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Old 11th February 2013, 08:14 AM   #3931
PauloPT is online now PauloPT  Portugal
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Quote:
www.esperado.fr - Accueil - Alimentation Crescendo
Thank you

I have two questions:

Could the BDY's be replaced by a single more powerfull transistor like SC5200?

What's the role of the TL431 if the zeners are in place?

Thank you again.
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Old 11th February 2013, 09:53 AM   #3932
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Hi paulo.

The precision zeners are there to fine tune the output voltage to match the + and - supply close in value, within millivolts.
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Old 11th February 2013, 11:06 AM   #3933
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which is the schematic of shaan SSA with Servo?

Didiet
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Old 11th February 2013, 02:16 PM   #3934
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Shaan any news on PCB fabrication from your side ?

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Old 11th February 2013, 03:39 PM   #3935
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Quote:
Originally Posted by PauloPT View Post
TCould the BDY's be replaced by a single more powerfull transistor like SC5200?
Of course, but remember you will need, anyway, a soft start if u use big caps.
TL431 is an adjustable Zener, Nor able to go high enough in voltage, thus the need of the other zeners to add their own, that you will chose according your need.
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Old 11th February 2013, 03:55 PM   #3936
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Quote:
Originally Posted by shaan View Post
Hi paulo.

The precision zeners are there to fine tune the output voltage to match the + and - supply close in value, within millivolts.
Hi Shaan, I think you forgot to include on your SSA Impotant Links on how to do the biasing on your SSA amps. I'm for sure it will be helpful to eveyone who is attempting to build it, specially on the first power up of the amp. Just my two cents.

Fred
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Old 11th February 2013, 05:26 PM   #3937
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So, Im fairly to new amp building, have built one amp recently and a few kits many years ago. Im looking for a new project and find this to be a circuit id like to build. It looks like a lot of time and energy has gone into this, and I cant wait to start.
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Old 11th February 2013, 05:50 PM   #3938
PauloPT is online now PauloPT  Portugal
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Quote:
Originally Posted by fredlock View Post
Hi Shaan, I think you forgot to include on your SSA Impotant Links on how to do the biasing on your SSA amps. I'm for sure it will be helpful to eveyone who is attempting to build it, specially on the first power up of the amp. Just my two cents.

Fred
You don't need to bias the amp, the 2 1N4148 set the bias for the fets. You need to ajust the dc offset with the trimpots or use the servo version instead.
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Old 11th February 2013, 05:52 PM   #3939
PauloPT is online now PauloPT  Portugal
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Quote:
Originally Posted by Esperado View Post
Of course, but remember you will need, anyway, a soft start if u use big caps.
TL431 is an adjustable Zener, Nor able to go high enough in voltage, thus the need of the other zeners to add their own, that you will chose according your need.
How much current goes trough the zeners?

How many volts should be across the transistors? (vin-Vout)

thanks
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Old 11th February 2013, 06:18 PM   #3940
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Originally Posted by PauloPT View Post
How much current goes trough the zeners?
How many volts should be across the transistors? (vin-Vout)
I is Set by the 380 Ohm. (V=RI) need ~ 1/100 of the requested output current.

Vin-Vout/Vin is perfect around 7%: More, you need more power dissipation for the power transistor, less, you have less margin when AC flows or high demand. Tune-it to let a little margin when full power with the amp on its charge.
If it is too complicated, just change the Zener total values to let 25/30V in the TL431, according to your V.
It is the simplest stabilization you can find, so simple that i think it need no further out of topic explanations.
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