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Old 2nd August 2013, 03:32 AM   #1
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someone joined or tried this amp? I have doubts about the value of the inductor ...
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Old 2nd August 2013, 04:13 AM   #2
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Do you know what is that inductor used for...

Gajanan Phadte
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Old 2nd August 2013, 07:31 AM   #3
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That's a copy of the SILICON CHIP magazine 500W amplifier from around 1995. It's similar, apart from the cascoded VAS, to a big "Blameless" type design for amateur construction. Many were built here at the time, even in stereo format for some real muscle and a small competition was held by the mag. for the best build.

If you want Hi-fi performance though, the later Studio 350 design is cheaper and much better. Search threads for that here, if you wish. PCBs are still available.
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Old 3rd August 2013, 04:04 PM   #4
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is that the inductor is used to protect the amplifier speakers, I think the issue of high frequencies, but my question was the value thereof, which are 21.5 turns of wire of a 1mm thick, but the overall diameter the coil is not specified ... that was my question, but I see the recommendation of "ian" and I think I'll build the design in December ... thanks and greetings to the forum ...
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Old 3rd August 2013, 05:17 PM   #5
jaycee is offline jaycee  United Kingdom
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The output inductor functions to isolate the amplifier from the effect of the speaker cable's capacitance. Its inductance value is not usually critical.
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Old 3rd August 2013, 05:19 PM   #6
jaycee is offline jaycee  United Kingdom
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Also the schematic does describe the coil diameter, it specifies it should be wound on a P30/19 coil former. A little googling and you get this:

http://www.ferroxcube.com/prod/assets/p3019.pdf
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Old 3rd August 2013, 05:20 PM   #7
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thanks jaycee
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