I'm interested in winding some of my own, but before I open the books and work with the equations, I was wonding what calculators are already out there on the web.

So what are the favorites?

 

Bill:

You need to Beg, Borrow, or Steal a copy of the RCA Radiotron Designer's Handbook. (No, you can't have MINE!)

The entire Chapter 10 is on CALCULATION OF INDUCTANCE. Chapter 11 is DESIGN OF RADIO FREQUENCY TRANSFORMERS.

This is all IN ADDITION to the fundamentals of inductance in the earlier chapters.

This book is THE authority on twiddling electrons.

Eric

 

Bill:

You need to Beg, Borrow, or Steal a copy of the RCA Radiotron Designer's Handbook. (No, you can't have MINE!)

The entire Chapter 10 is on CALCULATION OF INDUCTANCE. Chapter 11 is DESIGN OF RADIO FREQUENCY TRANSFORMERS.

This is all IN ADDITION to the fundamentals of inductance in the earlier chapters.

This book is THE authority on twiddling electrons.

Eric

Looks like someone PDF'd the whole thing! Cool!


http://www.pmillett.com/tecnical_books_online.htm

 

Hello,

You are right. P Millet has scanned a lot of old (but VERY usefull) books.
The link I entered last september in the usefull websites thread.

Greetings,
Bertus

 

What values and materials were you thinking about using?

Big recommendation: Get good wire. Second: Download the PDF Files from the two big ferrite companies, one of them has a calculator application as well.

 

I often turn to Barry Hansen's calculator: http://www.coilgun.info/mark2/inductorsim.htm

 

Measuring inductor value with an Oscilloscope

Mini Ring Core Calculator Windows app, calculations, tables, and info.

 

I have several applications in mind. I can buy what I need locally, but in writing some of these articles I would like to be able to explain how to roll your own.

For example, this WIP uses a >200µH coil. I remember seeing the formula in some of my old college books, but I was wondering what else was out there.

 

Hello Bill,

A lot of information on coils can be found in the links of this page:
http://www.educypedia.be/electronics/coilsrelay.htm

One of the links is this educational one on making aircoils:
http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html

There can also the application notes from coilcraft be found:
http://www.coilcraft.com/appnotes.cfm

Greetings,
Bertus

 

Get hold of a copy of the Bernards Radio Monograph, no 160

Coil Design and Construction Manual

 

DIY cores: In distant past I used strapping steel to wind torid cores, wrapped with glass tape, might all be plastic now.

 

I thank you all for the replies. Thingmakers site is pretty close to what I was looking for.

Let's assume a total beginner, someone who is playing with circuits on a protoboard, and who may not have ready access to a lot of components. What would be the easiest core you could imagine? One thought is a #2 pencil (is graphine reactive?), or a 1/4" dowel (or a close metric equivalent), or something I haven't thought of. KISS rules apply.

I was thinking of ways to measure inductance. A transfer standard might work (using a known value and a bridge), or a simple 100Khz oscillator, variable resistor, and a DVM. Something a noob might actually have, or could cobble together cheaply. It might even be worth making an experiment out of. Again, Keep It Simple Stupid applies.

Let me know your thoughts. Thanks.