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Old 2nd June 2012, 04:45 PM   #1
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Default Dx Disintegrated Circuit - Dx Dc

It is a discrete amplifier to be released end of July 2012.

To be used as an auxiliary amplifier, able to put out from 1 to 20 watts RMS, depending the supply voltage and the output impedance.

To be feeded, as power supply, from 9 plus 9 volts (batteries in series) to 16 plus 16 volts supplies (transformer, rectifier and filters)

A simetrical supply is used, darlington transistors in the output, total of 6 transistors only...the smallest board as possible.

To be installed inside speakers, or small cabinets (enclosure)

To be an amplifier to PC, notebook, netbook, tablets, Ipod, Ipad, Cell Phone, Iphone, MP3 player, MP4 player, Tape recorders or any need of auxiliary power amplification.

Circuit is traditional, alike Dx amplifier (standard), to be tiny and to distort not more than 0.1% RMS (THD).

More details in this video:

Dx disintegrated circuit - Dx Dc - YouTube

Circuit will be provided after further testing (real world test).

A kind of board suggestion is shown in the image below.

regards,

Carlos
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File Type: jpg Dx disintegrated circuit.jpg (706.7 KB, 746 views)
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Old 2nd June 2012, 05:18 PM   #2
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Default The gain network was missed in the circuit board sketch

Also capacitors for output darlington transistors .

In the schematic i forgot a filter for zener noises.

Well .... what gonna decide the final schematic will be the prototype test.

regards,

Carlos
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File Type: jpg Dx Dc.jpg (451.5 KB, 652 views)
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Old 2nd June 2012, 05:33 PM   #3
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Default Included missed parts in the circuit board sketch

Here you have them included (gain network and output darlington neutralising capacitors)

regards,

Carlos
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File Type: jpg Dx Dc circuit board II.jpg (525.8 KB, 594 views)
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Old 2nd June 2012, 06:36 PM   #4
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If you want as smal as possible go smd
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Old 2nd June 2012, 07:09 PM   #5
qusp is offline qusp  Australia
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ahh but SMD is evil, didnt you know? =) automatically its bad amplifier hehe
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Old 2nd June 2012, 07:14 PM   #6
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Default Ahahahahah! .... SMD produces and result in a bad amplifier?

Well....i do think i was the one that made SMD by the first time in 1960....i was 9 years old...soldering at the copper side.... without holes in the circuit board.... it is good, maybe better as coupling is less.... less size, less body, less electromagnetic waves transmitted to nearby circuits.

I have not registered..but no one made this way before me...or at least i could not see in European and US magazines such kind of construction.... surface construction the way i use to make.

Maybe you do not know uncle Charlie my friend from Australia (Qusp)..... this is the kind of construction i love to make in my prototypes

I cannot Meanman... i just cannot....i cannot see, even wearing glasses.... and this is DIY, something to everybody build..old bugger alike me and young eagle eyes too.

regards,

Carlos
Attached Images
File Type: jpg Darlington TIP107.jpg (224.6 KB, 492 views)
File Type: jpg Dx Dc Circuit board.jpg (377.2 KB, 472 views)
File Type: jpg Surface assembled parts.jpg (203.9 KB, 169 views)
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Old 2nd June 2012, 07:19 PM   #7
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Complementary Darlington emitter follower with no emitter balast resistors....good luck with the bias stability.

I don't wear glasses for small size soldering either, but I do wear them when using rotary tools such as a Dremil or saw.
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Old 2nd June 2012, 07:24 PM   #8
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Default Oh! .... i forgot the emitter resistors! ... thank you.

I will install them.

But, by the way, the Dx amplifier have not used the power emitter resistors not to kill bass.... hundreds have assembled and no one have complained about bias stability...it uses a darlington too...an emitter follower that is almost a darlington...watch what you have inside this darlington, for instance.... see that is connected as a emitter follower (modified)

Not all that different.... gain is almost the same as the Dx amplifier output.

regards,

Carlos
Attached Images
File Type: jpg Not that different.jpg (18.6 KB, 181 views)
File Type: jpg Dx amplifier.jpg (71.7 KB, 253 views)
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Old 2nd June 2012, 07:52 PM   #9
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just in case you missed the sarcasm, that was sarcasm. I dont wear glasses full stop, the vast majority of builds I do are SMD, I much prefer to build smd and I actually think to build truly hi performance amp with parts made this century its unavoidable. I was just commenting on what appears to be popular opinion here and all over the web in audio circles, its quite funny. sometimes people will remove a high quality SMD part to replace with a part that is basically the same, but PTH, thus actually performs much worse.
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Old 2nd June 2012, 08:18 PM   #10
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Hi

I think that there is something else going on if adding small emitter resistors to the output transistors affects the sound. The effect of the emitter resistors is that they reduce the %difference in output resistance of the output transistor (intrinsic resistance) between large and small signal conduction. Analog electronics design is all about comprimise.

Remember that temperature co-efficient of the driver is multiplied not summed by the co-effecient of the output device. This means having them in the same package and thus the same temperature has a larger effect on overall temperature stability than using seperate descrete components for driver and output, hence the need for a Darlington Vbe multiplier. The overall effect of the emitter resistors on thermal stability will be larger as well.
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