Super Sanken Final Stage "Tauro"

[Stee]

Hi
my last project is an hybrid with 2SA1215 and 2SC2922
drived from a copule of comlementary hexfets IRFP240/9240
(after evaluation will be IRFD110 & C)

the output is with big capacitors (20.000uF) just to leave DC
(this balanced solution don't create emphasys on music)

in this particular design i have put two bipolar devices instead
single one (in AB bias) because need Class A sound without bridge

there is an "auto-biasing" between a copule of complementary
transistor in this configuration, so need just a resistor base to base

 

[darkfenriz]

I don't understand the schematic, is that really working circuit?

 

[padamiecki]

Hi
my last project is an hybrid with 2SA1215 and 2SC2922
drived from a copule of comlementary hexfets IRFP240/9240
(after evaluation will be IRFD110 & C)

Hi,
I can guess how it works
but could you send exact schematic?

 

[Stee]

Tripolar PNPN configuration

I don't know if works
is a project until this WE

this double bipolar ( renamed Tripolar ) is a PNP+NPN
with common collector

so is like a self-biasing device
that works (may be) in phase
as a variable resistor ( signal modulate value )

input satage with common source
split phase in two opposite rail
without feedback and mirror

Regards

 

[east electronics]

i am interested too

more details please .....

looks so simple ....very symetric ...i like that how much power ????? how stable ????

 

[darkfenriz]

So you are trying to foce transistors both the same collector current and base current. I don't think it is workable, you'd need identical beta...

 

[Stee]

Tripolar device

this have seen on QUAD RIAA amplifier
just one pair with capacitors output...

may be works
when I find drawing can attach for you

see soon

 

[Eva]

This looks like a power logic gate

Bear in mind that every transistor has unique parameters, which are temperature dependent too. Some kind of feedback is requited to keep biasing stable on all stages.

 

[Stee]

suorce schematic

http://www.dc-daylight.ltd.uk/Valve-Audio-Interest/Schematics/QUAD-34-MC-Disc-input-mods.PDF

 

[Giaime]

Notice that in the schematic you linked in your last post there is no capacitor in series with bjt's bases, so no need for identical beta. Compare this with your circuit...

 

[Eva]

Stee, you would perform really great in sales and business because you have even found an attractive name and an interesting way to show us something that has little chances of working

 

[Stee]

may be works

thanks Eva

i have apply the same method in my loudspeakers
named push-push
same complementary copule working in-Phase
and pump so good...

plus an attractive logo now:

http://www.esafono.it/tauroamp.jpg

 

[darkfenriz]

Great logo!
It's high time for a group buy

seriously
save yourself time and fatigue, it won't work

 

[Stee]

seriously save yourself

thanks
in any forum there is someone that say however the same

 

[poynton]

I still don't see how it works.

The circuit in the QUAD preamp module looks similar at first glance but differs from your final circuit.

Let's see a final working version of yours, please.

Photos.


Andy

 

[poynton]

Re: seriously save yourself

Great logo!
It's high time for a group buy

seriously
save yourself time and fatigue, it won't work

thanks
in any forum there is someone that say however the same

Have you floated this idea on other forums??

Andy



EDIT : My apologies to the language purists. I know the plural of 'forum' is 'fora' but many do not.

 

[padamiecki]

strange
but it works!
output stage has high THD with high order harmonics
but it works...

 

[poynton]

I still maintain that the "Quad" circuit given as an example actually bears no resemblance to your circuit.

Please explain why you think they are similar.



And

 

[CBS240]

The collectors of the outputs have no reference. AC input would cause the top transitor to turn off as the bottom one turns on, and vise versa. This circuit makes no sense. I wonder if you are confusing this with a cascode output stage, like this.

 

[Stee]

Please explain why you think they are similar.

see this sample
is not a cascode

input signal made two waves in phase
the output is a mix of this two in load resistor
trought capacitors

Regards