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Old 1st June 2012, 03:27 PM   #1
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Default would need more data on this amplifier

hello people, I have a doubt with this schematic, later we got on the page, thanks.
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Old 1st June 2012, 03:44 PM   #2
SY is offline SY  United States
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Which amplifier are you talking about?
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Old 1st June 2012, 04:05 PM   #3
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I mean this amp, I q is posted but did not have time to check out the forum, the questions I have are:
the value of the coil, if the 1N4148 diodes are mounted on the additional sink and many more that I can not remember, thanks and greetings.
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Old 1st June 2012, 05:13 PM   #4
wahab is offline wahab  Algeria
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There are transistors out of specification.

Have you a schematic with components referenced ?..
It would be easier to point the mods that MUST be made
for the amp to work reliably.
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Old 2nd June 2012, 12:25 AM   #5
Bonsai is offline Bonsai  Taiwan
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I would not build his amplifier. It's an amalgam of bits and pieces that makes me think it's a paper design.

Better to build the Leach amp (a balanced symmetrical design) instead, or the Honey Badger (a Lin topology amp - see top of the solid State forum for details)

The Leach is a classic amp from the early '80's that gets most things right and has been built thousands of times and is fully debugged.

The Honey Badger is a more recent design that incorporates some refinements to achieve very low distortion.

Both are very worthwhile, they have PCB's available and you can get loads of help and guidance from people on the forum.
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Old 5th June 2012, 08:59 PM   #6
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this circuit is in another part of the forum, what happens is that I do not use a lot of the forum, so I opened another post, greetings.
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Old 14th July 2012, 07:32 PM   #7
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hi all, I have another amplifier circuit, wanted to know if someone joined, I find it interesting
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Old 14th July 2012, 08:20 PM   #8
wahab is offline wahab  Algeria
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This one has even higher power supply voltage at +-95V....

If you build this amp , use a supply that is about half this value ,
one can only warn you that the original voltage is lethal.
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Old 15th July 2012, 04:17 PM   #9
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Are you just looking for high power to suit PA or you are looking for high fidelity? There is a lot more cost and time required to design and build an amplifier that does both.

The answer to your question about the output coil, post 3, is that it is universal, not normally related to the amplifier but to ringing due to the load, so a figure of 1.5 - 6.8 uH is typical. Occasionally, a designer will use a higher value to increase HF roll-off and thus improve the HF distortion figures. That's called specsmanship.

Personally, I too am impressed by large amplifiers with extensive circuits but for personal use, 100W is more than enough power to deafen me and annoy my neighbours.
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Old 17th July 2012, 12:49 AM   #10
RSK is offline RSK  Malaysia
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Default Arjol Amp

Check this out.
It sounds very good. I have build it as per sch.
Designed for PA use and sounds excellent for hifi.
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