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Registered Member #256
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Posts: 124
i was coating my sec coil and on about the 4th coat of polyurethane it got air bubbles:( will this make breakout from the secondary more likely, or will it only affect the cosmetics of the coil? i want to know if i need to make a new coil.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
teslas son wrote ...
i was coating my sec coil and on about the 4th coat of polyurethane it got air bubbles:( will this make breakout from the secondary more likely, or will it only affect the cosmetics of the coil? i want to know if i need to make a new coil.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Unless you are building a demonstration coil for a museum you shouldn't be concerned as your secondary will soon have many scars The main thing is to get the coil working, then fine tune it You MAY later rebuild it for cosmetics, but you'd be more likely to go for a new/better/bigger/smaller/different design anyway.
Registered Member #256
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ya imm makin a smaller coil and dont think this question is worth a new thread, i have a can of "plasticote" which is like a rubber coat, would this be ok to use as a sub for clear coat?
Registered Member #256
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great i will coat the coil with that then. just making a small coil, i havent seen any sparks for months and i want to so thats good, also i have a question bout my nst, i was in the process of unpotting and acidentally cut three turns on the primary, is this ok, if i need to i can rewind the primary i was thinking just remove the turns i cut out, will this make a big jump in the output voltage and possibly break down the secondary insulation?
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Depends how many turns you have to get out, to remove the three cut turns. It is better for the NSTs to be run inside the specs. -connect the secondary to the mains and measure the output voltage from the primary (the NST will work as a step down transformer). find the difference from the mains voltage value. -wind 5-10 turns on primary side. With the secondary connected to mains measure the output voltage from this new winding and calculate the number of turns/ volt. -find the number of turns needed to match the primary to the mains voltage, and wind them using wire with the same or bigger diameter. -insulate the windings.
Registered Member #256
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would it be ok to just like solder on some more wire and wind the turns again? my thinking would be that that would be ok, beacause many transformers have taps and that would essentially be a tap. also with shunts, is there a general thing that says how much more current you can get by removing a shunt?
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do i need a new coil?
