Eiron wrote:

Iain M Churches wrote:
It has no global feedback, but otherwise no details are known, indeed
it's not known if it has physical existence.

It would be difficult to run a series about the design of an amplifier
that doesn't exist:-)


It would seem prudent, therefore, to postpone my making any comments on
either its design or its 'performance', or attempt to compare it with
anything else. :-)


You could follow the KISS thread in RAT so far, and see if you agree with
what Andre has written to date. RAT is a friendly NG with a large number of
very well informed subscribers.

How strict are the negative feedback rules?
I presume a Darlington pair or triple is allowed but if I use a triplet
of NPN/PNP/NPN or even an NPN/PNP pair then someone is going to argue
that it has a load of negative feedback even though it behaves like a
high gain transistor in emitter-follower mode.

There should be some design parameters set before I raid my junk box.
To make it fair for the valvies, perhaps I should only use germanium
transistors. :-)

--
Eiron.

The challenge to use TWO bjts, ie 2, one plus one.
No more than 2. Less than 2 if you like.


Since it is impossible to get Ro down to 1 ohm without some sort of NFB,
we will allow enough to do this and no more.

5 watts output.
1 volt input, at least 50k input Z.

I doubt it can be done with TWO BJTs.

But a mosfet and j-fet will allow it,
so the circuit can be as simple as the triode amp.

Patrick Turner.