Destroyer x Amplifier...Dx amp...my amplifier - Page 606

norazmi · 30th April 2009, 05:05 PM

Thanks Dx,

Its 2N5401, i`ll check VBE multiplier again

Regards,
Azmi.

norazmi · 30th April 2009, 05:08 PM

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.

destroyer X · 30th April 2009, 05:08 PM

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

regards,

Carlos

destroyer X · 30th April 2009, 05:19 PM

regards,

Carlos

norazmi · 30th April 2009, 05:37 PM

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.

norazmi · 30th April 2009, 05:48 PM

Hi Dx,

Here is the bias preview,

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

Regards,
Azmi.

destroyer X · 30th April 2009, 05:56 PM

Check this please.

regards,

Carlos

destroyer X · 30th April 2009, 06:00 PM

or wire side, to check.

regards,

Carlos

destroyer X · 30th April 2009, 06:09 PM

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

destroyer X · 30th April 2009, 06:13 PM

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

30th April 2009, 05:48 PM	#6056
norazmi diyAudio Member Join Date: Feb 2008	Bias Check.. Hi Dx, Here is the bias preview, http://60.48.69.81:90/~azmi/bias.JPG Regards, Azmi.

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30th April 2009, 05:05 PM	#6051
norazmi diyAudio Member Join Date: Feb 2008	Thanks Dx, Its 2N5401, i`ll check VBE multiplier again Regards, Azmi.

30th April 2009, 05:08 PM	#6052
norazmi diyAudio Member Join Date: Feb 2008	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.

30th April 2009, 05:37 PM	#6055
norazmi diyAudio Member Join Date: Feb 2008	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.