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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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15th Jan 2009, 7:05 pm | #1 |
Retired Dormant Member
Join Date: Jan 2009
Location: Margate
Posts: 19
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Homebrew IF Transformer formers
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15th Jan 2009, 9:12 pm | #2 |
Octode
Join Date: Aug 2006
Location: Willington, County Durham, UK.
Posts: 1,498
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Re: Homebrew IF Transformer formers
Wow, what a grand job!! I would not be suprised if you started getting orders for them. Cheers, Malc.
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Malc Scott |
15th Jan 2009, 11:43 pm | #3 |
Octode
Join Date: Aug 2006
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 1,082
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Re: Homebrew IF Transformer formers
Wonderfull ! I wish I had a lathe a little imagination and some skill the possibilities are endless !
regards Trevor |
16th Jan 2009, 12:35 am | #4 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,571
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Re: Homebrew IF Transformer formers
This just goes to show what can be achieved with a little lateral thinking and the high skill levels to be found on this forum.
Keep up the good work. Keith |
16th Jan 2009, 1:40 pm | #5 |
Heptode
Join Date: Nov 2004
Location: Ripon, N.Yorkshire, UK.
Posts: 782
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Re: Homebrew IF Transformer formers
Great stuff! Where do you get your 6mm ferrite cores?
Jim |
17th Jan 2009, 10:51 am | #6 |
Retired Dormant Member
Join Date: Jan 2009
Location: Margate
Posts: 19
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Re: Homebrew IF Transformer formers
Well I got some from Ebay, just had a look and they are still there but price has gone up a bit, a search on Ferrite cores will find them, but you can get any standard size cores from http://www.surplussales.com/index.html
this is a great firm with lots of hard to find items like airspaced coil stock etc the cores are where the coil formers are, the site is well worth a browse |
17th Jan 2009, 12:31 pm | #7 |
Heptode
Join Date: Nov 2004
Location: Ripon, N.Yorkshire, UK.
Posts: 782
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Re: Homebrew IF Transformer formers
Cheers,I'll try them,
Jim |
17th Jan 2009, 12:53 pm | #8 |
Heptode
Join Date: Nov 2004
Location: Ripon, N.Yorkshire, UK.
Posts: 782
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Re: Homebrew IF Transformer formers
Just found some at £6 per hundred so I've ordered 100!
Many thanks, Jim |
20th Jan 2009, 1:38 pm | #9 |
Retired Dormant Member
Join Date: Jan 2009
Location: Margate
Posts: 19
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Re: Homebrew IF Transformer formers
Jim, if they are the same cores as the ones I got then you will find they are slightly oversize, the ad says 6mm but mine were 6.13mm this makes them a very tight fit into an M6 thread, so I drilled out to 6mm and then put an M7 thread in, this makes a really nice fit, also they are hollow so not a lot of meat there, I found if I needed a bit more core its easy to cement a smaller core inside or extend it with a bit of thin ferrite rod, from Ron...
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21st Jan 2009, 11:59 pm | #10 |
Heptode
Join Date: Nov 2004
Location: Ripon, N.Yorkshire, UK.
Posts: 782
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Re: Homebrew IF Transformer formers
Thanks for that Ron!
Jim |
24th Jan 2009, 3:17 pm | #11 |
Tetrode
Join Date: Jan 2007
Location: Lincoln, Lincs. UK.
Posts: 94
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Re: Homebrew IF Transformer formers
I just found this site for people like me who neither have the superb skill that Ron possesses (not to mention patience I imagine). http://www.angelfire.com/electronic/.../IF_Can-1.html.
Fantastic job Ron. Charlie |
24th Jan 2009, 4:17 pm | #12 |
Retired Dormant Member
Join Date: Jan 2009
Location: Margate
Posts: 19
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Re: Homebrew IF Transformer formers
Excellent idea!! I wonder if it would work at say 1.6mhz with something like a 100uh choke and 100pf trimmer
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24th Jan 2009, 7:34 pm | #13 |
Tetrode
Join Date: Jan 2007
Location: Lincoln, Lincs. UK.
Posts: 94
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Re: Homebrew IF Transformer formers
I guess the beauty of this idea is that you can effectively choose your own IF frequency with the chokes that are available. I read somewhere (I think it was possibly PW) that you can homebrew chokes by winding loads of turns onto say a 2M ohm 1 watt resistor. I guess a larger, say 2 or 3 watt if you need more room for turns. Just need to find a source of reasonably priced non-inductive high value high wattage resistors!
Charlie |