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The right kind of inductor!
The right kind of inductor!
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Old 14th April 2018, 06:09 PM   #11
sippy is offline sippy  United Kingdom
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UK prices:
193T - 34
193V - 71
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Old 14th April 2018, 06:52 PM   #12
Soundhappy is offline Soundhappy  France
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France Mouser prices are :
193T cost 37.95 € ~ 46.82 US$
193T Hammond Manufacturing | Mouser France
193V cost 79.29 € ~ 97.82 US$
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I build Big 20 watts MoFo and imo cost & Diy project ratio is excellent.
Very affordable if compare with more fancy amplifiers.
WAF can be good as well. Kind regards
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Old 15th April 2018, 12:14 AM   #13
oon_the_kid is offline oon_the_kid  Malaysia
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The reason I am asking this topic is, the inductor I used as an example is only USD $4.

So it makes me wonder if other inductors can be used. After all Mouser stocks 20,000 inductors.

I have used a smaller inductor for making a tweeter amp. 15mH by bourns.

Another question that puzzles me is, we know the inductor typically has to be between 50-100 mH. But if a smaller one is used, which would degrade, the gain bandwidth or the power bandwidth or just an increase in distortion?

Oon
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Old 15th April 2018, 12:37 AM   #14
6L6 is online now 6L6  United States
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The right kind of inductor!
For the application you are asking about the inductor needs to;

1) have some reasonable inductance for the job, say 25-50mH

2) be able to withstand the DC current that the circuit requires. If it's too small it will saturate and lose most of it's inductance

The DC aspect is what will make it physically large and therefore expensive.

Last edited by 6L6; 15th April 2018 at 12:40 AM.
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Old 15th April 2018, 01:41 AM   #15
oon_the_kid is offline oon_the_kid  Malaysia
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I used this once on an amp. I worked quite well.

1140-153K-RC J.W. Miller | Mouser Singapore

I didn't measure freq response etc. So I suspect it doesn't go all the way to 20Hz. I was only hoping for a hundred hertz. And the power was much lower.

Looking at the data, one thing that indicated that it was suitable was it listed Isat which is twice of that of I rms.

I think this one is also suitable.

C-56U Triad Magnetics | Mouser Singapore

From what I gathered so far, this seems to be what would make it suitable.

Air core. PE has aircore inductor up to 16mH.

DC choke.

Any other ideas?

Oon
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Old 15th April 2018, 05:37 AM   #16
oon_the_kid is offline oon_the_kid  Malaysia
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I had some thoughts. What if I used an AC choke. But kept the current low, say half of the max current. That would ensure the core does not saturate.

Say for example, we use a inductor designed for 4A, if we use about 2A DC.

Oon
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Old 15th April 2018, 02:22 PM   #17
Michael Rothacher is offline Michael Rothacher  United States
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The right kind of inductor!
The C-56U borders on adequate, especially if you don't need the bandwidth.
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Old 15th April 2018, 04:00 PM   #18
oon_the_kid is offline oon_the_kid  Malaysia
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Quote:
Originally Posted by Michael Rothacher View Post
The C-56U borders on adequate, especially if you don't need the bandwidth.
Hey Michael,

I think you might one of those most experienced in this field. Is it the frequency response bandwidth or the power bandwidth is affected if the inductor is too small?

I am going to give this one a try..

PA4415NL Pulse Electronics | Mouser Singapore

The DC current I am going to use 1-2A is much lower than the peak currentof 5A. Will see it works out..

Oon
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Old 15th April 2018, 05:30 PM   #19
Zen Mod is online now Zen Mod  Serbia
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The right kind of inductor!
that's AC inductor

you'll have bloody nuttin' in speakers
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Old 15th April 2018, 05:41 PM   #20
6L6 is online now 6L6  United States
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The right kind of inductor!
Oon -

Click the image to open in full size.

Wrong tool for the job.

Why the reluctance to use the proper parts? Budget constraints or trying to use a common part in an uncommon way?
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