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Old 5th May 2014, 08:00 PM   #1541
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Default A forum friend sent me private message asking Dx Supply layout

I said that i suppose it was already published as we cannot force people to buy stuff from us.... we have to give them all information needed.

I do imagine it was already posted.....please Juan, point to the guy were is the post with the layout to the Dx Supply to be etched at home.

He said want to make by himself.... cost of shipping to Europe is now a days too much expensive, so, he do not want to order pcboards.

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 9th May 2014, 07:28 AM   #1542
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Quote:
Originally Posted by destroyer X View Post
I said that i suppose it was already published as we cannot force people to buy stuff from us.... we have to give them all information needed.

I do imagine it was already posted.....please Juan, point to the guy were is the post with the layout to the Dx Supply to be etched at home.

He said want to make by himself.... cost of shipping to Europe is now a days too much expensive, so, he do not want to order pcboards.

regards,

Carlos
Dear Carlos,
I will use PCB, which are already published in #986 .. I hope, that they are OK..It´s Zimmer design...
Regards,
Marcel
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Old 9th May 2014, 09:56 AM   #1543
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Default Yes.... pcboards tested.... published layout checked

I am using it at home....i have three unit etched at home inside my amplifiers..and the one show is being installed in my workbench.

Workbench unit is to 20 plus 20 watts dissipation only... voltage entering is 40 volts when lightly loaded .... if i adjust it to 36 volts to a modern JLH (for instance) then i will have 8 to 10 watts each rail drained from the supply.

"Input voltage minus output adjusted voltage multiplied by the ampere drained is the power you will be asking from the supply"

Juan Supply pcboard was not assembled because lack of some capacitors in my stock...but it also works fine.

Sorry...pictures distorted because of camera lenses

Be aware about the wire jumpers.... cannot forget these links made with wire..... leads of resistors or telephone wire.... i use to forget them....as a result sometimes things i assemble fails

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 9th May 2014 at 10:04 AM.
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Old 9th May 2014, 10:46 AM   #1544
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Default Attention, atención, Atenção, Achtung, Atento, внимание

Be aware about jumpers.

Carlos
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Old 15th May 2014, 07:11 PM   #1545
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Default DX Blame SA rivals with high-end hardware!

Dear Carlos!

I have spent the day with a friend to compare my DX Blame SA with high-end hardware.
The preamplifier was a "Advance Acoustic X-Preamp" for the listening test and a comparison amplifier "Advance Acoustic X-A160" and the speakers of "Mulidine Space".
DX Blame rivals smoothly with the high-end hardware, can not decide between the two amplifiers. Both amplifiers produce the same sound transparent and detailed.
In summary, the DX Blame SA is a great success!

Regards!
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Old 19th May 2014, 08:41 AM   #1546
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Default PCB

PCB´s are already finished..let's drill....
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Old 19th May 2014, 09:03 AM   #1547
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Very good job "maxwell"!
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Old 19th May 2014, 10:22 AM   #1548
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Default It can beat the competition dear Project 16

Because of reliability and difference in gain in parts used, i have decided by a very big compensation capacitor.....when we reduce the value you have clear increase in high end and all harmonics (natural ones) are reproduced..so...bells and whistles appear in your room shinning and reflecting in your walls,

You can reduce..but you must watch a scope and plug audio or generator..better to be generator, 10 watts and square wave...try high frequencies..above 5 kilohertz.... plug and unplug the signal...watch for unstabilities show in the scope....no unstability..then reduce a little bit.

You can go from 220pf to 180pf to 150pf, to 120pf to 100pf, to 82pf, to 68pf to 56 pf and do not go down because for sure you will face problems.

With a multimeter, in AC scale, measuring the output you can also "see" the unstability that gonna appear as AC output..the meter will show some volts...without any signal entering the amplifier.

For the bass you can increase input capacitor and gain capacitor.... go twice and test....also if you decrease emitter resistor, installing other in parallel you gonna have more bass because resistors in series with the signal (the case of the power transistor emitter resistor) kills the bass.

Then you will kick the competition.

Understand that i cannot put that stuff in the schematic..as this is something we have to try in a try and error basis and i cannot offer this as standard..but if you want to take the risk..then tune your to beat all that crap stuff exist around you ...expensive stuff that cannot make music better than it really is in the original..amplifiers can only put out the real recorded sound...magic not allowable, even if they cost 100 thousand US dollar

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 19th May 2014, 10:24 AM   #1549
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Default Nice work Maxwell007

Very nice work...also excellent pictures..great photo machine you have.

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 19th May 2014, 11:14 AM   #1550
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Default Reducing the compensation capacitor, the effect is the increase

in high frequencies quality..but there's a limit... if you cross the limit line the amplifier will oscilate...the smaller the better....but also, the smaller the less stable.

So, there's a compromise..... when we make amplifiers to people to assemble, we use two step up (minimum) to have the amplifier very safe, even if the guy change the VAS transistor model or replace with units with different gain and electrode capacitance...so...you have room to tweak and to tune it to be "parfait!"

How you see this...an easy method.

Connect a sinusoidal generator in your amplifier input..then couple a oscilloscope into the output terminal and load the amplifier with speaker or resistor... then start with 10 kilohertz and watch the sinusoidal waveshape in the scope display...then go increasing the frequency..you will see that with 220pf the waveform becomes a triangle at 40 kilohertz..and that if you install 68 pf you can go to 80 kilohertz without distortion....in this case is the waveform shape distortion that produces the audible distortion, as triangle wave sounds different from sinusoidal wave.

Yes...for sure you may say....but i can listen 16 thousand or 18 thousand maximum... so... do not make sense to worry about so high frequencies..... but you can listen the harmonics...and the sound becomes harshing, different, looks to be another instrument.... also the level (volume) of high frequencies are modified and a lot.

So, it is not a matter of audio purity, is also a matter of ballance of tones..the level of treble..the volume into the high frequencies

regards,

Carlos
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Convertion of 8 speaker output wire into standard 2 wires; https://www.youtube.com/watch?v=toZjKw3uUMo; Unbeatable!; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 19th May 2014 at 11:25 AM.
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