davelectronic
- Dec 13, 2010
- 1,087
- Joined
- Dec 13, 2010
- Messages
- 1,087
Hi you all.
I was looking for some advice, finally got round to removing the secondary high voltage winding of the MOT Ive claimed from our old microwave.
What i was hopping to find some idea as to wire diameter verses current, maths is not my strong point, so all i can find here in the retail sector is 14 SWG approximately 12 AWG the diameter is a little over 2 mm, i opted not to grind apart the ( EI ) on the transformer, the cut was made both sides, then put an 6,8,10 mm drill bit through the old secondary winding, and knocked out the shunts.
My question was does any one have an idea of the current peak if i use 2mm enameled copper wire if wound to approximately 12 volts AC, then allowed for rectification and capacitance, about 16.90 volts unregulated DC.
Thats if i can with some extra help fight winding the wire as the new low voltage secondary, tough as its going to be, i was kind of thinking of a more supple high temperature other coated copper wire, but i think all the cables i can find wont cope with the heat.
So was looking for varnish suitable for coating windings, really as insurance in case i need to use a soft mallet for uniform encouragement of the new windings.
In summary can anyone advice me on the current, and possible source of a suitable high temp varnish, i should have measured the primary resistance, but i did apply power for 30 seconds with a meter in series, no secondary winding so no load, current was about 3 amps.
Any help appreciated.
Dave.
PS, if i could find a thicker enameled copper wire i doubt me or extra help from a friend could manipulate it and so wind it. So i cant go beyond 2mm, or 14 SWG. Only if i can find a high temp coated multi strand.
I was looking for some advice, finally got round to removing the secondary high voltage winding of the MOT Ive claimed from our old microwave.
What i was hopping to find some idea as to wire diameter verses current, maths is not my strong point, so all i can find here in the retail sector is 14 SWG approximately 12 AWG the diameter is a little over 2 mm, i opted not to grind apart the ( EI ) on the transformer, the cut was made both sides, then put an 6,8,10 mm drill bit through the old secondary winding, and knocked out the shunts.
My question was does any one have an idea of the current peak if i use 2mm enameled copper wire if wound to approximately 12 volts AC, then allowed for rectification and capacitance, about 16.90 volts unregulated DC.
Thats if i can with some extra help fight winding the wire as the new low voltage secondary, tough as its going to be, i was kind of thinking of a more supple high temperature other coated copper wire, but i think all the cables i can find wont cope with the heat.
So was looking for varnish suitable for coating windings, really as insurance in case i need to use a soft mallet for uniform encouragement of the new windings.
In summary can anyone advice me on the current, and possible source of a suitable high temp varnish, i should have measured the primary resistance, but i did apply power for 30 seconds with a meter in series, no secondary winding so no load, current was about 3 amps.
Any help appreciated.
Dave.
PS, if i could find a thicker enameled copper wire i doubt me or extra help from a friend could manipulate it and so wind it. So i cant go beyond 2mm, or 14 SWG. Only if i can find a high temp coated multi strand.