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Everything posted by DavidRaine

  1. I've worked out which are the A and B pair, but not which two wires to join to have these wired in series.. is there a simple way to work this out? If all else fails, I presume I can put a scope on both pairs and they will be out of phase with each other when they're wired series and in phase when they're wired parallel. I'd try this now but my scope has died and I've just bought another on ebay!
  2. Thanks, MP and audioguru, I appreciate your help. This forum was a good find! I've worked out which are the two windings, but not whether I'm wiring them series or parallel. I'm guessing that if I put a load on each winding and look at the phase of the voltage, I should be able to work it out...
  3. Ah, no loads, of course - that makes sense for the readings. I'm a tad wary of putting any load on until I'm sure that I have the center-tap right. I'll get a dummy load on and measure it properly... Thx
  4. Hi - forgive me if this is very basic, but I have a transformer for 240 - 240 with a center tap which I intend to use to provide two 120VAC lives, summing to 240VAC, with the center-tap providing an earth reference. Diagram attached. On running this transformer, I get some strange readings and want to check that I have a) identified the leads correctly and b) that my understanding of what it does is right. There are four leads for the secondary (two red, two black), and I assume that two of these need to be wired together to make the center-tap. Is there an easy way to identify what two wires these should be? Using a VM, I see that the two black wires have a very tiny voltage developed across them, while the reds have 240V and the paired black/reds have 120V, so presume that the blacks are the center-tap. Is this likely to be right? Now, If I've got the above right, joining the two black wires (E1 in the diagram) should effectively be at zero voltage with reference to a real ground - but I am showing circa 80V, which indicates that there is some fault. Any clues as to what I might be doing or understanding wrong here? Thanks.
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