Hi to Everyone ! at the cost of sounding tedious i would like to understand more about why darlingtons are so neglected in audio power amps
apart from a few small-scale British designers it is almost impossible to find integrateds or power amplifiers that use darlingtons as output devices
If nothing else they allow you to skip a driver stage, right? thus simplifying the project as a whole
From a completely ignorant point of view they should be a godsend for lovers of minimalism
Not only that I know at least one medium power amp that uses darlington and it sounds pretty good, definitely good actually
These are the Albarry m408 monos which at least in my country Italy had become quite famous after a highly rated reviewer had praised them
Why does everyone avoid them? do they stink maybe? 😵
😉
apart from a few small-scale British designers it is almost impossible to find integrateds or power amplifiers that use darlingtons as output devices
If nothing else they allow you to skip a driver stage, right? thus simplifying the project as a whole
From a completely ignorant point of view they should be a godsend for lovers of minimalism
Not only that I know at least one medium power amp that uses darlington and it sounds pretty good, definitely good actually
These are the Albarry m408 monos which at least in my country Italy had become quite famous after a highly rated reviewer had praised them
Why does everyone avoid them? do they stink maybe? 😵
😉
Bebo Moroni? His reviews should have be taken with a grain of salt as many of the stuff he reviewed seemed to be like the holy grail of audio.
Darlingtons are often slower than a carefully chosen discrete pair of transistors but they certainly have their uses in circuit design. LTspice has some included (once you figure out how to use them 😉)
Hi ! yes ! he was him Nevertheless people who have been exposed to the amps in question had all a very positive impression They are mono
It is using a darlington output pair but also a very big power supply built with a 300VA transformer (20VAC-0-20VAC)
A lot for a 40W/8 ohm amp
Hi thanks a lot for the very valuable information I read somewhere that the main issue with the SAP15N could be the embedded power resistor
For sure the more embedded things are the easier the design comes out (just think of power packs) But could it be that the resistor heats the chip up ?
Instead usual darlingtons do not have that power resistor inside If i am not wrong
For sure the more embedded things are the easier the design comes out (just think of power packs) But could it be that the resistor heats the chip up ?
Instead usual darlingtons do not have that power resistor inside If i am not wrong
Even nelson pass once used darlingtons, so I suppose it's ok to say there is absolutely nothing wrong with them!
https://www.diyaudio.com/community/threads/ab100-class-ab-power-amplifier.227503/
https://www.diyaudio.com/community/threads/ab100-class-ab-power-amplifier.227503/
Sanken STD03 had no 0,22R embedded emitter resistor, all are obsolete afaik.
https://www.stereophile.com/integratedamps/780/index.html
Commercial version of NP Darlington amplifier (AB100 DIY)
Commercial version of NP Darlington amplifier (AB100 DIY)
Apart from biasing, thermal drift, double Vbe loss and charge storage troubles they are fine. One should look at the discrete Sziklai/CFP pair.
https://en.wikipedia.org/wiki/Sziklai_pair
https://en.wikipedia.org/wiki/Sziklai_pair
I am sure he would not have published this amp if it was a mistake.
after all he had plenty of time to think over it:
my comment wasn't to be taken that seriously, by the way ... 😊
If everything was easy, we would be bored🙂🙂.
''The Pass A-40 Power Amplifier'':
https://www.passdiy.com/project/amplifiers/the-pass-a-40-power-amplifier
https://www.passdiy.com/project/amplifiers/a40-part-substitutions
If someone had a problem with A-40... to raise his hand and swear to tell the truth🙂🙂🙂🙂🙂.
hi thank you for the very valuable advice Still if i am not wrong at the output of common amps i see a bjt driver driving an output bjt of the same gender
i.e. like in a darlington
If they develop more heat they can be designed to dissipate it
I think that in some cases the idea of putting together on the same chip more similar parts is very nice Like in the Sanken multiple power bjts I love them
Here where i live they are called savonette
The only issues with Darlingtons are that the integrated versions (both transistors
in the same package) have greater thermal drift (because the driver transistors shares
the heat) and the inability to independently set the bias current of the driver.
in the same package) have greater thermal drift (because the driver transistors shares
the heat) and the inability to independently set the bias current of the driver.
Hi dear Mr Pass thank you so much for your kind and very precious advice
so in the end there are reasons for their not so great popularity I am sure and understand that any designer likes to have free hands in designing his/her creations
Heat is also a problem Maybe embedding more parts on a same chip can work when the parts are identical like in some Sanken power devices ?
and they are quite more popular actually
so in the end there are reasons for their not so great popularity I am sure and understand that any designer likes to have free hands in designing his/her creations
Heat is also a problem Maybe embedding more parts on a same chip can work when the parts are identical like in some Sanken power devices ?
and they are quite more popular actually
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Another reason I was never a fan of integrated darlingtons was that (at least back in the day) their data sheets were often a bit sparse for data that you might want to consider for audio application decisions. fT and hFE flatness vs current come to mind as a couple of examples of missing info - I had a college instructor once show a massive frequency response difference between similarly biased emitter followers built with incompletely specified integrated darlingtons vs darlingtons composed of discrete parts that were more thoroughly characterized. He was trying to make the point that what's not spec'd can bite your a$$ if you don't pay attention.