Destroyer x Amplifier...Dx amp...my amplifier - Page 201 - diyAudio
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Old 30th June 2007, 06:17 PM   #2001
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Default Re: Re: Re: Destroyer X

Quote:
Originally posted by juergenk

can you give an example?
this is a typical arguement in the valve vs. silicon debate.
However, everytime I look onto published THD charts, the THD vanished into noise at low levels.
regards
Hello

As you can see those graph for a LM3886 chip amp, the distortion are raising at high frequency and at low level output, remeber that in a transient situation on a real speakers it will be worse.

Gaetan
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Old 30th June 2007, 07:18 PM   #2002
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Default To my friend Riche sine instructions.


R6 - please use 3K9

Vr1 - first adjustment set it to 2800 ohms

Vr3 - start with 736 ohms

Prefer to introduce attenuator in the input (i will provide image) to avoid tweak the gain network...keep R10 into the standard value ...having too much signal level into the output...then, install resistive attenuator.

Introduce the 100N.... image will be provided.

Each output transistor (minimum of 2 pairs) will need it's own base resistance and emitter resistance.

Adjust current from 60 to 100 miliamperes.

Adjust your off set to lower than 4 milivolts.

And be happy!

" Dx amplifier is not a ghost....it exists and playing in many places around the world....also near me "

regards

Carlos
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Old 30th June 2007, 07:20 PM   #2003
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Default Please, observe the image was made now!


It is playing...and very nice.

Signal must be adjusted in level to the amplifier input.... made to work fine with 750 milivolts....adjustments will be needed to use higher levels...and above some certain level it will distort anyway.

regards,

Carlos
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Old 30th June 2007, 07:22 PM   #2004
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Default The amplifier is very strong into the bass area


You can watch a single cicle moving slowly the speaker diafragm.

So.... if you have noises, subsonic tones...better to reduce your input condenser till 82N

See the image.... 10 Hertz!.... pumping 80 watts RMS.

The unit is a bomber...or a bombardier.

regards,

Carlos
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Old 30th June 2007, 07:23 PM   #2005
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Default Riche, mon frère, as you intend to produce a thunderstorm inside your home...


I will post some images, showing the suggestions....

Carefull.... more than 300 undistorted watts over 4 ohms is dangerous...to your speaker and health!

regards,

Carlos
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Old 30th June 2007, 07:26 PM   #2006
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Default This is the input attenuator...add those two resistances....yeah


keep the circuit as published in Greg forum.... those resistances are soldered under the board...and insulated with plastic tube.

This will make the amplifier hold 2 Volts of audio.... 2 Volts RMS of audio without distort.

regards,

Carlos
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Old 30th June 2007, 07:28 PM   #2007
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Default R6 will feed the differential and the zener.


zener current is almost ten times the long tail current.

But with your voltage increase, the zener will work too much hot and can burn...this way, replace the 2K2 original resistor by a 3K9 one.

regards,

Carlos
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Old 30th June 2007, 07:29 PM   #2008
Nordic is offline Nordic  South Africa
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If you don't like the DX sound, you need a new pair of these...
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Old 30th June 2007, 07:32 PM   #2009
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Default Exactly....better to replace ears....was hardly tested, checked and compared.


If you dislike Dx sonics....better to replace your ears.

ahahahaha.


fine!

thank you Nordic.

regards,

Carlos
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Old 30th June 2007, 07:35 PM   #2010
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Default You will have, dear Riche, one of the new pair of constructors..together handsome

guy.

The current that will be crossing the Dx amplifier will be very big.

this will produce variations in the supply voltage...better to decouple the off set trimpot using a capacitor.

Customized for high power versions.

Please, install this new capacitor to high powered versions only.

regards,

Carlos
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