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Old 28th July 2011, 12:56 PM   #101
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Join Date: Oct 2006
Location: Belgium the land of chocolate
Quote:
Originally Posted by evette View Post
Hello can you please put me in for 6, Thank you very much. Evette
Evette,
Did you order 4 boards here and 2 boards at SMPS forum?
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Old 28th July 2011, 04:12 PM   #102
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Join Date: Jun 2004
Location: Champaign, Illinois
Quote:
Originally Posted by ByronInLawrence View Post
50 are being made. If we go over 50, send me an e-mail anyway. Some people may back out.

If you see an error on the list, send me a PM please.
Hi Byron,

Thanks for your hard work. It looks great (and large!) With its pedigree it should sound wonderful.

I just wanted to be sure that I have not perhaps missed the payment request, or is that still coming? Will you make the request here on the forum or send individual email or Paypal invoices?

Francois
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Old 28th July 2011, 04:34 PM   #103
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Location: Recife - Brasil Northeast
Default Dear Evette... i have asked you to reduce your order

Please, dear Evette, confirm your quantity of order here...i do know you will keep order to Meanman group buy...i would like to know the quantity here...to confirm...you have asked 6....but maybe you will reduce.

Boys.... condensers you have in the power amplifier pcboard are auxiliary...they are there to fill the gaps...without them we had too much empty space there... board without anything on it.... free space...room to be filled with something.... then Alex decide to put condensers...and this was a very good decision.

Try to imagine this board without them, will be ugly .... so, they are there to add more capacitance..this way, your power supply will not need to have all capacitors there...you will have a smaller power supply..so..saving space into the power supply and using free space we had in the audio power amplifier pcboard.

Power specification charts (MKIII thread) show you the transformer power, also the needed current considering each particular situation ...say...8 ohms or 4 ohms or 2 ohms...also if you will use a single supply or if you will use two power supplies...there you can realize the fuses....but i will prepare (soon) a chart informing fuses to each particular situation.

Tekko.... go back some posts and you will see price.... also Byron will soon inform you.

regards,

Carlos
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Old 28th July 2011, 05:03 PM   #104
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Carlos, I think Evette needs 6 boards but also said to keep 2 boards at the SMPS groupsbuy but I saw in Byrons quote list only 2 boards that's why I responded
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Old 28th July 2011, 05:13 PM   #105
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Default Here you have power specifications and a link to MKIII-hx thread

Informing you about fuses....here:

Dx Blame MKIII Supercharged will soon be released

regards,

Carlos
Attached Images
File Type: png Power specifications 1.png (35.1 KB, 386 views)
File Type: jpg Power 2 specification.jpg (139.1 KB, 377 views)
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Old 28th July 2011, 07:16 PM   #106
tome is offline tome  Macedonia
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hi
I will take 2 boards

thanks
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Old 28th July 2011, 07:24 PM   #107
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by destroyer X View Post
Please, dear Evette, confirm your quantity of order here...i do know you will keep order to Meanman group buy...i would like to know the quantity here...to confirm...you have asked 6....but maybe you will reduce.

Boys.... condensers you have in the power amplifier pcboard are auxiliary...they are there to fill the gaps...without them we had too much empty space there... board without anything on it.... free space...room to be filled with something.... then Alex decide to put condensers...and this was a very good decision.

Try to imagine this board without them, will be ugly .... so, they are there to add more capacitance..this way, your power supply will not need to have all capacitors there...you will have a smaller power supply..so..saving space into the power supply and using free space we had in the audio power amplifier pcboard.

Power specification charts (MKIII thread) show you the transformer power, also the needed current considering each particular situation ...say...8 ohms or 4 ohms or 2 ohms...also if you will use a single supply or if you will use two power supplies...there you can realize the fuses....but i will prepare (soon) a chart informing fuses to each particular situation.

Tekko.... go back some posts and you will see price.... also Byron will soon inform you.

regards,

Carlos

condenser location is good Carlos , ( close to outputs ) and in this case can be second stage of Capacitor bank ...
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Old 28th July 2011, 08:19 PM   #108
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Default Good Wayne...that's it.... the second stage of capacitor bank

Exclusive technology from the Corporation.... and by Wayne.

Good!

regards,

Carlos
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Old 28th July 2011, 08:28 PM   #109
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Quote:
Originally Posted by Francois G View Post
Hi Byron,

Thanks for your hard work. It looks great (and large!) With its pedigree it should sound wonderful.

I just wanted to be sure that I have not perhaps missed the payment request, or is that still coming? Will you make the request here on the forum or send individual email or Paypal invoices?

Francois
Payment requests will go out individually via PM or e-mail when the boards arrive, and I've checked them. By "check" I just mean test for continuity or shorts and look for obvious mistakes. Different buyers will pay different shipping, depending on location.
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Old 29th July 2011, 11:27 AM   #110
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Default About adjustments.... some details about

I am uploading video about...but here you have some images attached.

A new updated schematic is attached too, the 8K2 resistance was removed, as it was there to adjust off set only...in the reality it does not belongs to the schematic...some guys may use if needed, others will not.

When differential pair has matched transistors we do not have huge off set.... manufacturers accept off set up to 25 milivolts...and 300 milivolts of off set (huge one) represents only 11 miliwatts (0.011W) and this is nothing, or half of anything..will not move your speaker, will not harm your amplifier, will not produce sound when you power your amplifier on..so..do not worry.....BUT..if you want, you can fix and images shows how to do that.

You will see that Miller capacitor, the compensation one is 56 pf in the schematic....not correct, this is for future tuning and i will have to show you a safe way to do that without destroy your power output transistors...use 180pf as before.

Bias transistor can be anyone you find in your junk box...the plastic ones (material that has plasticity, not real plastic) are insulated and does not need washer, insulator and all that stuff is absent..not needed for them..so, it is more better..... transistor there will face (bias circuit) a few miliamperes and 2.2 volts..power there is very small..also voltage there is 2.2 volts as i said.... any transistor will fit...BUT.... each transistor has it's proper gain..so, the base to emitter resistance network should need adjustments in order to achieve the correct bias for this transistor that will supply 2.2 volts to bias the drivers and output trainees.

Bias point, or bias current, suggested, must be very low..in order to keep heatsinks cool while in stand by mode.... 1 milivolt measured as voltage drop across the power emitter resistances is all you need...of course you can change this in order to follow your ideas and beliefs....it is up to you..but you gonna be responsible for that..not uncle charlie.

The bias transistor is also a thermal compensating device...when heatsinks goes hot, then this transistor goes hot too..when it is hot its internal resistance drops down.... so, the previous 2.2 volts adjusted (from coletor to emitter) will be no more 2.2 volts..it will reduce...in the reality, when hot, your amplifier will show you much more current in stand by mode..and bias transistor will help to control that for you ..please, do not adjust your amplifier while hot..because when it return to a cool operation it will be underbiased or will have output transistors off, operating as class B, and this distorts low level signals.

I hope this helps.

regards,

Carlos
Attached Images
File Type: jpg Bias transistor.... BD139 in place.jpg (131.3 KB, 332 views)
File Type: jpg MJE15030.jpg (46.5 KB, 320 views)
File Type: jpg Off set adjustment resistor.jpg (115.5 KB, 311 views)
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