|
Websites Found an interesting website? Post the details here and share it with the rest of us. Please stick to websites that are in some way related to our hobby/interest. |
|
Thread Tools |
12th Dec 2017, 2:46 pm | #1 |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,763
|
Handy homebrew coil calculator
I don't get the impression that many on the forum are into winding coils for simple homebrew radios, (crystal sets, simple TRF valve sets etc), but nevertheless, for those that are so minded, there's a neat little calculator which enables to you input the tuning capacitor value, the desired frequency coverage coil diameter and so on, and if will tell you the inductance needed, and the number of turns on the coil.
If you happen to have a coil to hand, know what its inductance is, and want it to resonate at a particular frequency, it will tell you what value of capacitor you will need. Not meant for anything too complex, but a neat little tool for use as appropriate. It was created by an American radio amateur, Dan Perersen, W7OIL, and the calculator is aptly named 'Professor Coyle'! http://www.crystalradio.net/professo...coylecyl.shtml Hope that might be of use to someone, or at least worth bookmarking.
__________________
David. BVWS Member. G-QRP Club member 1339. |
12th Dec 2017, 3:20 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,554
|
Re: Handy homebrew coil calculator
That looks useful.
|
12th Dec 2017, 8:06 pm | #3 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,579
|
Re: Handy homebrew coil calculator
That's a useful calculator. It even gives you the length of the wire required to wind a coil, quite a handy feature.
Symon. |
12th Dec 2017, 8:25 pm | #4 |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,763
|
Re: Handy homebrew coil calculator
Yes - nicely presented too.
Maybe I'll wind a test coil and see how close the actual inductance turns out to be as compared to the calculation (or not)!
__________________
David. BVWS Member. G-QRP Club member 1339. |
13th Dec 2017, 8:00 am | #5 |
Heptode
Join Date: Feb 2009
Location: Rotherham, South Yorkshire, UK.
Posts: 559
|
Re: Handy homebrew coil calculator
Morning David.
It looks to be a useful site and I enjoyed looking at the main web page with the lady on the work-bench. Regards Kevin. |
13th Dec 2017, 9:09 am | #6 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
|
Re: Handy homebrew coil calculator
Very useful tool and site. I've been making inductors like that for a while because it's cheaper, more convenient and they are more stable than ferrites and they don't shatter when you drop them. PVC water pipes from Wickes make nice coil formers. Interestingly, nice and high Q as well, not that I can measure it very well with my cruddy equipment.
The workbench pictures are indeed appreciated, only because they act as a reference to SWMBO that my corner perhaps is not as messy as it could be |
13th Dec 2017, 11:28 am | #7 | |
Dekatron
Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
Posts: 5,763
|
Re: Handy homebrew coil calculator
Quote:
Yes, quite apart from the Coil Calculator, the main website is a mine of information, all nicely presented.
__________________
David. BVWS Member. G-QRP Club member 1339. |
|
13th Dec 2017, 7:17 pm | #8 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,579
|
Re: Handy homebrew coil calculator
Hi.
I read somewhere, quite probably on this forum, that glass makes an excellent former for coils and high Q is normally achievable. Regards Symon |