Inductors made for crossover in an amp?

hacknet · 12th September 2004, 12:43 PM

sorry for asking an elementary question but i kinda can`t find the answers.

Can inductors made for speaker crossovers be used for and amp`s powersupply?

i`m lookin at the ferrite core inductors on sale in madisound. at 19awg, how much current can i pass through it before it saturates?

Thank You!

SY · 12th September 2004, 01:07 PM

Many amps but low inductance.

hacknet · 12th September 2004, 02:40 PM

take for instance the 14.5H 19awg one going for ~$6.

is it any use in an amp ? i`m hopping to use in an KT88 SE monoblocks drawing 100ma Iq. i`m thinking of dumping 2 in series to get 30H which might be sufficient.

is it okaY?

jlsem · 12th September 2004, 03:25 PM

Quote:

take for instance the 14.5H 19awg one going for ~$6.

Those are actually 14.5 millihenrys - only really good for intended application. There are no cheap power inductors out there except military surplus. Try Surplus Sales of Nebraska.

John

hacknet · 12th September 2004, 05:26 PM

oh dang... read da units wrongly...

thanks anyway!

316a · 13th September 2004, 08:42 AM

Quote:

Originally posted by hacknet
sorry for asking an elementary question but i kinda can`t find the answers.

Can inductors made for speaker crossovers be used for and amp`s powersupply?

i`m lookin at the ferrite core inductors on sale in madisound. at 19awg, how much current can i pass through it before it saturates?

Thank You!

Hello ,
No good , I'm afraid ! Too low in value and only rated for AC . I suppose you could always use cheap surplus SE output transformers and leave the secondary flapping . May also make so-so plate chokes

cheers

316a

Sch3mat1c · 13th September 2004, 08:52 AM

Well, you could use them with say 20mF (= 20,000uF), but that's only useful for a good number of amperes, at low voltage (read: SS).

However, they also represent greater loss due to having no core, or at least a ferrite one. A good power choke would use a laminated iron core, allowing more filtering for less size and loss. Though any inductance is better than the rampant CRC filters I saw on last look through the SS forum...

Tim

hacknet · 13th September 2004, 11:03 AM

haha... i`m planning 30uf->30H->40uf of MKP caps for my powersupply....

JojoD818 · 15th September 2004, 09:49 AM

Just curious, why can't I find any details on winding a diy choke? I mean, we have the magnet wires, the E-I cores, covers and legs, the only thing missing is the number of turns and what size to use.

And I also have a manual rewinding machine.

Just a thought.

JojoD818 · 15th September 2004, 03:30 PM

Anyone?

12th September 2004, 12:43 PM	#1
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	Inductors made for crossover in an amp? sorry for asking an elementary question but i kinda can`t find the answers. Can inductors made for speaker crossovers be used for and amp`s powersupply? i`m lookin at the ferrite core inductors on sale in madisound. at 19awg, how much current can i pass through it before it saturates? Thank You!

12th September 2004, 01:07 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Many amps but low inductance. __________________ If there's a sucker born every minute, where do the rest of them come from?

13th September 2004, 08:52 AM	#7
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Well, you could use them with say 20mF (= 20,000uF), but that's only useful for a good number of amperes, at low voltage (read: SS). However, they also represent greater loss due to having no core, or at least a ferrite one. A good power choke would use a laminated iron core, allowing more filtering for less size and loss. Though any inductance is better than the rampant CRC filters I saw on last look through the SS forum... Tim __________________ Seven Transistor Labs Projects and Resources

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12th September 2004, 02:40 PM	#3
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	take for instance the 14.5H 19awg one going for ~$6. is it any use in an amp ? i`m hopping to use in an KT88 SE monoblocks drawing 100ma Iq. i`m thinking of dumping 2 in series to get 30H which might be sufficient. is it okaY?

12th September 2004, 05:26 PM	#5
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	oh dang... read da units wrongly... thanks anyway!

13th September 2004, 11:03 AM	#8
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	haha... i`m planning 30uf->30H->40uf of MKP caps for my powersupply....

15th September 2004, 09:49 AM	#9
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	Just curious, why can't I find any details on winding a diy choke? I mean, we have the magnet wires, the E-I cores, covers and legs, the only thing missing is the number of turns and what size to use. And I also have a manual rewinding machine. Just a thought.

15th September 2004, 03:30 PM	#10
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	Anyone?

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