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Old 30th April 2009, 06:13 PM   #6061
norazmi is offline norazmi  Malaysia
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Default Re: Is this a resistance?... are you sure..have measured?

Yes, its read 0.817Kohm...





Quote:
Originally posted by destroyer X

Check this please.

regards,

Carlos
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Old 30th April 2009, 06:15 PM   #6062
norazmi is offline norazmi  Malaysia
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Default Re: I would be happy to see the bias circuit by the copper side

Its BD139 i`ll check it again the connection.... Thanks alot DX...


Regards.
Azmi

Quote:
Originally posted by destroyer X

or wire side, to check.

regards,

Carlos
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Old 30th April 2009, 06:16 PM   #6063
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Default Only you will be able to see thougth all that resine..solder flux


Clean it to see shorts..otherwise will be difficult.

regards,

Carlos
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Old 30th April 2009, 06:50 PM   #6064
norazmi is offline norazmi  Malaysia
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Default Re: Only you will be able to see thougth all that resine..solder flux

Clean it up, not short.

Here is bottom view of the bias.

http://60.48.69.81:90/~azmi/bias2.JPG


Quote:
Originally posted by destroyer X

Clean it to see shorts..otherwise will be difficult.

regards,

Carlos
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Old 30th April 2009, 07:16 PM   #6065
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Default Seems fine your bias board.


Continue working ....because something is wrong.

BUT..install ouput transistors..heatsinks..insulate the ones to the heatsink..install protective resistances in series with plus and minus and check once again.

If not perfect..then continue, because for sure there are errors or defective parts.

Amplifier was tested hundred times..works fine and stable.

relax, work hard....and be happy.

Congratulations!..now you are very near to be happy listening a Dx Corporation nice amplifier.

regards,

Carlos
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Old 30th April 2009, 07:21 PM   #6066
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Default Yessssss!...the 2K2 resistance..from colector to base


is installed too...fine!

regards,

Carlos
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Old 30th April 2009, 07:41 PM   #6067
norazmi is offline norazmi  Malaysia
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Default Re: Yessssss!...the 2K2 resistance..from colector to base

Hi DX,

Yes its installed , now i`m checking parts one by one, i want to make sure i can have dx amp it very sure its great amp.

Check tip 41c ... ok
42c ... ok
bd139 ... ok

2n5401 both ... ok

now i`m checking all resistor to make sure it has right value and also my board if got any short

Thanks a lot DX being help me all day i`m happy with it.

continue work... i`ll report here if i got any update.

Regards.
Azmi


Quote:
Originally posted by destroyer X

is installed too...fine!

regards,

Carlos
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Old 30th April 2009, 07:54 PM   #6068
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Default Well... i am working too...preparing an amplifier to my daugther



So....you go working in your amplifier and old uncle will work into his own amplifier.

The transformer is beeing made once again... the new one will come with 110 and 220 inputs... you see there's no transformer inside..for a while only.

Go searching...soon you will find.

regards,

Carlos

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Old 1st May 2009, 02:32 AM   #6069
EMX_125 is offline EMX_125  Philippines
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DHR Turbo...


Hi... Sir Carlos thanks for your rEply..... You Means the DHR is Better t0 Use Mid Fequency ?
Because y0u said the high frequency and also some mid range
frequency ( voices ) I have a sound system But im not a satisfied my amp to drive a Subwoofer my amp is BOM PO3 p0wer Amplifier 2 fairs
of 2SA1301 and 2SC3280 a channel... s0 i need a s0me more power amp to drive a subwoofer....
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Old 1st May 2009, 03:44 AM   #6070
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Default The DHR Turbo is good for bass, midrange and treble


To use it only for bass you will be loosing, wasting, trowing out, a lot of good quality audio.

Was not made for bass..it is not a subwoofer amplifier.

The use of this amplifier, only for bass is a bad use...it is alike to use a good, modern, confortable and expensive car, alike a Mercedes Benz or a BMW, to transport stones, bricks and sand for home construction..... to construct buidings we use truck.

The soft suspension you have into a Mercedes Benz, the low internal noise you have into a BMW and leather seats will be damage doing such kind of job...all those features will be lost when doing such kind of work.

You need a dedicated amplifier..something made for bass only.

It is better to modify your own amplifier, the one you have, for bass reproduction, including more output pairs , increasing supply voltage, increasing the speaker output impedance including more speakers into the system.

The bass amplifier is a result of a design that used other kind of decisions while creating it..... DHR Turbo, and other amplifiers i have made, had not the needed decisions during creation stages to be used as a bass amplifier.

Much better than increase amplifier power is to increase system's efficiency...good speakers together good speaker enclosures can produce deep, nice and strong bass with 30 watts or less...so... the need of high power, enormous transformers, a lot of output transistors is a need when we have NO efficient speakers... the bad ones needs a lot of power to move.

The reason we have so many high powered amplifiers (more than 50 watts RMS in my subjective point of view) is because the enormous majority of speakers you find are not good.

Real good speakers reach maximum excursion (compliance) into the diafragm with 5 volts.....so... those ones, with something alike 3 watts will do the job.... and better than a thousand watts amplifier connected to a BAD 1000 watts amplifier.

I really think you should scan our forum.... searching for high powered amplifiers, those ones published as 1 kw or more.... those ones will be more correct to your power needs.

I will not modify my amplifier to subwoofer use, or to bass only use.

The exception is the Trust Bass..but that one is low power and was not tested , only created into simulator... and this means nothing or half of nothing...was not built and listened.

The Trust built and listened and tested was a full range.... all audio bandwidth...not only bass.

Here you have the DHR Turbo thread:



This is the DHR.... Dx High Resolution Turbo

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