[michael1978]

hello everybody


please can somebody help me, explain me, i search on the internet how to build one , but i dont understand
how to make if transformer

i dont know nothing about transformer, i just know that they us to step up or step down voltage

i am a begginer

thnx

 

[dorke]

As a beginner you need not and should not build a transformer !
All you could ever need may be bought cheaply.
In fact professionals rarely build a transformer,they buy them as well.

 

[Minder]

Yeah, it is hardly worth winding your own I.F. txmr, you would need to know the intermediate freq for one, and type of device/stage on the in and out side.
M

 

[kellys_eye]

I think I've seen some articles on winding your own.... it's not easy but equally not impossible either. It IS, however, a lot of trouble!

Here's one from a few years ago:

http://www.rfcafe.com/references/radio-craft/if-coil-design-april-1932-radio-craft.htm

What is your specific application? It's often easier to make crystal filters of specific bandwidths than do it using transformers unless you're after some 'expensive' centre frequency (455kHz crystals are rare and expensive for example) and if it's for a receiver there are plenty of opportunities to choose your own i.f.

 

[Miguel Lopez]

As a beginner you need not and should not build a transformer !

This is a hobby, after all. So, why not?

Give a look at this page: http://m0xpd.blogspot.com/2009/12/if-transformers.html

 

[michael1978]

As a beginner you need not and should not build a transformer !
All you could ever need may be bought cheaply.
In fact professionals rarely build a transformer,they buy them as well.

maybe you are right, butttt beter to learn self to do experiments why not, thnx

 

[michael1978]

Yeah, it is hardly worth winding your own I.F. txmr, you would need to know the intermediate freq for one, and type of device/stage on the in and out side.
M

this i still dont know, i try to build one radio receiver

 

[michael1978]

I think I've seen some articles on winding your own.... it's not easy but equally not impossible either. It IS, however, a lot of trouble!

Here's one from a few years ago:

http://www.rfcafe.com/references/radio-craft/if-coil-design-april-1932-radio-craft.htm

What is your specific application? It's often easier to make crystal filters of specific bandwidths than do it using transformers unless you're after some 'expensive' centre frequency (455kHz crystals are rare and expensive for example) and if it's for a receiver there are plenty of opportunities to choose your own i.f.

i am reading the book, build you own radio transistor, is very good book to learn to build radio receiver, but i did not finish the book.....

 

[michael1978]

This is a hobby, after all. So, why not?

Give a look at this page: http://m0xpd.blogspot.com/2009/12/if-transformers.html

yeh excatly, very beatiful guide, do you know some other own like this site over if transformer, thank you

 

[michael1978]

thanks to everybody....

 

[Miguel Lopez]

yeh excatly, very beatiful guide, do you know some other own like this site over if transformer, thank you

I'm pleased to help. You can contact Harry Lythall by e-mail at http://www.sm0vpo.com/
Some time ago I downloaded an article from his blog about IF transformers which I consider very interesting. Saddly I can not find this article in the web right now.
The name of the article is:
DIY IF CANS FOR VALVES

 

[Minder]

this i still dont know, i try to build one radio receiver

Am/FM LF? MF? HF.
M.

 

[Reset]

yeh excatly, very beatiful guide, do you know some other own like this site over if transformer, thank you

This one worked for me. You can add a trimmer capacitor across it for adjustment.
http://radio.radiotrician.org/2016/04/how-to-make-if-transformer-for-that-odd.html

 

[duke37]

You will need to decide the purpose of the transformer. Is it to change the impedance or to provide a tuned circuit or both. The traditional IF transformer has an input winding and an output winding, both tuned with a capacitor and critically coupled together.

The transformers are often wave wound to reduce coil capacitance - not easy to do.
The wire may be Litz which is multiple very thin strands, all of which must be soldered.

If you want to change impedance at a high frequency, then the transformer can be wound on a ferrite toroid.

You need to specify frequency, bandwidth, power and size. If you can find one with the characteristics you want, it may be possible to copy it.

 

[kellys_eye]

This one worked for me. You can add a trimmer capacitor across it for adjustment.
http://radio.radiotrician.org/2016/04/how-to-make-if-transformer-for-that-odd.html

How does that design result in an i.f transformer? Where is the secondary?

 

[Reset]

How does that design result in an i.f transformer? Where is the secondary?

I wound a 3" coil and a 1" coil. It was used at the IF port of a Double Balanced Mixer to pick up the 1600Khz IF that feed it to an AM receiver which was tuned to 1600khz using the AM receiver as the IF for a dual conversion set.

 

[Reset]

hello everybody


please can somebody help me, explain me, i search on the internet how to build one , but i dont understand
how to make if transformer

i dont know nothing about transformer, i just know that they us to step up or step down voltage

i am a begginer

thnx

This little book says a lot about transformers.
https://ia601408.us.archive.org/6/items/CoilDesignConstructionManual/Babani-CoilDesign.pdf

 

[michael1978]

I'm pleased to help. You can contact Harry Lythall by e-mail at http://www.sm0vpo.com/
Some time ago I downloaded an article from his blog about IF transformers which I consider very interesting. Saddly I can not find this article in the web right now.
The name of the article is:
DIY IF CANS FOR VALVES

Hello i search on th internet , you mean this one
http://sm0vpo.altervista.org/blocks/if-txfmr_tube_00.htm

 

[michael1978]

Am/FM LF? MF? HF.
M.

i think FM

 

[michael1978]

This one worked for me. You can add a trimmer capacitor across it for adjustment.
http://radio.radiotrician.org/2016/04/how-to-make-if-transformer-for-that-odd.html

This site is very nice