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Diabolical Artificer · 14th Jan 2021, 9:11 am

With homemade cardboard bobbins the problem is they fall apart if you try and wind too tight I've found, you have to be very careful. I tried using copper clad board soldered making sure to cut a gap but then faced the problem of SC windings that went through holes in the board. But for that varnished copper clad board makes very strong bobbins and is easy to solder,you just have to remember to insert a gap so it isn't a shorted turn.

Bobbins available here - https://www.ebay.co.uk/itm/Bobbins-E...QAAOSwC6dZqxIQ & here - https://www.ebay.co.uk/itm/BOBBIN-CO...QAAOSwTe5fPpKH

Andy.

14th Jan 2021, 9:11 am	#19
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,667	Re: Home made transformer With homemade cardboard bobbins the problem is they fall apart if you try and wind too tight I've found, you have to be very careful. I tried using copper clad board soldered making sure to cut a gap but then faced the problem of SC windings that went through holes in the board. But for that varnished copper clad board makes very strong bobbins and is easy to solder,you just have to remember to insert a gap so it isn't a shorted turn. Bobbins available here - https://www.ebay.co.uk/itm/Bobbins-E...QAAOSwC6dZqxIQ & here - https://www.ebay.co.uk/itm/BOBBIN-CO...QAAOSwTe5fPpKH Andy. __________________ Curiosity hasn't killed this cat...so far.