Transistor amplifier as good as electron tube

[adorn751]

Transistor amplifier as good as electron tube.

[adorn751]

I made a small patch in the schema.
This power amplifier is good for the school youth, for the correction to adjust the amplifier has good quality.
In this system, all you need to cool well transistors and use electronic shield-screens and a good installation.

[adorn751]

This scheme is more classic amplifier design.

[adorn751]

Set of amplifiers such as the quality of tube amplifiers.

[adorn751]

Preamps low output resistance ensure extreme quality control for power amplifiers.

[sakis]

ok ...personally i will bother with this for the last time

---Is this a new account ? or you are posting for e friend that speaks no English ?
---Designs that are based on hfe and beta are over dated
---The transistors you continue to use is impossible to get in the world ( except probably in your place )
---450mv input max for any amplifier is not usable by today's conditions ( most sources have 2 volt outputs )
---Having power supply of 17.3+17.3 is not practical and or effective what will happen when the voltage is 18.5+18.5 or even more ?
---Finally since you are working anyway to produce a schematic why not do the same thing with easy to find everywhere existing transistors supply output power ? We are watching as we speak the class D era with thousands of watts what makes you think that one may every construct an amplifier of 2.4W with transistors that can be found nowhere .


Either you or the friend has been told about this before ...your effort like this is getting wasted its is nice to see circuits but having it this way nobody will bother to look any deeper .

So i told you or your friend before .... It could be nice to have answer ...some time ..

[adorn751]

1) I do not know English.
2) Audio transistors were the best and so far no better transistors. Similar transistors need to look.
3) Input voltage low value does not matter, because you can give input resistive divider adjustable.
4) Tensions are precisely determined for the calculation of the system.
5) selection of the type included in the power transistor is not critical, and good to transistors were fast.
6) Domestic amplifiers and such are not required to have high power and, according to the unwritten laws may not have much power for one speaker.
7) My effort is to young to be taught and know what is good and how to make the most expensive audio designs and no matter what are the audio power.

[sakis]

ok ..i am done

[JMFahey]

Dear adorn 751.
The amps you are posting are based on an old, obsolete, Soviet era chip.
Impossible to find here, by the way, and not even there for many years now.
That said, maybe somebody has 1000000 of them (not kidding) stashed in a warehouse somewhere and wants to use them (meaning getting a few Rubles or Zlotys in exchange).
*If* that's the case, I suggest you design and make a proper PCB for the simplest version possible, pack it + 1 IC + an instruction sheet in a small plastic bag and sell them as "beginner's DIY amplifier" or something similar, for a price attractive to a poor student.
Otherwise it's difficult anybody will bother to use them.
Look like knockoffs of early 70's Japanese Radio/Tape Recorder ICs .... which they probably are, by the way

Some sites link it to the once very popular AN214, which does not surprise me.
But today the humble (and cheap) TDA2003 beats it to death.

[Osvaldo de Banfield]

Why so many inductors???? Why coupling capaciancesin the order of 1000µF in the preamplifiers stages???? Too low voltage rise at outputs. And too leaky!