I am posting this here since i rather frequently gets emailed about how i did the conversion.
There are basically two things you need to do.
1. reconnect the transformer so it converts 230v to whatever it should be.
Underneath the dac there is a huge sticker, a black solid one with some text. Tear it of and you will discover a rectanguler hole with a black plastic box, Pull it out and you see several legs on it, think it was 14 pins. What this box is doing is only almost nothing besides having conections between some pins. Use a voltage meter and measure the what pins that are connected. This decides how the transformator is wired on the primary side. The tranformator have several windings on the primary side and for the american marked, two windings are connected in paralell. The task is to find out how to serilize the windings.
2. There is a frequency detector inside the unit. It measures the frequency of the input current, this measurement is done on the secondary windings of the transformator. Ie. after the transformator and before the dc conversion. You should see a connection on the circuit board going directly from the transformator to a chip, i think it was diode in serial with this - probably to protect it from spikes. I think the chip was a z80 cpu, however I might be wrong. I made a tiny circuit board from a veroboard and soldered a ATtiny microcontroller on it, the controller was calibrated and programmed to give a 60 Hz frequency out. I soldered out the diode i mentioned and connected the controller directly to the chip.
Its been a while i converted the one I had this i am unable to give more precise instructions. If you are skilled in electronics, you will figure this out easely. To the others, dont try - you risk ruining your dac.
There are basically two things you need to do.
1. reconnect the transformer so it converts 230v to whatever it should be.
Underneath the dac there is a huge sticker, a black solid one with some text. Tear it of and you will discover a rectanguler hole with a black plastic box, Pull it out and you see several legs on it, think it was 14 pins. What this box is doing is only almost nothing besides having conections between some pins. Use a voltage meter and measure the what pins that are connected. This decides how the transformator is wired on the primary side. The tranformator have several windings on the primary side and for the american marked, two windings are connected in paralell. The task is to find out how to serilize the windings.
2. There is a frequency detector inside the unit. It measures the frequency of the input current, this measurement is done on the secondary windings of the transformator. Ie. after the transformator and before the dc conversion. You should see a connection on the circuit board going directly from the transformator to a chip, i think it was diode in serial with this - probably to protect it from spikes. I think the chip was a z80 cpu, however I might be wrong. I made a tiny circuit board from a veroboard and soldered a ATtiny microcontroller on it, the controller was calibrated and programmed to give a 60 Hz frequency out. I soldered out the diode i mentioned and connected the controller directly to the chip.
Its been a while i converted the one I had this i am unable to give more precise instructions. If you are skilled in electronics, you will figure this out easely. To the others, dont try - you risk ruining your dac.