It seems not to have been mentioned so the techie bits.
It's the current through the windings that affects the saturation of the core. The flux density increases with current and eventually the ferrite core saturates.
Some ferrite is specified for audio use, however you'll need to check whether or not it's suitable for the current that you'll be putting through the windings. What you're looking for are ferrites that have high values for H and B in the specifications. I can't tell you what values would be regarded as "high", perhaps someone else can.
regards, Keith
It's the current through the windings that affects the saturation of the core. The flux density increases with current and eventually the ferrite core saturates.
Some ferrite is specified for audio use, however you'll need to check whether or not it's suitable for the current that you'll be putting through the windings. What you're looking for are ferrites that have high values for H and B in the specifications. I can't tell you what values would be regarded as "high", perhaps someone else can.
regards, Keith
Any option in the quality of the wire?
If I were to settle down to winding air core coils, would the quality of the wire used make any difference? Specifically, can I use the enamelled wire generally used in winding transformers? Dont tell me that there are gold or silver plated ones!! I have used these transformer enamelled wires and have settled down to like the audio quality -- how could I be dissatisfied in the absence of any comparison?
please advise.
If I were to settle down to winding air core coils, would the quality of the wire used make any difference? Specifically, can I use the enamelled wire generally used in winding transformers? Dont tell me that there are gold or silver plated ones!! I have used these transformer enamelled wires and have settled down to like the audio quality -- how could I be dissatisfied in the absence of any comparison?
please advise.
Just thought that I would throw in that they sell enamelled wire specifically for winding transformers and inductors. In Designing, Building and Testing Loudspeakers, author David Weems recommends old transformers as a source of wire. It is not some sort of thing you are "getting away with"-that is what the wire is for.
Remember, the thinner the wire, the cheaper, but also the greater DC resistance. Try to keep the DC resistance under 1 ohm, if possible.
Otherwise, enjoy "rolling your own"!
Remember, the thinner the wire, the cheaper, but also the greater DC resistance. Try to keep the DC resistance under 1 ohm, if possible.
Otherwise, enjoy "rolling your own"!
Last post on this thread was 15 years ago, so well and truly dead. The easiest way to determine suitability is to wind a few test coils. A little clever work with a soundcard audio test setup and you can figure out all you need without equations that have unknowns you don't know and can't plug in.
Reusing a flyback core for an high value audio power inductor requires a really big gap unless you are dealing with very low power. You'd need to leave the core in half and just wind over one round leg, or turn them out and make an "S" hook out of it... Basically approximating a solenoid. Trying to calculate the result with salvaged material is likely to leave you in the dark. Bonus: L meters that actually work can be had cheap these days.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.