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Old 5th May 2012, 10:13 AM   #501
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Quote:
Originally Posted by sonnya View Post

Quote:
Originally Posted by sonnya View Post
Ok, here it is.

The PDF is interactive, so you can click on the parts.

http://sitosite.dk/amps/TSSA-01010512.pdf

http://sitosite.dk/amps/TSSA-01010512-pcb.pdf
No comment or is every one on highend München ????
True, so many good sounding systems on a display, Dan's Momentum impressed me the most (among others).

Sonnya, perfectly laid parts on double layer PCB, will look today and report. Have a nice day.
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Old 5th May 2012, 04:45 PM   #502
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Quote:
Originally Posted by Idefixes View Post
Ok noted will say when i right up and sure will post pcb pictures.

Marc
Today I measured and tested all functional parts of TSSA BIGBT HP schematic separately. Not a single issue detected.

Yes please post PCB images as soon as they'll be ready.

Regards, Andrej
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Old 5th May 2012, 05:01 PM   #503
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Hi LC,

I found today to store the lefting H2O2, just waiting for monday or wensday new laser printer arrival....

Marc
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Old 6th May 2012, 01:38 PM   #504
sonnya is offline sonnya  Denmark
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Tomorrow i will order PCB's and stencil.

The PCB's will be:

TSSA V1.5
Softstart board with <0.5W standby
Powersupply board with space for BHC Aerovox ALC10C153EF63 - They can handle the heat in class A amps. -> 18000hours at 85 degrees Celsius.
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Old 6th May 2012, 01:48 PM   #505
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by sonnya View Post
18000hours at 85 degrees Celsius.
I dont know, but 85degr caps may be gone soon
might be wise to make room for 105 degr caps

besides, I dont find BHC caps very often
mostly Rifa, B&C(Philips), or Panasonic
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Old 6th May 2012, 02:48 PM   #506
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Quote:
Originally Posted by tinitus View Post
but 85degr caps may be gone soon
You try to find large lytics that do 4500 hrs at 105C.

Various alternatives of 15000uF/63V caps in 40x50, 4-pin size.
Panasonic T-HA, 3000hrs/105C, is 12000hrs at 85C.
(e.g. a Panasonic T-UP in that size only does 3000 at 85C)

The BHC ALC10 would last 200K hrs at 50C or 400.000 at 40C !
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Old 6th May 2012, 02:53 PM   #507
AndrewT is offline AndrewT  Scotland
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Is the maximum life specified, only for when Ta = limit AND Iripple = limit?

I seem to think/remeber that both conditions must coexist to reduce the life to the specified value.
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Old 6th May 2012, 07:56 PM   #508
sonnya is offline sonnya  Denmark
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It is a combination.

ESR x Iripple will generate heat and lower the lifetime also.

So lower ESR and ESL will mean less heat generated.
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Old 6th May 2012, 10:38 PM   #509
sonnya is offline sonnya  Denmark
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Oh i forgot. The ESL is not an issue at <1KHz.

If you look at graph for capacitors with Z (impedance) on the Y axis and Frequency on the X axis the impedance is a combination of Xc+Xl(series inductance)+ESR. The curve as a form as a valley at low frequencies the Xc dominates. At the bottom it is the ESR value. When it starts rising again it is the Xl value.

If the load is switching at lets say 500KHz with an ripple of 2Amp peak peak most aluminium capacitors starts to heat up. Tantal capacitors has a much higher resonance frequency (bottom of the valley).

I have had a aluminium cap in a SSA amp exploding because of oscillations in the amp.

The best parts for bypassing is ceramics as there resonance frequency is 10 - 100 times higher.

Best choice for bypassing op amps and digital circuits (or just fast circuits in general) is X5R, X7R, NP0, C0G.

NP0 and C0G has similar parameters. X5R and X7R is for high capacitance values.

Y5V is a NO GO!!! tolerance is -80% to +20%!!!!!!!!!!!!!!

NP0 and C0G can outperform film capacitors in sizes of 10nF and down.

If is would choose a miller cap i would take something like MICA, polyprop, NP0/C0G and compare them for there audible performance. But it is most likely that the MICA and NP0/C0G will be the parts that make the amp stable as there resonance frequency is much higher.

There is no magic to it, just interpreted the datasheet. If a parameter is missing it is mostly not as good as it should be.

elna audio caps has Lifetime of below 2000hours at 85 degrees celcius. That is not good enough in a hot amp. Nor does they say anything about ESR or ESL value.
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Old 7th May 2012, 05:46 AM   #510
Jay is offline Jay  Indonesia
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Default What is your favorite input transistor?

Have you tried various transistor for the input stage? How do you choose your transistor? I found that in TSSA this transistor matters a lot. Usually I still can use my standard 2N5401 for prototyping but here it is not possible at all. Yes, low noise transistors work better but I was surprised that the difference is so big. Attached is a simulated comparison between BC557C/547C and 2N5401/5551. Actually the 2N5401 doesn't work at all even with 0.1V input while BC557 can give THD of 0.002% at 60W output
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File Type: gif SSA2_IRF632_v3.GIF (35.8 KB, 522 views)
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