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Old 24th March 2007, 01:33 PM   #511
Nordic is offline Nordic  South Africa
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BOM for PCB in post 503

C2, C4, C7, C8, C11, C13 .1u 5mm film 12
C15, C16, C22, C23 .1u 5/10mm film 8
C17 .1u 15-25mm film 250v 2
C9 12p 5mm film np0/c0g 2
C5 220p 5mm film 2
C10 220u 5mm elco 16v 10mm dia. 2
C18, C19, C20, C21 4700u 10mm elco 50v 30mm dia. 8
C3, C6, C12 47u 5mm elco 50v 10mm dia. 6
C1 4u7 17mm film Width 6mm 2
C14 5p6 5mm film np0/c0g 2

VR1 10k 5mm x 2.5mm trim. top adjust 35V - +-7K7
VR2 100 5mm x 2.5mm trim. top adjust

R22, R23 10 2w 4
R16, R17 33 0.25 4
R15, R18 82 0.25 4
R4, R8 100 0.25 4
R 19 120 0.25 2
R 14 220 0.25 2
R 9 820 0.25 2
R26, R27 10k 2w 4
R 5 1k 0.25 2
R24, R25 1R 1w 4
R2, R6 2k2 0.25 4
R 10 1K8 0.25 35V - 1k8 2
R 12 2k2 1w 2
R 13 2k7 1w 2
R3, R11 39k 0.25 4
R7, R20, R21 4k7 0.25 6

L1 27turns of .6mm enemal wire 2

Q1 2n5401 Alternatives: BC556, BF423, BC556 and BC640*
Q2 2n5401 Alternatives: BC556, BF423, BC556 and BC640*
Q3 TIP41 NPN (VAS) Alternatives: BD139
Q4 TIP41 NPN Alternatives: BD139, MJ340, TIP31
Q5 TIP42 PNP Driver Alternatives: BD140, MJ350, TIP32
Q6 2SC5200 NPN Output
Q7 2SA1943 PNP Output

Z1 1N4742 12V Zener diode 200mW or more
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Old 24th March 2007, 01:41 PM   #512
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Default Now you see why i runned out from those things.

To make it simple and less problematic.

Related all those things... my first preference is to give to the output transistors, heatsink more than enougth...and to help with a fan blower to double guaranteed to drive the amplifier hard.

My second decision is those diodes, because they have more junction to reduce bias under thermical action.

Third is to intall the VBE multiplier into the heatsink..the good place for it as you know Klaas.

The fourth idea, may work fine...BUT...will be awfull that transistor over the other (maybe imoral..ahahaha!)

Maybe a negative coeficient resistance may help, if placed in the VBE base.

You choice the better option to you.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 02:20 PM   #513
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Default To avoid those bias drift, because of the drivers...install


Small heatsinks on them.... as the temperature rise that interest us, to produce action over the VBE multiplier, is the output temperature.

Of course you already perceived that...not too much intelligent decision from me....hehe

Force those guys to be cool!

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 02:40 PM   #514
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Default The "L" shape one is very pretty too.


There's a lot of nice shapes that will match the needs there.

Dinaminc Power there, will not go over 1.5 Watts each driver...so... 1 square inch is enougth to each one of them.

If you decide to use "L" shape or something better, you will be able to reach a heatsink capacity that will be more than double than one suggested by that flat square inch aluminium plate.

" Dx amplifier is Hot "

regards,

Carlos
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File Type: jpg l shape heatsink.jpg (57.3 KB, 746 views)
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 02:58 PM   #515
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Default Good my dear nephew Nordic....thanks


Now Dx amplifier has also a By Nordic list of components.

Dx amplifier is beeing inside minds living in three Continents.

Europe, America and Africa....maybe more when i discover YOU that is thinking on it too.

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 03:07 PM   #516
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Hi Klaas, As Carlos suggests,

Mount the sensor device 'piggyback' on one of the output devices.

Cheers ........... Graham.
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Old 24th March 2007, 03:19 PM   #517
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Default You that is having intentions to construct.


Dx corporation wants you!

" We Want you "


Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 03:23 PM   #518
Nordic is offline Nordic  South Africa
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Hi Carlos, the parts are the ones you mention, in your posts, and schematics, it has a few extra components like the PSU caps etc... but the majority of stuff is directly your circuit and suggestions...for the 35V version.
I just inlcuded lead pitch too to make organising the parts easier...

I cant find 5mm 5p6 cap anywhere online localy... must still check Farnels, I can order from them through a local co... Is that the exact value needed or can slightly larger or smaller value be used if I find one?


Have to read a few more posts to see what transistors you used in then end...
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Old 24th March 2007, 03:30 PM   #519
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Default You can increase this capacitor, that Miller one, till maximum of 27 picofarads,

People say that Silver Mica is more stable...well...sonically i could not perceive that ...as this is very subtle to ear perception.

I am using Ceramics...and you can stole from your FM receiver....hehe...better another board you have as junk.

10 picofarads is very common in radio frequency things, as oscilators and FI transformers.

12, 15, 18, 20 and 22 are easy to find too.

Used capacitors are tested capacitors.. the voltage swing there will be the maximum output voltage swing (less than)...just check if the unit can hold the voltage..having doubts..install from the plus 35 to the negative 35 and wait some seconds..if not hot or not explode...hehe...it is good enougth related voltage tollerance....Silver Mica material is more stable when face variable voltages...and those ones, there, are reasonably big.

In my simulator.... sinusoidal waves started to turn triangle, at 42 Kilohertz, when i have used something alike 47 picofarads...but less than 22 send that waveform distortion to outside our worries limits.

Relax, as i have checked that the amplifier works fine without that Miller capacitor..it is there not to produce too much scandall into people.

That one at the feedback line...hehe..if you remove, the amplifier will oscilate till it's death!

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 24th March 2007, 04:42 PM   #520
kvholio is offline kvholio  Netherlands
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ahh, so the vbe-multiplier is less effective because you have less diode-junctions to counteract the effect of heating up of drivers/outputs.

Sounds to me like complicating the thermal compensation creates problems instead of making behavior better.
I will switch back to the 3 diode-solution and increase heatsinking on the drivers.

Completely off-topic (hope you don't mind), refurbishing a pair of these has kept me occupied the past few days, making progress on the DestroyerX-amp almost zero:
Click the image to open in full size.
Picked them up cheap (tweeters were shot ,had to fit other tweeters)
Considering their age, they sound pretty awesome (look at the datestamp on the woofer):
Click the image to open in full size.

with kind regards,

Klaas
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