Inductors

tumler · 16th August 2006, 01:56 AM

Hey,

I'm about to start building my first amplifier but I have been caught on what the inductor(choke) is?

I'm building the Jaycar Studio Series 350 amp and need a 6.8uH inductance.

Would somebody be able to give me a link or tell me how to make one.

And the only inductor / choke I can find in Jaycar with 6.8uH is a RF choke, I'm sure this won't work but could somebody please tell me the difference between a choke and inductor.

Thanks alot

Leolabs · 16th August 2006, 02:04 AM

Try to search on Wikipedia.

rpapps · 16th August 2006, 02:26 AM

Hi Tumler
The instructions for making it are in the Silicon Chip article, February 2004, page 23.
If you can't get hold of it, it's 23.5 turns of 1mm enamelled copper wire wound on a 13mm inside diameter plastic bobbin.
Wrap in insulating tape to hold winding in place.

Incidentally, depending on where you got the circuit from, there may be an error. Check the 470uF cap on the -70 rail adjacent to F2. The original schematic has this reversed and could be an explosion risk.

You should also check the notes & errata here:
http://www.siliconchip.com.au/cms/A_104440/article.html

Cheers
Rob

tumler · 16th August 2006, 06:21 AM

Thanks alot Rob
more than enough information to get me started

rpapps · 16th August 2006, 06:31 AM

Hi
You're welcome.
If you can't easily get the 13 mm bobbin, 1/2 inch or 12 mm dowel rod would probably be fine. Just make it 24 turns.
Cheers
Rob

16th August 2006, 01:56 AM	#1
tumler diyAudio Member Join Date: Aug 2006	Inductors Hey, I'm about to start building my first amplifier but I have been caught on what the inductor(choke) is? I'm building the Jaycar Studio Series 350 amp and need a 6.8uH inductance. Would somebody be able to give me a link or tell me how to make one. And the only inductor / choke I can find in Jaycar with 6.8uH is a RF choke, I'm sure this won't work but could somebody please tell me the difference between a choke and inductor. Thanks alot

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16th August 2006, 02:04 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Try to search on Wikipedia.

16th August 2006, 02:26 AM	#3
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Hi Tumler The instructions for making it are in the Silicon Chip article, February 2004, page 23. If you can't get hold of it, it's 23.5 turns of 1mm enamelled copper wire wound on a 13mm inside diameter plastic bobbin. Wrap in insulating tape to hold winding in place. Incidentally, depending on where you got the circuit from, there may be an error. Check the 470uF cap on the -70 rail adjacent to F2. The original schematic has this reversed and could be an explosion risk. You should also check the notes & errata here: http://www.siliconchip.com.au/cms/A_104440/article.html Cheers Rob

16th August 2006, 06:21 AM	#4
tumler diyAudio Member Join Date: Aug 2006	Thanks alot Rob more than enough information to get me started

16th August 2006, 06:31 AM	#5
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Hi You're welcome. If you can't easily get the 13 mm bobbin, 1/2 inch or 12 mm dowel rod would probably be fine. Just make it 24 turns. Cheers Rob

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