Forgive me, not strictly related, but relevant:
NEW DESIGN BRIEF: POWER FOLLOWER
Single Ended Push Pull
Bipolar power supply
No Global Negative Feedback (local is permitted)
40W rms into 8R
Sliding Bias
Global negative feedback
Reliable offset control
Any takers? I'm sure it can be done, has been done by Taylor and various others. Can anyone have a go at this one?
Such an amplifier promises:
1. Efficiency around 40%
2. H2/H3 only - no higher order harmonic distortion
3. The challenge of low output impedance
4. Unconditional stability into any load
5. Tube front end?
Cheers,
Hugh
NEW DESIGN BRIEF: POWER FOLLOWER
Single Ended Push Pull
Bipolar power supply
No Global Negative Feedback (local is permitted)
40W rms into 8R
Sliding Bias
Global negative feedback
Reliable offset control
Any takers? I'm sure it can be done, has been done by Taylor and various others. Can anyone have a go at this one?
Such an amplifier promises:
1. Efficiency around 40%
2. H2/H3 only - no higher order harmonic distortion
3. The challenge of low output impedance
4. Unconditional stability into any load
5. Tube front end?
Cheers,
Hugh
Yes, I know that.. 🙄 And I know that if I use the IMG button to point at an image on my server, it works.fdegrove said:
This was something different; I pointed an IMG command at an image that resides on diyAudio's server.
Oh, and I've seen enough diodes too....Off to the bathroom...
John, if this is the new way to build Zens, i will write a mail to arrow, they should send me some hundred zehner diodes as free samples.... can i use a power transformer for this?
The above schematic with many protection zener diodes is more than necessary to protect the output device. A simple zener between the gate and the source, and R1 would be OK in a real circuit. Without them, problems could develop, and a commercial design would probably include these extra parts.
John, I think it was being a bit tongue-in-cheek.
In any case, how would you characterize the difference between the requirements of diy circuits and production-ready circuits?
In any case, how would you characterize the difference between the requirements of diy circuits and production-ready circuits?
SY said:
Hehehe.
Tongue-in-cheek aside, how should we rule on power MOSFETs? Can we truly consider them a single transistor? They may behave as if they were, but then so would any number of them in parallel. As well as multiple transistor configurations such as Darlington and Sziklai pairs, triples, etc.
So would a follower made up from a Darlington or Sziklai pair be considered a one transistor design? If not, why not if a power MOSFET is to be considered one transistor?
se
E pluribus unum
Three possibilities in order of descending propinquity:
1. All on one chip
2. All in one case
3. All on one board
Three possibilities in order of descending propinquity:
1. All on one chip
2. All in one case
3. All on one board
Hi,
As they are considered as such by the majority of people, why not?
Match them between channels and that's it, I reckon?
No need to disect everything to absurd hairsplitting levels.
Cheers,😉
As they are considered as such by the majority of people, why not?
Match them between channels and that's it, I reckon?
No need to disect everything to absurd hairsplitting levels.
Cheers,😉
No need, sure, but it's fun on the same level as decreeing that a power amp needs to be designed using one and only one transistor. It's an interesting gedankenexperiment.
Hi,
Sure...question is where does it begin...where does it end?
I doubt that people in the tube world would view a number of pararalled triodes/penthodes the same way, yet since a mos-fet is basically the same thing sitting on a single dye and since it is manufactured as such, I feel it is perceived as a single device by most people.
From a purist POV of course the humble FET lacks gestallt...😉
Sure...question is where does it begin...where does it end?
I doubt that people in the tube world would view a number of pararalled triodes/penthodes the same way, yet since a mos-fet is basically the same thing sitting on a single dye and since it is manufactured as such, I feel it is perceived as a single device by most people.
From a purist POV of course the humble FET lacks gestallt...😉
SY said:
Exactly. I mean, this thread started out with the following seven words:
Ladies and gentlemen, I have dream...
Er, ok. Six words. Damned foreigners. 🙂
So if you truly want one active device, we're limited to bipolar, JFET and single cell MOSFETs (if there are any descrete MOSFETs which are single cell) and vacuum tube triodes. JFETs and single cell MOSFETs won't work because they can't handle the power. So I guess that seems to leave us with BJTs and triodes.
se
fdegrove said:
When you've actually got one active device.
Just as such things as opamps and Darlington transistors are perceived as a single device. So if you want one active device per channel, just build a Gainclone. 🙂
What it lacks is cojones, alas.
se
Well, interesting, if I buy two transistors and hook them up as a Darlington, is that somehow different than getting the Darlington in a single case? Doesn't matter, I suppose, this whole topic is just a fun exercise.
Remember. Fun.
SY said:
Yes. It's an issue of semantics. Do you want one device? Or do you want ONE device?
But the real challenge is to actually use just one active device per channel.
Hey, I'm smilin'. See? 😀
se
Hi,
Just a little gedankenexperiment of my own delving deep into the psyche of a poor human under constant heat and humidity stress...
I'll give this much, the xformer coupled idea would work straight out of the box with alot of tubes...with Mossies it's a tad more complicated...
So if you want to come full circle, what you're left with is tubes.
Thank me later for presenting an elegant escape route...
Keep on spinning the wheels guys,😉
Just a little gedankenexperiment of my own delving deep into the psyche of a poor human under constant heat and humidity stress...
I'll give this much, the xformer coupled idea would work straight out of the box with alot of tubes...with Mossies it's a tad more complicated...
So if you want to come full circle, what you're left with is tubes.
Thank me later for presenting an elegant escape route...
Keep on spinning the wheels guys,😉
fdegrove said:
Not necessarily. That's why the semantics issue needs to be addressed. If a single device can be multiple devices built on the same substrate, then the transformer would work just fine with a Darlington transistor.
Otherwise, the transformer wouldn't work very well at all with any viable true single device like a single triode or single bipolar.
se
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