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In Reply to: re: a possible double-wave rectifier? posted by Mart on February 07, 2001 at 16:20:52:
Mart, don't tell us about it, quick to the patent office! ;-) The best thing is to try it on a solderless breadboard (available from Radio Shack) Try it with various loading conditions and see if it works as you imagine that it does. Once, in 1962, I reinvented the full wave bridge. My physics professor thought that I was nuts! I was right, but many years too late.
Follow Ups:
I was talking to an Electronic Technician. He said the rectifier impedence reduces in order to draw more current from the wall. I assume he's talking Class AB. Is this true, or is he full of it?
....just my 2¢
» Mart £ «
Planar Asylum
where the speakers are thin but the music is anything but
Mart wrote:I was talking to an Electronic Technician. He said the rectifier impedence reduces in order to draw more current from the wall. I assume he's talking Class AB. Is this true, or is he full of it?
I think what he's really trying to say is that your rectifier diodes will not be conducting at all times since you're still dealing with a pulsed DC waveform out of the rectifier bridges. So much as with a more conventional power supply, the rectifier diodes will only be conducting when the voltage across your reservoir caps is less than the voltage across the rectifier diodes which means that your inductor/capacitor arrangement will alternately see a high impedance when the diodes are off and no current is flowing through them and a low impedance when they turn on and are topping off your reservoir caps.
Whether the amplifier itself is operating in class A or class AB, it will still be drawing down on the reservoir capacitors between cycles just as happens with a conventional supply, only it will want to be topping them off 240 times per second as opposed to 120 times per second.
Why not just go with a choke regulated supply? I don't see why it wouldn't give you the same or better end result you're trying to achieve with this design.
se
At least mine will only be on ½ the time. Asking for a constant voltage from a constant current device bothers me. Other than that Pi-filters are nice. Most Pi-filtered amps sound too far backward for my tastes unless you at least double the capacitance nearest the amp. It's fine on pre amps. But on amps, it sounds like old eauipment with ferrite beeds of the powercords & transformer type power conditioners. I'm trying to advance beyond that.
....just my 2¢
» Mart £ «
Planar Asylum
where the speakers are thin but the music is anything but
Mart wrote:At least mine will only be on ½ the time.
That would be great if you're only listening the other half of the time. :/
Asking for a constant voltage from a constant current device bothers me.
Perhaps it only bothers you because you don't understand how it functions.
In your approach, you're trying to take advantage of the voltage and current relationships in an inductor and a capacitor to improve performance. But that's precisely what a choke input supply does. The choke works in conjunction with the reservoir capacitors to provide a constant voltage with dynamic current capability at the node between the choke and the capacitors.
Other than that Pi-filters are nice.
Why is the inline choke in a pi filter any better than the inline choke in a choke input supply? Or are you referring to pi filters on the AC line rather than the power supply?
I'm trying to advance beyond that.
Great. However I don't see the advantage your design would have over a choke input supply.
se
No one's stopping you. The thing that haunts me is SACD. If we have a superiorly sampled digital format which follows the analog signal path more precisely, then the poorly sampled AC would be exposed. By doubling the sampling rate. The ripple starts from a superior stance. Then, you can over kill the Pi-filter later on.
....just my 2¢
» Mart £ «
Planar Asylum
where the speakers are thin but the music is anything but
nt
you're trying to tell me you can hear whether a pi filter is inserted after the transformer? Explain!-JC
either have the same cap or smaller ones nearest to the amp. The choke then becomes obvious. When this cap is tapped, it can't retreave more current because the choke is retarding any change in current. Thus, the dynamics are mucked. If however, you double the capacitance nearest the amp, all you'll hear is the lack of ripple.
....just my 2¢
» Mart £ «
Planar Asylum
where the speakers are thin but the music is anything but
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