Inductor's Bobbin Design

I think that means there isn't a bobbin, or at least no bobbin flange to hold the wire in place. Instead it's layer-by-layer interleave wound and holds itself in place, perhaps with the help of lacquer.

Or, you could ask this fellow, "TRANSFORMER REWINDING SERVICE - Rewinding facility available for audio, power and other "difficult" transformers where replacements are not available. Specialising in "cheekless bobbin" layer-interleaved rewinding. Contact Brian at Computer Technical Engineering on 041 365-3935" BTW, that's in Port Elizabeth, South Africa. :>)

It is a bobbin with only a central core. Some form of cheeks were there during the winding, but they get removed, and the final coil is made self supporting. The lack of cheeks give a slight increase in winding area, but it is not an easy process to do, and modern strong plastics have made it less useful.

Hello Winfield,

Our dogs would probably call that a "bone with chewed off ends".

Cheeks and inductors. That must have been coming from some bureaucrat.

Regards, Joerg

Thanks. It's really helpful. Have a nice day!!