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Chip Amps Amplifiers based on integrated circuits

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Old 21st February 2013, 05:59 PM   #11
Jay is offline Jay  Indonesia
Join Date: Feb 2003
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Originally Posted by KatieandDad View Post
The GainClones are only medeochre Med-Fi at best. If you are only after 50W try one of the Pass amps.
Yup, that's the truth. Chips amps are just for fun. Class-A amp will improve cheap speakers greatly (only very good speakers can sound as good with "mediocre" amp). But the most important benefit of class-A is that they are non-fatiguing and more enjoyable, even tho soundwise they don't sound quite different with class-B.
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Old 21st February 2013, 06:06 PM   #12
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Old 21st February 2013, 06:19 PM   #13
Mooly is offline Mooly  United Kingdom
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I wouldn't spend money on custom transformers, buy "off the shelf" and definitely not unless you have a specific requirement for a the extra 9-0-9 winding. Low voltage supplies are easy to take from the main rails anyway, certainly for preamps and that kind of thing. Protection circuits are fine if they work, more important might be one that gives a few seconds delay at switch on to stop thumps and bangs as the circuit stabilises.
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Old 25th February 2013, 04:15 PM   #14
kentxon is offline kentxon  Hong Kong
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i read those Pass F5 amp on some of the blogs... I guess start something easier, step by step with small success everytime is better.
Sure i know the Class-A are much better sound

Did some "homework" during the weekend about transformer.
May I know the RS PartNo. 223-8106 work for this?
It said 2 x 25 output with Primary 230v

thank you for all of your help
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File Type: jpg 223-8106.jpg (62.5 KB, 85 views)
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Old 25th February 2013, 05:26 PM   #15
Mooly is offline Mooly  United Kingdom
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That transformer would give around 40-0-40 volts DC when rectifed. That's to high for the LM3875.

"Sure i know the Class-A are much better sound" I believe that some say that
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Old 25th February 2013, 07:04 PM   #16
Piggy is offline Piggy  Hong Kong
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I am using a Nuvotem 300VA 2x25V, the max voltage I measured at the smoothing cap is 34V max. (I am using two 35A bridge rectifier)

The mains voltage in HK is 220V.

I know nothing about building an amp and I have no problem of the LM3886.... Do search the forum for the testing procedure before connecting the amp to the loudspeaker.
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