durchgedreht Posted November 30, 2006 Report Share Posted November 30, 2006 Hi,I use a Roland 9V 500mA power supply from my Midi - Keyboard Edirol PSR30. I use the MidiIO128 for a midifizised basspedal. I would like to use it with Midi Phantom Power on the outer pins as i already do with my guitar midi board.Therefore I did the following:1) I added a Stereo switch that connects the two power supply cables from my CORE to either the phantom power pins or the normal power supply jack.2) To indicate the Power on each input (midi and power supply), i built a LED+10k resistor after a recifier circuit (four diodes + 10uF Kondensator). This will let the LED light even with ACDC and nop mind what polarity.What happens now is the following: I connect the Power supply and switch to it. The light will glow (the red HiGrade LED from the power supply circuit). When I connect my USB Midi Interface (Thomann 20EUR), the light will not glow any longer and the CORE will not work. When I wait about one minute before connecting the USB MIdi interface, the light will glow less for a moment, but then return and all works fine.I cannot believe, the Modules (CORE + 1 x DIN_4) will consume so much power???Also it seems the Roland Power supply is not DC as it states 12,5 V DC???Second question: Can I use a 300 Ohm resitor to ground with LED in the 5V to ground pins of the D_IN4 Module to indicate the Power of the Modules, or what calue would you prefer??? Quote Link to comment Share on other sites More sharing options...
toxictv101 Posted November 30, 2006 Report Share Posted November 30, 2006 300ohm is ok to for limitation A. in ledBut with a 10k Resistor dont think that the led will shine Quote Link to comment Share on other sites More sharing options...
durchgedreht Posted November 30, 2006 Author Report Share Posted November 30, 2006 That's what I thought first too. But it works well. Anyway my main problem is the voltage trouble. Is the power supply not sufficient? Quote Link to comment Share on other sites More sharing options...
toxictv101 Posted December 1, 2006 Report Share Posted December 1, 2006 that the power supply is AC or DC doesnt matterbecause it pass by a rectifier bridge befor go to the 78xx regulatori dont think that your power adaptaor is to smallwith your conf. ,it should not take a lot of Amp!!!! Quote Link to comment Share on other sites More sharing options...
HL-SDK Posted December 1, 2006 Report Share Posted December 1, 2006 you wired the capacitor (kondensator) in series instead of parallel, you can just clip it off because all it's doing is nothing :-D Quote Link to comment Share on other sites More sharing options...
durchgedreht Posted December 4, 2006 Author Report Share Posted December 4, 2006 It's parallel. I'm not as newbie in electrinics ;DBut thanks for a guess. I'll start using the pedalboard from friday on and will try a better switched power supply with 1A. I donn't mind waiting for 30 seconds but I don't believe the capacitor will last as long for being charged. My best guess is up to the cheap midi interface. I will try with another soundcard. It's really strange that it'll leach so much energy. But I'm not in the Midi spec. Quote Link to comment Share on other sites More sharing options...
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