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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Regulated power supply for poweramplifier posted by carlmart on November 2, 2001 at 04:42:11:
Hi Carlos
* you wrote "Apparently you should use a power amp as regulator that has an even wider bandwidth than the amp it's powering. You just add a reference (Z1 and Z2 on the A75) from which to build up to your voltage"That is excatly my opinion also. The aksa is band limithed by the poor quality capacitor C4. I work with MKT capacitors in my regulation, so it is faster than the AKSA (all modern transistors have an enormous bandwith, so it are the other components that limit bandwidth)
* you wrote "You did not mention which was the regulator you tested to decide that was the way to go. Or you are just guessing it might be an improvement to regulate it all? "
I will try to describe the regulator I now use because it is a very simple design. Right behind the bridge rectifier (ultra fast-soft recovery diodes) I have 2 elco's of 2200uF in parallell (philips). These are bypassed with an resonably large MKT cap (don't know exact value). From there I make a voltage reference with a precision zener and resistor(to limit current thru zener). This refenece voltage is fed to the base of a fast darlingtontransistor (typ 142 or 147). This darlingtontransistor is in serie of the powersupply line. Behind this transistor I have another buffer consisting of a large MKT capacitor. So with this schematic the voltage is regulated to the voltage of the zener minus 0.7V (base-emmittor tension). It measures quite good and to my ears it also sounds quite good. But I would really like to compare it to more complex regulating circuits.
Hope this is a bit clear, but it is the only way I can describe it.Greetz
Wim
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Follow Ups
- Re: Regulated power supply for poweramplifier - _Wim_ 05:35:24 11/02/01 (0)
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