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Old 13th February 2008, 05:07 PM   #521
weissi is offline weissi  Europe
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Great news... was ordering parts before, therefore I asked. But now it's too late, couldn't wait any longer well, I think parts are not the real problem

Click the image to open in full size.

Sorry for posing with that
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Old 13th February 2008, 06:37 PM   #522
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Default Man!... will send you my adress..to a small 1 percent of this stuff contribution


to fat Charlie.

ahahahahahah!

beautifull

I turn hipnotised!

My God..... sorry... i felt envy!

regards,

Carlos
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Old 13th February 2008, 07:10 PM   #523
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Default Well... i have not your stock of parts.


But do you have a daugther like mine?

ahahahhahah!


Carlos
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Old 13th February 2008, 10:25 PM   #524
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Well pm me your address Just stuff from surplus, me a lucky guy hmmm, beach and sun...

Well, back to the topic

If I supply the precision with a lower voltage (I have just a 2x50VDC supply here, next thing is 2x75VDC..), what difference must the Input stage against the Output stage have, just 63-55V?

And I don't want to see those radial 1000 on the board

Thanks Carlos, you're one person with a character all of us should have ! not joking...
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Old 13th February 2008, 11:05 PM   #525
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Default I felt myself confused with your answer dear friend


Please, try once again....will you operate with 55 volts?

Do you want to use 64 volts left amplifier side and 55 volts to power output?

Or you want to have 64 volts to the power unit and 55 volts to the left amplifier side (differential and VAS circuits)

I am confused..sorry...me stupid!

It is hot here Weissi.....my daugther was into the beach last weekend.... temperature is pretty to watch people into the beach but is something that cook everything you have...you know.... that thing cooks too!....because pants, shorts...you understood..very hot weather..not good!

regards,

Carlos
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Old 13th February 2008, 11:11 PM   #526
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Default I have prepared images to help Nordic and all folks to assemble


and then, debug problems that normally happens when we assemble amplifiers.

We always make some mistake..this is normal, this is human...because of that we are working hard, preparing boards to avoid too much problems.

Because, even with boards, we can assemble transistor with wrong pins..inverted, or we can put NPN in the place of PNP.

I have splitted into 2 images...amplifier left side and amplifier rigth side.

And you will have voltage left side and voltage rigth side
will have current left side and currente rigth side
will have VBE left side and VBE rigth side
will have modification rigth side and modifications left too.

I hope you understand what i have done....i have removed part numbers and values not to confuse..just showing you points and informations about those points indicated using arrows.

regards,

Carlos
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Old 13th February 2008, 11:17 PM   #527
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Default Well dear friends, voltages are measures with the black probe point


fixed into the ground... with solder or aligator clips.

then you measure with the red probe point.... with a digital multimeter voltages positive and negative will appear into the display.

Those voltages are the ones i am informing you.

This amplifier is using 72 volts supplies to power and the rail regulator are descending to 62 volts...a special sittuation, something dear nephew Nordic is testing in his home rigth now...he is using 2 transistors pairs into the output, to operate 8 ohms only...the idea is to test board layout.

Those voltage are sligthly different.... not the standard voltages suggested, and this, off course, will make some difference into the measurements, but not so huge as we can think...only the power transistors and drivers are into the positive rail and negative rail..so..theres you gonna have differences....but into VBEs and currents the differences will not be so big and the voltages will be helpfull to you even using different voltages.

Voltages there "makes sense"...so.... you can see, they are what you spect into those positions..nothing extraordinary into those voltages.

regards,

Carlos
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Old 13th February 2008, 11:20 PM   #528
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Default Current as measures in series with the circuit..so..you have arrows and points


The current is measured opening that point in installing the amperometer in those points.... an intercepted line has two points...so...one probe to each point.... 200 miliamps DC scale and check currents.

More normal currents are from colector to emitter..the ones interests us to measure, as others are very small and they are more controled by junctions and bias circuits.... the result of biasing circuits will have, as consequence, colector to emitter currents that you will measure to know if everything is running fine.

regards,

Carlos
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Old 13th February 2008, 11:30 PM   #529
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Default People love to know currents because shows circuit conducting.... and more than that

allow you to calculate power to resistances and transistors.

Power is current multiplied by voltage.... expressed, written in Amperes and Volts.... so.... 10 miliamperes is 0.010A ... and 545 milivolts is 0.545V

So, you will see that some resistances will need bigger values about heat dissipation....some will be 1 watt, and other 2 watts...and the biggest majority will work fine with half watt and 1/4 watt (or something around that).

The transistors, the rail voltage regulators, drivers and CCS transistors, also the Master VAS..all them are having 1.5 watts or something alike.

But have to increase, because this current is into the stand by mode, without signal.... when you introduce signal, some of them will have some increase and decrease of current following the audio swing...because of that, think on them as 3 watts each one..and this means 30 square centimeters aluminium exposed to the air (one side calculated, not both sides added)..means a piece of aluminium, lets say squared, around 2 inches the side dimension, around 5 centimeters...and those heatsinks can be made into "U" shape, it "L" shape or anything you find reasonable.... 2 small units back to back... two U shape back to back will work too.... you can even try a half of that..but you will feel some heat into the transistors..and this, into the drivers, can cause to you problems as temperature drift.... current because of that goes increasing while the amplifier is going to be hot.

I love printed circuit heatsinks, using the copper...lovely idea Nordic had..but to this amplfier...really...no way!

regards,

Carlos
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Old 13th February 2008, 11:33 PM   #530
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No, I meant that 63V is the total supply, whereas the 55V are meant to be the sum of the Z-diodes 22V and 33V (so I call this the input stage voltage..)

Thanks again Carlos.


Edit: Huh, Am I slow....?
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