träge")Bye Pearl Quote Link to comment Share on other sites More sharing options...
TK. Posted April 21, 2003 Report Share Posted April 21, 2003 I would prefer the slow one, so that peaks don't blow the fuseBest Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
jasper81 Posted April 21, 2003 Report Share Posted April 21, 2003 make sure yur transformer can also deliver the power.. Most cheap transformers can't handle high currents Quote Link to comment Share on other sites More sharing options...
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