The best amplifier i have ever listened too..i am glad to present you the Dx Blame

stewin

Member
hi Carlos i live in east Africa . i saw your amps on diyaudio but never got to build the dx. when i saw this thread i purposed i was going to build it to and to hear it.
i just finished building the dx blame i will try to post the pictures later .
to my surprise the amp was super clear i am using my pc for playing music with the amp. truly of all the amps i have assembled this has very clear definition from the bass to mid to the high frequency i used 2sc3281 and 2sa1302 for outputs, driver stage i used tip41 and tip42 voltage used was +/-40vlts, also included fan to the heat sink after adding fan it runs cool even at high volume levels.
one of my channel failed today as i was using 3ohms (may be because of output 3281 and 1302 cant handle 3ohms at +/-40vlts) . after failing i used the remaining one channel and wired both my left and right speakers in series which gave me 6ohms now i am playing it loud and no problems .
the amazing thing about this amp is the clarity or definition although +/-40 it is clear and powerful.
 

destroyer x

Compulsive builder
Thank you Stewin, i am glad you have appreciated.

BD139/140 use to produce better sonics because they can reach higher frequencies (Ft), this results in better slew rate and better definition (resolution) in high frequencies..... if you like it using TIP41/42, means to me you will be much more satisfied after you replace by BD1349/140.

TIP41/42 cannot go to high frequencies, observe the datasheet, this results in lower speed at audio frequencies in the top or audio spectrum..... the BD139 and BD140 can go to 100 Megahertz or more, they were used as drivers in Radio Frequency transmitters operating at 27 Megahertz (Citizen Band - CB) and also used as output from FM transmiters at 108 Megahertz.

You may say TIP can go to 10 megahertz (i do not remember exactly the top frequency with 3dB roll off).... and this is much bigger than 20 kilohertz (top frequency for audio)...despite it SEEMS can operate fine....this results in lower speed, slew rate speed change the wave form, and this appears in the audio reproduced, in other words you may be loosing some audio quality.... also BC546 and BC556 where replaced by many others and no other ones sounded the same... the best option is really the BC546 and BC556...they are absolutelly matched into this circuit.

Your output is fine...if not fake (there are a lot of factories producing fake units from this model you're using).... they use to be good..to operate fine.

Yes..... 3 ohms is a hard load for this amplifier, in special because three ohms, usually, show lower impedance in some frequency of the audio spectrum...it is not always three ohms and not 3 ohms in all frequencies....it is a torture that usually burn the output... single pair was used to save your money.... to use lower impedance or higher voltage in your supply you need more output pairs.... speaker impedance is not a flat horizontal line in the XY impedance graphic.... 3 ohms specification means it is 3 ohms at 1 Kilohertz, but at 20 hertz the impedance is different.

regards,

Carlos
 
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stewin

Member
thanks so much Carlos i am not a pro when it comes to the math and explaining how it works that's why i was puzzled . BTW congrats that amp sound is amazing and sounds like a dream, i mean it is so clear even at frequencies 200hz to 16khz very crisp and full of details . before making your amp i had tried many amps (obviously diy ones) and was thinking my problem was my speakers ''because they are cheap Chinese ones, i had thought of importing fostex from USA . but when i built your amp my speakers performed great and i heard good sound out of the same speakers i was despising.

sorry for many questions but if i am using +\- 40vlts can i use a pair of tip35 and a pair tip36 for outputs. They can handle 25 amps 100vlts 125watts
 

destroyer x

Compulsive builder
Thank you Stewin..you are welcome.

[video=youtube;3Jk-MHSH404]http://www.youtube.com/watch?v=3Jk-MHSH404[/video]Thank you Stewin...i hope you will enjoy more and more your sound equipment using a Dx unit together your system....soon you will have better speakers and better sonics as you have identified a weak point in your audio chain (speakers).

regards,

Carlos
 

destroyer x

Compulsive builder
I have installed a Dx Blame ST amplifier inside this Durabrand 2.1 home theater

Not anymore a Durabrand, now a days it is a Dxbrand.

