So you would have a RBUS to USB solution for about $175 - and as I said, possibility for other RBUS interfaces later if there was interest. I would guess about $40 or $50.Īnd none of this would be in a case - you would have to figure that out on your own. I am not going to order these USB boards for anyone because first, it would tie up a bunch of money at $125 each (which is what it finally cost with shipping), and second,I would run into all kinds of issues with customs and import duty owedĭon't know what the little interface boards would cost until I have them totally working. Sell these to whoever wants one - these people would have to order their own USB interface board from the HongKong company to use with it. Layout and fab a small PC board that plugs into the RBUS port and provides the interface circuitry needed - get about 25 or so built Then - IF I SEE ENOUGH interest at the price point - (I would need to feel pretty confidant at least 25 or so people would buy one.) Get a functional breadboard working - more for my own amusement and prove I can do it than anything. but will post another update as I get a prototype working. I am a bit busy right now with real work. Or another board that has analog AD and DA so it emulates a ADA7000 Or another board that has an ADAT port so the whole thing emulates a DIFAT24. There will be a small dongle board that plugs into the db25 connector of the RBUS - the interface circuit will be built into an Altera CPLD on this board, and then there will be a ribbon connector to interface to the I2S bus on the USB interface.īy using a CPLD, it gives me lot's of flexibility, first to tweak this design, but further to connect this RBUS interface to other things in the future also.įor instance - maybe have a second board that taps into the RBUS midi port I ordered some parts and just got them in to breadboard up a prototype. it totally (on paper) looks like it is going to work fine. I spent the weekend doing some design on an interface circuit to make the RBUS interface properly with the I2S bus. The I2S bus is connected through a 2mm 7x2 ribbon cable connector in between the TOSLINK jacks. USB port on one end and the TOSLINK SPDIF connectors on the other. I poked around on the I2S bus connector with my oscilloscope and it all looks just like it should. Reaper sees all the outs and ins (8x8 on the I2S bus and 2x2 SPDIF) with it's ASIO driver and it all seems pretty solid so far. Reaper is able to control it just fine as far as setting sample rates and buffer sizes etc. I have plugged it in and loaded the drivers and it all looks pretty good so far. Update - the board got here from HongKong in today's mail.
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