After im using the red-led's for biasing I noticed preamp is much faster and sound is cleaner.
stormsonic,
noise is not the biggest problem, what's worse is that the TL431 is an IC. For 36 Vref, however, you need 20 red LEDs; a substantial rise in noise and dynamic impedance.
noise is not the biggest problem, what's worse is that the TL431 is an IC. For 36 Vref, however, you need 20 red LEDs; a substantial rise in noise and dynamic impedance.
That would be suitable place for using two-bjt-transistors Zener-substitute (which I used for instance for 100V)
I would not fight for very high stabilization factor, the simpler shunt PS solution - the better pulse responce, which is of the top priority here. From this point of view, I consider the popular shunt PS by Salas as a bit misconceptual for audio purpose.
What are you trying to say? Power supply is a complex matter. Shunt regulators are clearly most suitable for audio use. What do you mean by pulse response?
I mean transient processes in the system after some very abrupt changes, in particular, changes of the output load. The transient processes are more complex in a complex systems, and these transient artefacts, even if hardly measurable, usually affects the sound (our hearing is the most sensitive instrument).
And I would not agree, that shunt regs are suitable, I would like to say, they are better and preferable for audio, but more difficult in implementation.
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Most importantly, voltage regulators have to provide an output power that is free from ripple and noise in a wide frequency range, which means low impedance, without harming the signal too much. Pulse response is not an issue here.
The difficulties of implementation of shunt regulators increase with power, while the performance deteriorates. This is a general physical phenomenon.
The difficulties of implementation of shunt regulators increase with power, while the performance deteriorates. This is a general physical phenomenon.
WuYit,
Just curious, what characteristics make the shunt regulator more suitable than a series regulator for audio use.
Thanks
-Antonio
Good question.
I hope somebody will explain using simple words the difference. between shunt reg. and series reg. for audio. And what is better to use.
About advantages of shunt PS, one could think this way:
- with series reg, an abrupt jump in load conditions cause current jumps along all power feeding chain, including trafo, power cord, house switchboard etc., giving ground for gold plated power jacks etc.
- with shunt reg, in the same situation, changes happen only locally, between the schematics and regulated element of shunt PS. No extensive electro-magnetic field distortions, etc.
- with series reg, an abrupt jump in load conditions cause current jumps along all power feeding chain, including trafo, power cord, house switchboard etc., giving ground for gold plated power jacks etc.
- with shunt reg, in the same situation, changes happen only locally, between the schematics and regulated element of shunt PS. No extensive electro-magnetic field distortions, etc.
Ripple suppression is not a problem, simplest virtual battery and its done. All difficulties start from the need in good pulse responce, i.e. "ripple eater" must be extremely fast, and simplest parametric shunt reg with a Zener or LEDs provides possibly best pulse responce.
magnoman,
let me just say: small intrinsic impedance, the most fundamental property of any voltage source.
For instance, the nominal dynamic impedance of TL431 is 0.15 Ohms up to 100 kHz.
let me just say: small intrinsic impedance, the most fundamental property of any voltage source.
For instance, the nominal dynamic impedance of TL431 is 0.15 Ohms up to 100 kHz.
I thinks this type of shunt is both simple and good...Thanks Vlad...
http://www.diyaudio.com/forums/atta...d1294380793-50w-version-zen9-903-_-926-_-.jpg
I think I'll make a dual rail version to run my "normal" topology amplifier front-end...🙂
http://www.diyaudio.com/forums/atta...d1294380793-50w-version-zen9-903-_-926-_-.jpg
I think I'll make a dual rail version to run my "normal" topology amplifier front-end...🙂
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Honestly i dont understand the circuits in that level to notice differencies of biasing. All I can notice is that You are using Ic and several active devices for biasing. The biasing implemented in Andrea's circuit looks more simply. The advantage there according me is virtual battery circuit.
Anyway, in his confusion about signal route, signal ground and electrolytic capacitors, Ciuffoli came up with a substandard biasing method and power supply, constituting bottlenecks for the Follower-99.
I`m not in love with the TL431, I just must always use an IC for my software to function. You may want to replace the voltage and current sources with different types, but keep in mind that Zener diode is one of the nastiest device you can employ in audio circuits.
I`m not in love with the TL431, I just must always use an IC for my software to function. You may want to replace the voltage and current sources with different types, but keep in mind that Zener diode is one of the nastiest device you can employ in audio circuits.
Vladimirk and all,
Thanks for your insight into the shunt regulator and its constant power load to the main.
Thanks
-Antonio
Thanks for your insight into the shunt regulator and its constant power load to the main.
Thanks
-Antonio
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