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Electronics => Projects, Designs, and Technical Stuff => Topic started by: lordvader88 on April 27, 2018, 05:55:35 am

Title: What kind of insulation for winding your own transformers/coupled inductors
Post by: lordvader88 on April 27, 2018, 05:55:35 am
I have to rewind a transformer, for a vacuum tube oscilloscope. From 120V upto about 550Vrms. Whats some recommended tape or plastic/etc that will last and not melt in a big old hot transformer. They used paper or a cloth type thing, glued up. I can still remember the burnt smell taking it apart, yuk.

I'll have to get all the proper rated magnet wire too, another day tho.

Also for fun I want to try making some small HV SMPS trans/CI. Just power off 12Vdc 1A. How safe is standard PVC tape and ordinary office paper for little low energy flybacks like for a Jaccob's Ladder you see on ebay
Title: Re: What kind of insulation for winding your own transformers/coupled inductors
Post by: Rerouter on April 27, 2018, 08:44:33 am
I would say something like kapton tape.
Title: Re: What kind of insulation for winding your own transformers/coupled inductors
Post by: CJay on April 27, 2018, 09:24:43 am
I wouldn';t use PVC tape, it'll 'probably' be ok for a while but it's not good with heat.

I'd use a high temperature tape, Kapton or similar as Rerouter says, there are also 'proper' transformer tapes as well as fibreglass tapes.

I wouldn't want anything that could absorb moisture in a high voltage transformer but office paper might be fine if soaked in 'dope' or lacquer to seal it
Title: Re: What kind of insulation for winding your own transformers/coupled inductors
Post by: Neilm on April 27, 2018, 09:43:12 am
Quote from: CJay on April 27, 2018, 09:24:43 am

I wouldn't want anything that could absorb moisture in a high voltage transformer but office paper might be fine if soaked in 'dope' or lacquer to seal it
Old transformer with paper  in would have the paper soaked, then when wound would be placed into a vacuum chamber and impregnated under vacuum. I wouldn't try to replicate that for fun. Stick with the kapton tape
Title: Re: What kind of insulation for winding your own transformers/coupled inductors
Post by: lordvader88 on April 27, 2018, 01:18:15 pm
Ok thanks, kapton tape, they use around heater elements too right ?