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Old 21st November 2009, 02:07 PM   #11
Pano is offline Pano  United States
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Quite a beast! Seems to do what you wanted. =) I like the part about injecting noise into power lines. That would be very handy.

As good as it is on difficult loads, wonder how it would do driving electrostatic panels? Should do well.
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Old 21st November 2009, 04:34 PM   #12
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by panomaniac View Post
As good as it is on difficult loads, wonder how it would do driving electrostatic panels? Should do well.
It should do well, but in this version, a transformer would still be necessary.
But it would also be possible to "unfold" the cascode, in order to use only high voltage/N devices in the driver and output stages. This should make a direct drive possible.
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Old 21st November 2009, 07:01 PM   #13
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Thumbs up I like it

I have been looking round the net for designs that use all N channel mosfets & i have to say that this must be one of the most innovative that i have seen

I just love the way it can swing nearly rail to rail by the simple addition of a capacitor (2.2uf), as you know you'd normally need a higher supply voltage on the positive side.

I take my hat off to you Elvee Mr.gif

Any idea on the damping factor? I should imagine it should be pretty high or certainly could be made to be so. With no output inductor it should it should be fairly high to high frequencies to.

Very interesting, you have gotten me thinking
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Old 21st November 2009, 08:21 PM   #14
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by event horizon View Post

I just love the way it can swing nearly rail to rail by the simple addition of a capacitor (2.2uf), as you know you'd normally need a higher supply voltage on the positive side.
Congratulations, event horizon, you were smart enough to catch the main innovation of the design!


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Any idea on the damping factor? I should imagine it should be pretty high or certainly could be made to be so. With no output inductor it should it should be fairly high to high frequencies to.
This version has an output impedance of ~100millohm.
At relatively low frequencies at least; at higher frequencies, you can have an idea of the behaviour by looking at the load-dumping and low-impedance tests.
But as you rightly conjecture, it is indeed possible to improve this factor, and I will also describe a more elaborate version doing about 20dB better on this point.
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Old 23rd November 2009, 03:53 PM   #15
Elvee is offline Elvee  Belgium
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Next variant is equipped with an auto-bias servo circuit.
This inclusion is easy and natural, thanks to the already present threshold shifter.
Most of the circuit and characteristics remain unchanged, one of the source resistors can be eliminated.
Iq is set by the ratio of R18 to R19.
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Old 23rd November 2009, 04:21 PM   #16
kevinkr is offline kevinkr  United States
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This is a very interesting design, and I really liked the picture of the glowing screw sitting... umm, err, sitting a couple of cm above a very flammable carpet.. Could have been quite exciting Ought to exercise a little more caution...

Could you please post a full size schematic from the sym as the ones presented do not render properly on any of several PCs I have access to. (Windows & Linux)

I'm thinking this design would be near ideal for use as the PA in an active AC line conditioner/source using a toroid as a step up transformer. Target power would be a couple of hundred watts at 60Hz.. The fact that this thing appears to be indestructible makes it ideal for driving all manner of loads reflected back through the output transformer.

You might want to consider offering a PCB for this design as I suspect (naively hope) that there would be some interest here?
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Last edited by kevinkr; 23rd November 2009 at 04:23 PM.
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Old 23rd November 2009, 05:22 PM   #17
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by kevinkr View Post
This is a very interesting design, and I really liked the picture of the glowing screw sitting... umm, err, sitting a couple of cm above a very flammable carpet.. Could have been quite exciting Ought to exercise a little more caution...
Don't worry: it's a melamine coated MDF board. No risk.

Quote:
Could you please post a full size schematic from the sym as the ones presented do not render properly on any of several PCs I have access to. (Windows & Linux)
I'll try.
Quote:
I'm thinking this design would be near ideal for use as the PA in an active AC line conditioner/source using a toroid as a step up transformer. Target power would be a couple of hundred watts at 60Hz.. The fact that this thing appears to be indestructible makes it ideal for driving all manner of loads reflected back through the output transformer.
A word of caution: robust is not synonymous with indestructible, and if you grossly exceed the dissipation or SOA limits of the output devices, you will fry them (it happened to me).
But it is true that this amplifier is capable of driving loads that nobody in his right mind would dare putting even close to the output terminals of a "normal" amplifier. And it drives them with insane signals, at high power and high frequency.
Also note that the input current is large, and the input impedance is low, compared to a regular audio amplifier. In 50 ohm systems, this is no problem.
And for 200W, you'd need to parallel a number of devices.

I will also describe a number of variants, including one with a special protection circuit

Quote:
You might want to consider offering a PCB for this design as I suspect (naively hope) that there would be some interest here?
Sorry, I don't do PCBs
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File Type: gif CircloAB2full.gif (28.2 KB, 996 views)
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Old 3rd December 2009, 07:53 AM   #18
Elvee is offline Elvee  Belgium
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Default Lower distortion

The next variant has a higher loop gain.
This results in a higher feedback factor, and a reduced distortion: the linearity is now around 5 ppm at near-full power (0.0005% dist.)
Other characteristics remain practically unchanged.


Click the image to open in full size.
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Old 3rd December 2009, 08:12 PM   #19
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Very impressive work, Elvee, thank you! Can you do something with 50V rails?

Hugh
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Old 4th December 2009, 06:58 AM   #20
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Default a bit of ....off topic

is there anyone that can answer me a question regarding induction heating as seen in the example of the OP ????? please ????


the question is:
if a circuit like that consuming so litle power can make a screw actually glow why is there no one so far designed some device that has 4-5 similar coils and 4-5 similar screw or other metal parts, that your home water supply runs through this device cold at the input and boiling hot at the output ?????

i have seen various applications on the internet but nothing like that ...

is there any darwbacks ???? or something i ve missed ???
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