Swinik output

[Guest]

[quote author="recnsci"] Wavebourn, thats
one nice output. Not to mention how cute it is to see "vihod" writen on
schematic instead of "output". Two questions: with that diode
below R1 pnp branch will start conducting on smaller output currents
compared to npn branch. What was the reason for that asymetry?
[/quote]

Because I was bored by clarinet-like sound of electronic organs and liked all asymmetrical. I still like. :grin:

However, that diode did not make a weather like asymmetrically loaded opamp, but anyway I felt better. :grin:

And, why bootstrapping instead of CCS (
especially if that's +-48 unregulated) ?

Because it was 1976 or 1977...


Here is the later version, 3-step approximation (BJTs work up to 3A Hitachi pair, FETS for the rest evaporizing binding posts and screwdriver tips)
However, it would be more effective to power the driver stage from about 5V more than output transistors, but while it looks berrer on specs it does not add much audible loudness.

Why Swinik?
Because it was build in the box from old oscilloscope with rounded corners so a round hole from the tube I used as a cooling fan hole looked like a pig's nose so guys called it Swinik, it means something like "Piggy".

 

[recnsci]

What I like about that configuration that you call A+C is that during
switch on/off time (and thus dramatic carrier level shifting at junctions)
needed current is provided by fast low impedance driver. In "regular"
opamp topology, current demand is put on something like common
emitter loaded with CCS. And that stage will not be pleased by sudden
demands on current and dramatic variation of whatever impedance is
it driving. My guts are telling me that A+C will outperform any B or AB
type, not to mention vastly simpler biasing (that is, there is
no ******* biasing for output transistors).





[quote author="Wavebourn"]

Because it was 1976 or 1977...

[/quote]

Jezuz, that thing is older than me.

[quote author="Wavebourn"]
Why Swinik?
Because it was build in the box from old oscilloscope with rounded corners so a round hole from the tube I used as a cooling fan hole looked like a pig's nose so guys called it Swinik, it means something like "Piggy".[/quote]

I thought you called it swinik because of raw power.
Like V8 engines in real cars.

cheerz
ypow

 

[Guest]

[quote author="recnsci"] My guts are telling me that A+C will outperform any B or AB
type, not to mention vastly simpler biasing (that is, there is
no ******* biasing for output transistors).

[/quote]

Unfortunately, sneaky Britains patented the trick, though did not get full advantage of it... I was pissed off when discovered that fact. :twisted: However, they patented it before I made my Swinik.

[quote author="Wavebourn"]
Why Swinik?
Because it was build in the box from old oscilloscope with rounded corners so a round hole from the tube I used as a cooling fan hole looked like a pig's nose so guys called it Swinik, it means something like "Piggy".

I thought you called it swinik because of raw power.
Like V8 engines in real cars.

[/quote]

Like in my Nissan Armada.

May be because of the raw power, it was called by guys from our university rock band "Allegro" so I do not know for sure.