I have an analog synthesizer that is set up for european voltage. The Transformer inside can be altered so that it can accept US voltage and Hertz. On this transformer there are four wires to which the line load will enter and the other side has a plug to where the voltage should be around +15v, -15v, and ground.
I experimented slightly with the transformer to see what measurements I could with a small power supply. I measured across the +/- 15v/ground side aith a meter while applying voltage to the different wires on the other side. The colors of those wires are Black, Brown, Orange, and Yellow (in that order). The original wiing was sending the hot to orange and the nuetral to black. This was supposed to be set up for either 220v or 240v at 50Hz.
Now while using a small load I tested different combinations of wires and found that the fuse blew when I connected the load to the orange and yellow wires. I figure this to be the hot for the 50hz load and the 60Hz load respectively. Therefore, I am left with the Brown and Black wires for the nuetral line.
Since the Orange was the hot for the 50Hz, I should presume that the Yellow would be the hot for the 60Hz hot, correct? It just seems to make the most sense by the action of the fuse to me.
Now if this is true, I found that with a 110v line load with hot to yellow and white/nuetral to the brown I got a reading of 17.2v and 10.37v when I applied the white to the black transformer wire. Would it be safe to assume that the correct wiring for an American line load would be the hot to yellow and the nuetral to brown at 17v? I know it is only a couple of volts over, but I want to be as sure as I can before making the wiring permanent and reconnection the power supply to the Korg synth.
I appreciate any and all help!
J
I experimented slightly with the transformer to see what measurements I could with a small power supply. I measured across the +/- 15v/ground side aith a meter while applying voltage to the different wires on the other side. The colors of those wires are Black, Brown, Orange, and Yellow (in that order). The original wiing was sending the hot to orange and the nuetral to black. This was supposed to be set up for either 220v or 240v at 50Hz.
Now while using a small load I tested different combinations of wires and found that the fuse blew when I connected the load to the orange and yellow wires. I figure this to be the hot for the 50hz load and the 60Hz load respectively. Therefore, I am left with the Brown and Black wires for the nuetral line.
Since the Orange was the hot for the 50Hz, I should presume that the Yellow would be the hot for the 60Hz hot, correct? It just seems to make the most sense by the action of the fuse to me.
Now if this is true, I found that with a 110v line load with hot to yellow and white/nuetral to the brown I got a reading of 17.2v and 10.37v when I applied the white to the black transformer wire. Would it be safe to assume that the correct wiring for an American line load would be the hot to yellow and the nuetral to brown at 17v? I know it is only a couple of volts over, but I want to be as sure as I can before making the wiring permanent and reconnection the power supply to the Korg synth.
I appreciate any and all help!
J