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APEX SX9
#41
Dragane podeli svoj rad na diyaudio.com mislim da moze da bude zanimljivo uz to kako kaze TDA plocica je skoro gotova Smile
APEXaudio.MileSlakovic
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#42
Biće danas...
Face up...make your stand and realise you're living in the golden years!
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#43
Da li može da prođe?

80x80mm
Face up...make your stand and realise you're living in the golden years!
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#44
Spoji levi pad na otporniku 1k (ulaz).
Grupa na ulazu (1k, 22k i 100pF) bi se mogla zarotirati u smeru kazaljke na satu, malo povecati razmak izmedju padova za kondenzator, i onda ispod ovih komponenti spojiti otpornike 4k7/1W.
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#45
Hvala Bob03.
Ispravljen je ulaz.
Nisam hteo da povratnu spregu provlačim ispod ulaznog kondenzatora.
Ovako je nekako najbezbolnije pošto vodovi se preklapaju najmanjom površinom.
Face up...make your stand and realise you're living in the golden years!
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#46
Ukoliko nema više predloga za isprvku-doradu, ovako bi izgledala pločica.


.lay6   APEX SX9 V.3.lay6 (Size: 140,68 KB / Downloads: 5)
Face up...make your stand and realise you're living in the golden years!
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#47
Imenjače, zar 1K i 22K na ulazu ne bi trebali biti spojeni?
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#48
Izvini, gledao sam gornju sliku, a ne zadnju...
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#49
(03-20-2018, 07:50 PM)Millan Wrote: Imenjače, zar 1K i 22K na ulazu ne bi trebali biti spojeni?

Wink
https://www.youtube.com/watch?v=0p_1QSUsbsM
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#50
Na diyaudio,com su mi zamerili zato što se izlazna zavojnica nalazi preblizu ulaznog kondenzatora.
Evo još jedne ispravke.


.lay6   APEX SX9 V.3.1.lay6 (Size: 140,82 KB / Downloads: 3)
Face up...make your stand and realise you're living in the golden years!
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#51
I još malo premeštanja i zamene vrednosti da bi se uklopilo u Dragan100 šemu V.1.1




.lay6   APEX SX9 V.3.2.lay6 (Size: 142,03 KB / Downloads: 6)
Face up...make your stand and realise you're living in the golden years!
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#52
@Dragan100 i apexaudio
Momci,
već dugo se spremam da napravim APEX F8R.

Da li možemo i njega ovako da uredimo, pa da crtam pločicu?
Face up...make your stand and realise you're living in the golden years!
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#53
http://forum.yu3ma.net/showthread.php?tid=1838
Face up...make your stand and realise you're living in the golden years!
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#54
(03-21-2018, 03:41 PM)TDA Wrote: I još malo premeštanja i zamene vrednosti da bi se uklopilo u Dragan100 šemu V.1.1

Hello,
Has anyone built this SX9?
How is the sound quality please.
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#55
SX9

Poslije @RSK pitanja dobio sam email Raj-a:

Hello Dragan,
I make PCB for SX9 amplifier. Hope it will fire up well.
Attached pic please find.
Will update you once populated and test.

i evo sličica u prilogu

Kratki odgovor je slijedio:

HI Raj,


PCBs look fantastic
I haven't reviewed the PCB routing, but I hope everything is OK
Populate the PCB and Mount appropriate HeatSink on:
-VAS
-Drivers+Vbe_multi sensor
-and Main Heatink for OPS BJTs
Use isolators and term-grease for heatsink mountings

To turn on the prototype you need:
+/- PSU 45VDC UNREG, +/-5VDC is normally OK!

on RAILs  (POS and NEG) you must put additional resistor current limiters ala 10 ... 15R several W
that would be an additional precousion note for Power ON current limit!
Trimmpot for OffSET set to 80...90%
Trimmpot for BIAS set to max,
so you will start with minimum (or none) output BJTs BIAS current,
jou will be on start deep in Bclass OPS operandum,
in fact, the output CFP will be completely closed and pull the current below 1mA!!!
Short the input to SignalGND (or GND, if there is no additional resistor between Power and Signal GND)
Put 8R0 resistor (6R0...10R) on SPK output (make it several tens of W Power)
POWER ON!

If the PCB is routed OK, the elements placed on the PCB according to the scheme, the AMP should work.
The output offset will most likely be in the +/- 100mV range, which is OK

Output BIAS, voltage measured via both 0R33 output resistors will be low at the start
as we set the BIAS trimmpot at the start to MAX, resulting in a minimum BIAS current.

If we have almost the voltage of the connected RAILs after the limiter resistors in the RAILs,
it means that the AMP pulls only a few tens of mA, and now the first Power ON is OK.
IF NOT, we must go now for DE-BAGGING!!!
Hope no need for...
:-)

Everything OK:
Now gradually rotate the trimmpot BIAS to have a monitored voltage (via DMM mV range DC)
drop across both output resistors {0R33 + 0R33} in 1...5mV range,
which gives us an initial output BIAS of around 1...5mV / 0R66 = 1,5...7,5mA.

Now use the OFFSET trimmpot to set the output voltage symmetry
of the output voltage Offset to be as close as possible to 0.0mVDC

We set then the BIAS trimmpot again to have a drop across both output resistors in the 40mV range,
which give as 40mV / 0.66R = 60mA BIAS
+/- 5mV will be quite OK.
Readjust OFFSET and BIAS  several times in the first 30min of AMP operation.
Monitor temp of all heatsinks.

Look for BIAS-OFFSET-TEMP variations stability.

Monitor with DMM mV range DC voltage drop on VAS R9 or R10 (100R)
we expect around  900mV...1V voltage drop! 
It is 9...10mA VAS Bias

If everything is now OK,
Power Down the AMP, wait for RAILs to go to 0VDC, one minute will be OK,

then eliminate RAILs resistors limiters and continue for additional testings without current PSU limitations
with Signal generator (SG) on input and Oscilloscope on output 8R0 LOAD,
put SG on Sinus, force Sinus to output klipping (+/-45VDC PSU---> 40...42Vpeak klipping), 
measure RAILs drop on max LOAD-at soft klipping,
then put 10KHz square wave input for 80% output (if 40Vpeak is Sinus klipping - then use 30...32Vpeak square wave OUT), to see:
-Overshoot
-Ringing
-Settling time
-Rise and Fall times
and then we accordingly put additional compensations and/or reduce existing ones....
to set SlewRate to max possible on this type of topology, readjust biases, compensations, etcetera...

Take a photoshoot for oscillograms and attach them for further analysis - additional compensation shemtics!!!

Best regards
Dragan

PS:
I will attach your photos in Our forum original teme!
It˙s Ok for you?

Jasno sve sa njegovim odobrenjem postovanja tu:

Yes you can put on the forum the picture for me. I did ask question at the tread but no one reply.


Attached Files Thumbnail(s)

LP
Dragan
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#56
really nice PCB's - good luck with first prototyp and first start!
"Претпоставка је мајка зајеба..." : Д.В. - Дуд
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"Pretpostavka je majka zajeba..." : D.V. - Dude
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