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Old 2nd October 2006, 07:02 PM   #1
sts9fan is offline sts9fan  United States
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Default Can someone help a noob??

I really could use help wiring my ausiosector kit. the manuel is not really doing it for me after I assembled the boards. The Transformer I have has two sets of red-black for the 120 input and two sets of green-blue for the output.
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Old 5th October 2006, 01:03 AM   #2
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Is the tranny dual primary and dual secondary? Most that I've used have 3 wires on the primary side for 240 or 120v operation and 2 sets of output wires. To check if yours is a dual primary, use an ohm meter and check the resistance of the primaries first. If it's a dual primary, there will only be an electrical connection between one pair. This should be one of the black and one of the red. Then check the other pair and you should see the same result. Then check your secondaries and see which ones are paired. Finally, power one of the primaries and see which secondary corresponds with it. I usually label them. It's not that it matters much which side corresponds to which unless you're fusing each side seperately at the mains, but it's nice to know. If you do have a transformer with both dual primaries and secondaries, it's electrically the same as having 2 seperate transformers. You can run them in parallel or series to achieve the voltage you're looking for. First things first though. Get out the meter and find out what kind of animal it is.
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Old 6th October 2006, 04:55 PM   #3
AndrewT is offline AndrewT  Scotland
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and use a bulb in series with the primary to stop you blowing it up!

I use a mains bulb (various wattages from 40W to 150W) whenever I start up a new project or have carried out maintenance or modified a project, just in case I have mis-wired something.

I keep a plug top with socket outlet and bulb holder permanently wired up. It gets used regularly.

I read about it here, this is a damn good Forum.
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Old 6th October 2006, 04:59 PM   #4
sts9fan is offline sts9fan  United States
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Thanks for the help guys I am well on my way thanks to the helpful people on this board!
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Old 6th October 2006, 05:00 PM   #5
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Trafo sounds like an Antek (ebay). If so, here you go...
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File Type: gif lm3875_se_pcb.gif (49.6 KB, 280 views)
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Old 6th October 2006, 05:10 PM   #6
sts9fan is offline sts9fan  United States
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yeah thanks for that I am the one you emailed that too earlier this week.
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Old 23rd October 2006, 04:43 PM   #7
flraer is offline flraer  Sweden
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I'm sorry for stealing this thred but I just wonder if someone got a picture the the one you uploaded brian but for the LM 4780 kit instead?

It would be really nice if someone could help me.
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Old 24th October 2006, 01:09 AM   #8
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I'll try to do it tonight...
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Old 24th October 2006, 08:17 PM   #9
flraer is offline flraer  Sweden
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Thank you Brian


This is a very good forum with very helpful users!
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