Hi all,
I have a transformer taken from an aiwa P80 defunct amp. Secondary voltages are 60VCT and I think a 12V or so. The problem is that I have 4 primary wires. Black, Yellow, Orange and White. The amp had voltage selector for 110V 220V and 240V. I need the 240V setting. I tried once and blew the power board circuit breaker. Hmm, I need help please. Only thing I can think of is to put say 9 volts on the secondaries and measure the primaries but, is there another (safer) way to do this.
Terry
I have a transformer taken from an aiwa P80 defunct amp. Secondary voltages are 60VCT and I think a 12V or so. The problem is that I have 4 primary wires. Black, Yellow, Orange and White. The amp had voltage selector for 110V 220V and 240V. I need the 240V setting. I tried once and blew the power board circuit breaker. Hmm, I need help please. Only thing I can think of is to put say 9 volts on the secondaries and measure the primaries but, is there another (safer) way to do this.
Terry
No, the wire gauge wouldn't affect the voltage.
If you have a choice of 4 voltages, and only 4 taps on the transformer, I would expect one 0-240V winding with 2 taps, one at 110V and the other at 220V.
If you blew the fuse, you either wired the secondary to the mains, or the 220-240 section to the mains. Which means you had 240 * (240 / 60) volts or 240 * ( 60 / 20 ) - i.e. you exposed yourself to 960 Volts or 720 Volts.
Either way, you could have killed yourself.
edit: corrected an error in the math.
If you have a choice of 4 voltages, and only 4 taps on the transformer, I would expect one 0-240V winding with 2 taps, one at 110V and the other at 220V.
If you blew the fuse, you either wired the secondary to the mains, or the 220-240 section to the mains. Which means you had 240 * (240 / 60) volts or 240 * ( 60 / 20 ) - i.e. you exposed yourself to 960 Volts or 720 Volts.
Either way, you could have killed yourself.
edit: corrected an error in the math.
Thanks for the reply.
I know which ones are the secondaries. They are terminated with plugs.
What I think I did was to connect the primaries wrong. I have since measured the resistance and I think sorted out which wire is which, well I am assuming that the two wrires with the most resistance should be at each end of the primary.
I also know that the wire size has no effect on the voltage, but does the primary side effect the current draw.
PS. The power board I use has a good circuit breaker etc.
Terry
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