eine fantastische Verstärker/Endstufe

[Stee]

http://www.esafono.it/NTC.jpg
see this project with NTC thermal sensor
Ciao!

 

[jaycee]

Hmm
I dont see the point of the opamp buffer.
The output stage looks funny.
Only 2 pair of MJW21193/4 at 75V?

 

[Stee]

Buffer is an optional

May be need another pair of paralleled final devices
if you need to use at maximum POWER

 

[syn08]

Stop this nonsense.

 

[ostripper]

Stop this nonsense.

I agree , this looks outright deadly.
I would not hook my other 1500VA to it , spray the room with molten copper and kill the kids...

 

[peranders]

It looks like an Elektor design. It's a more or less conventional amp with a power stage without feedback. Is that good?

 

[Wavebourn]

Definitely, character of distortions on speaker's output will be different.

 

[Juergen Knoop]

me recognised the elektor odor too.
Anyway, is there any hint, that those circuit is genuine and not 'improved' by dear Stee?
Regards

 

[KSTR]

Look close, and you see the troll's pimping!

 

[peranders]

Just checked the website esafono.it could be done by our halojoy. What is the message of the website?

 

[Giaime]

He likes to do circuit analysis with Photoshop.

 

[KSTR]

Just checked the website esafono.it could be done by our halojoy. What is the message of the website?

Just ask him: http://www.esafono.it/NewSito/Contatti.html

(er, never mind)

EDIT: and if this the same guy (it looks lile)... he has a patent application which looks "interesting" too, go pat2pdf.org, 20060093156

 

[Mr Evil]

I looked at the circuit starting from the left, but only got as far as C1 before seeing that the circuit will not work. With no path for the input bias current for the op-amp, it will not give a valid output.

 

[Lumba Ogir]

Hi,

eine fantastische Verstärker/Endstufe

An overwhelmingly large number of signs indicate the opposite.

It's a more or less conventional amp with a power stage without feedback

With feedback.

 

[Stee]

see the original one

http://www.esafono.it/pre50Vbis.pdf
Note: the sensitivity of the CFP is very high

my patent works very well with the speakers Ciare CW171
(with open magnetic circuit)

Important: the CFP Output Stage have the same drivers as final devices
to compense "hide Gain" and balance PNP-NPN hFE difference

 

[JonasKarud]

?????????????

http://www.esafono.it/pre50Vbis.pdf

Very nice 1000 ohm resistor in series with output.......

 

[Stee]

thanks JonasKarud

I have made a correction
see easy version here
http://www.esafono.it/pre50V.pdf

 

[JonasKarud]

?????

http://www.esafono.it/pre50Vbis.pdf


You cant have a 47 ohm resistor in series with a poweramp output! The amp output must at least have 20 times lower impedance than the driven load.

What is this amp intended to drive?

 

[Stee]

sorry

don't understand
do you means 18 ohm in series to each driver?

remeber
CFP have gain G=1
also is able to found zero by it's self
don't need NFB

probabaly need a paralleling of 3pair of final for maximum power@8ohm
Motorola 21193/21194 transistors have a good SOA

 

[stinius]

.it could be done by our halojoy.

AKA lineup

BTW, reading the posts by stee makes me wonder, is it possible to be so stupid or is it somebody joking?