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Old 9th July 2013, 09:05 PM   #891
wiljj78 is offline wiljj78  Philippines
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Quote:
Originally Posted by vargasmongo3435 View Post
0.o_ again ?

Regards
Juan
Yess...
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Old 9th July 2013, 09:26 PM   #892
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Default You can use any 50K or 100K potentiometer you find

wire it with the most short connections you can, a good shielded cable for audio and be happy.

Thank you forgiven, as you gave me the oportunity, together dear Project 16, to open my big mouth.

"Avoid preamplifiers video message to Corporation members":

http://www.youtube.com/watch?v=jLUgKzNzbtA


Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 9th July 2013 at 09:32 PM.
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Old 9th July 2013, 09:35 PM   #893
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I agree with you Carlos! I have build some amps with just good pot to adjust volume and they sound so good. I have try using many sources like: dvd, iPod, laptop, pc, mp3 and they played without hiccups. I guess it is in the design and gain of amp and the output of source. People always say the problem with impedance and inductance match. I build the B1 using matched transistors and top quality caps and I did not notice an improvement in the sound at all. What I do is I use the best quality potentiometer like TKD in line and I always try to use the shortest path from input to potentiometer and from potentiometer to amp board. and I use the shortest RCA cables from source to input of amp. This kind of passive integrated amplifiers are very well know. Just to name some: Acurus D100, Portal panache, Adcom, and Creek. but there are many, many more out here. if people do not use phono...go passive!!!

PS: In my M400 amp I use a 10K TKD pot.
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Old 9th July 2013, 09:36 PM   #894
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Default They will not be happy with uncle charlie....but i have to say what is the real thing

The brotherhood of believers and mystics will get angry dear Vargas.

What i am saying is the same i heard from this man, in 1981, during a dinner.

The man is Akio Morita......do you know the guy?....so...he is not stupid.

Thank you Lanchile..... thank you too.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 9th July 2013 at 09:46 PM.
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Old 9th July 2013, 09:41 PM   #895
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Quote:
Originally Posted by destroyer X View Post
Thank you forgiven, as you gave me the oportunity, together dear Project 16, to open my big mouth.

-----------------------

My tests were done with a double potentiometer 100K between the source and the amplifier and the return is great.
But I read somewhere that it would be better to fit a high impedance to a low impedance (buffer) and add the potentiometer.
Apparently it does nothing!

Regards!
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Old 11th July 2013, 09:48 AM   #896
AJT is offline AJT  Philippines
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Quote:
Originally Posted by AndrewT View Post
Measure the bias voltage (Vre) across the output emitter resistor.
this is how you get the output transistor idle current...

bias voltage to the input or base is measured somewhere else...
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Old 11th July 2013, 04:25 PM   #897
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Default Well... i see harmony....this way is better

thank you,

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 17th July 2013, 07:27 AM   #898
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Default I am glad i could reach 62 years old healthy

Dx birthday - YouTube

Thank you all by the friendship, the respect and support.

regards,

Carlos
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Old 20th July 2013, 10:25 AM   #899
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Default Increase the setting of the quiescent currents!

Hello Carlos!

Currently I have 2.50V on resistance of 10 ohms setting and how my DX is apparently perfect but heat sinks not very hot.
Is it possible to increase this setting and here is what would bring more?

Regards!
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Old 20th July 2013, 10:33 AM   #900
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measure the output bias at the output device emitter resistor.
Do not try to set up the output bias by lowering the supply voltage by 2.5V
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