A good performer with minimal compensation. The triple emitter follower is usually the defacto standard for fidelity
https://www.pcbway.com/project/shareproject/Pot_luck_amplifier_09c74fc8.html
https://www.pcbway.com/project/shareproject/Pot_luck_amplifier_09c74fc8.html
I wonder why you direct us to a site where you have to register to download the schematic. It is too small to view. So to appreciate your post, I have to follow the link, register to the site before I can see the schematic.
Wouldn't it have been easier if you copied the schematic and posted it here? This feels like a scam.
Wouldn't it have been easier if you copied the schematic and posted it here? This feels like a scam.
On the target site schematic, I clicked "open image in new tab" and got a nice full size schematic...without registration.
HTH, David
HTH, David
That is correct. DavidT did not say to scroll down. If you know that, it is easy.
Maybe copying the image and include it in the post was even easier.
Here you go... from the "help desk". Enlarge at will...
David
David
There is no drastic sound degradation in the 1DIFFEF new with the additional Short circuit and over current protection scheme.
Very high THD figures, what does the "luck" consist of?
10 to the power of zero = 1 (%) - the best of the one you compare with are at 0,3% - isn't that start clipping level THD value?
As usual quite "strange" things coming out here.,.. seems unlucky,,,?
Is a new design showing 0,7% THD @ 1W a showpiece?
Are all charts from simulations - also the commercial designs? If so, there is something wrong with the simulations.
//
10 to the power of zero = 1 (%) - the best of the one you compare with are at 0,3% - isn't that start clipping level THD value?
As usual quite "strange" things coming out here.,.. seems unlucky,,,?
Is a new design showing 0,7% THD @ 1W a showpiece?
Are all charts from simulations - also the commercial designs? If so, there is something wrong with the simulations.
//
There are some respectable names in that lineup and none of them have a THD below 0.1%? Yeah, something is very wrong here!
Nothing wrong here really, the testing methodology tests with something close to real music or audio, however take a listen yourself to some of these equipment at a show room, equipment renting or a collector friend
A triple EF output stage with zobel in the wrong location and inadequate thermal compensation. What could possibly go wrong? 🙂
Just a thought ...
Given the relatively high amount of harmonic distortion that speakers exhibit driven at medium to high level, what would 1% of amp distortion do?
Most speakers can't even accurately reproduce a number of waveforms.
I guess that "LUCK" might come into play if one component's distortion directly subtracted from another component's distortion.
where the driver transistors are kept independently cool ?
There are things I just don't know about.
Given the relatively high amount of harmonic distortion that speakers exhibit driven at medium to high level, what would 1% of amp distortion do?
Most speakers can't even accurately reproduce a number of waveforms.
I guess that "LUCK" might come into play if one component's distortion directly subtracted from another component's distortion.
Could someone elaborate/explain to me how/why "thermal compensation" is relevant to BJT output transistors when large cooling is applied and
where the driver transistors are kept independently cool ?
There are things I just don't know about.
The EF3 (in #9) is probably fine.
The zobel is also fine. The location is correct. The value chosen might be debatable.
For thermal coupling, if you mount the VBE multiplier on the heat sink. It is absolutely fine even with a small heat sink.