Let’s remove the unnecessary resistor R11, that is easy, too: Here you see an 220 Ohm resistor mounted as R5 (sorry guys, it’s night, my SMD shop is closed). To start the modification, an input wire has to be relocated:Īs the tradition requires, least expensive and least termosensitive details are to be mounted to PCB first. In tense installations it could bring in the ground hum or result in electrical damage of your musical equipment. What our eastern friends have done, they omitted the optocoupler and grounded the input signal. You have to do it at home, by the soldering iron.Īccording to the MIDI standard, the output (pins 4-5) should both float over the ground. Of course it was not – an 1.2$ dollar piece is too expensive in China… so they avoid putting it on the PCB. Thnx for warning, Arvydas! On my converters the optocoupler was not installed. The body was extremely easy to open – no adhesive was used nor were the two halfs melted together. if using Linux) might prefer these over tenfold more expensive models. Depending on your background and soldering skills, cheap USB-MIDI converters should be avoided at all costs or right the opposite could be true – considering the relatively low effort needed to “normalize” these gadgets, technically skilled persons (esp. Arvydas has done a great job describing what is wrong with these little Chinese converters. Like this: The connector with marking “Input” is always to be plugged into the socket marked “Output”, and vice versa.Īctually, an unimaginable quantity of these devices has been produced with certain cost related optimizations that preclude the device working in many realistic situations (with real musical devices).
Here is the correct marking of the LEDs.įor newcomers some of MIDI realities are hard to understand.
First at all, the LEDs on my model are shifted. I recently ordered some pieces of these little converters from DX.com to check the hearsays. If you don’t know what the talk is about, then the product itself looks very similar to this: The internet is saturated by discussions, whether these cheap Chinese MIDI-USB converters work or not.
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