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Old 30th April 2009, 06:05 PM   #6051
norazmi is offline norazmi  Malaysia
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Thanks Dx,

Its 2N5401, i`ll check VBE multiplier again

Regards,
Azmi.
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Old 30th April 2009, 06:08 PM   #6052
norazmi is offline norazmi  Malaysia
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hmmm.. Yes DX, there is no voltage from point A to C, it should be read 2.7V right refer on your website, so the BD139 problem? or maybe both tips trans?

Regards,
Azmi.
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Old 30th April 2009, 06:08 PM   #6053
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Default I have found the mistake


This one.... correct value here is 4K7..... yellow, violet and red

regards,

Carlos
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Old 30th April 2009, 06:19 PM   #6054
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Default Check this under the board.


regards,

Carlos
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Old 30th April 2009, 06:37 PM   #6055
norazmi is offline norazmi  Malaysia
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Changed to 4.7K, and get 2.7V at VBE but still got high voltage at output trans leg 1&3 both npn and pnp.

For your information DX, the tip41c heat up (growing) and tip42 is cold.

I`ll check the board with your suggestion.

Regards,
Azmi.
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Old 30th April 2009, 06:48 PM   #6056
norazmi is offline norazmi  Malaysia
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Default Bias Check..

Hi Dx,

Here is the bias preview,

http://60.48.69.81:90/~azmi/bias.JPG

Regards,
Azmi.
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Old 30th April 2009, 06:56 PM   #6057
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Default Is this a resistance?... are you sure..have measured?


Check this please.

regards,

Carlos
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Old 30th April 2009, 07:00 PM   #6058
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Default I would be happy to see the bias circuit by the copper side


or wire side, to check.

regards,

Carlos
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Old 30th April 2009, 07:09 PM   #6059
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Default A good idea is to clean your board..photo not clear


too much brigh under the board... resine...clean with alcohol or Kerozene (aviation fuel)...or other petrol solvent you may have at home.

Even thinner can be used..but carefull with the other side..parts may melt.

ahahahah!

Is this a short?

Carlos
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Old 30th April 2009, 07:13 PM   #6060
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Default Only you can check all that stuff

Install your output transistor and protective resistances (alike everybody does)

And them tell me what is going on.

Image not clear...only you will be able to see thougth all this solder resine covering the board.

regards,

Carlos
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