Treble channels (original) are putting out 400 miliwatts RMS each channel, the bass channel is a 10 watts RMS Dx Blame ST amplifier, green brazilian boards, and it is pumping around 2 watts RMS over a 5 inches chinese speaker installed originally inside the Durabrand case.

regards,

Carlos[video=youtube;6hvQvQ0ERio]http://www.youtube.com/watch?v=6hvQvQ0ERio[/video]
 

Cantunes

New member
Hello Carlos, I made some changes to the layout of the red plates so as to place a larger capacitor and also put the two transistors Q9 and Q10 to the side of Q8.
I do not know if everything is correct, because I could not do in the Eagle and used paint of windows 7.



Cantunes
 
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destroyer x

Compulsive builder
Very good job Cantunes

But lines are too much thin...say... copper lines... this may detach from the fenolite or even fiberglass board when receive heat from soldering iron...thinner is good to reduce capacitance..but too much thin may detach.... if you have to repair the circuit, then you may have detached copper lines... when they are thin, the distance in between them and nearby tracks results increased..and this may be a nice advantage as you will be reducing capacitances... but the counterpart is the disadvantage they are not very strongly attached to the fiberglass or fenolite base.

As linhas de cobre, as trilhas, me parecem muito finas.... isso pode causar o descolamento dessas linhas do substrato de fenolite ou fibra de vidro quando essas mesmas trilhas receberem calôr proveniente do ferro de soldar... linhas finas são otimas, elas aumentam a distance entre elas proprias e a linha adjascentes.... mas quando são muito finas poderam descolar fácilmente... daí é problema..no primeiro conserto que vieres a fazer vais ter trilhas descoladas.

regards,

Carlos
 

destroyer x

Compulsive builder
Good o strengthen the tracks my dear...thank you

Watch what Horacio (brazilian) have made.... very pretty amplifier.

regards,

Carlos
 

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destroyer x

Compulsive builder
Some pictures i have received from Mr. Horacio Fuzie from Brazil

Images attached.

regards,

Carlos
 

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destroyer x

Compulsive builder
Newton, a Brazilian friend, installed VU meters in his Dx Blame ST

[video=youtube;jJlz2tzWN5w]http://www.youtube.com/watch?v=jJlz2tzWN5w[/video]watch it here.

Picture shows 2 units stacked one above the other.... upper is the Dx Blame ST and the lower one is Dx Blame MKII Supercharged.

regards,

Carlos
 

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destroyer x

Compulsive builder
Newton made video to share his Dx Blame ST and Dx Blame MKII Supercharged pictures

with us.

Thank you Newton.

regards,

Carlos[video=youtube;SxjCcTNdtkY]http://www.youtube.com/watch?v=SxjCcTNdtkY[/video]
 

destroyer x

Compulsive builder
Upgrade and update about Dx Blame series of audio power amplifiers

This is in English....soon i will publish in portuguese[video=youtube;d5v8gyrAo-4]http://www.youtube.com/watch?v=d5v8gyrAo-4[/video] too.

regards,

Carlos
 

destroyer x

Compulsive builder
Dx Blame amplifiers update and upgrade... atualização dos Blames

Here portuguese (from Brasil) language

regards,

Carlos[video=youtube;mozDI0hmev8]http://www.youtube.com/watch?v=mozDI0hmev8[/video]
 

thiago alves

New member
for those who read and did not understand, I drew!
have two ways.
OVER BOARD



UNDER THE BOARD
just cut the track with a knife and solder the 1K resistor


And have a nice day!!!
flow !
 
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destroyer x

Compulsive builder
Yes, you can do this way..but does not look very good

É meio feioso esse treco.... parece improviso...porque de fato é um improviso.

abraços,

Carlos
 

thiago alves

New member
É meio feioso esse treco.... parece improviso...porque de fato é um improviso.

abraços,

Carlos

mais e o tipo da coisa que vai ficar dentro de uma caixa, so vai ser visto quando for aberto para ter algum reparo " se tiver reparo"

aesthetically ugly, but what's happening inside the box and will only be open when you do a repair "if repair"

See U!!!
 
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