Simple Symetrical Amplifier

[Lazy Cat]

Originally Posted by destroyer X

I found it a little bit strange.... my simulation show it becomes very unstable

Something is wrong with your sim model or so, because in practice tests I couldn't make it oscilate in any load circumstances. Very stable design, only we have to lower THD a little bit.

[destroyer X]

And Hugh have appreciated.... this means a lot for me...if he likes...then it is good.

regards,

Carlos

[Nico Ras]

Using two series connected diodes instead offers best results. I used 1N4004. Lazy Cat, you want to actually make an IGBT? In my humble opinion, I don't think that making it that complex is worth the effort. You have a good amp here it will satisfy most.

Calos, I think there may be a problem in your diagram. I have not checked the re-captured diagram but I work from Lazy Cat's pencil drawing, re-capturing schematics easily produce errors. This amp overdrives cleanly and symmetrically, I cannot find any fault with Lazy Cats design besides it not using 100 transistors and does not have fractions of a percent distortion.

One must keep in mind, harmonic distortion is not the be-all and end-all of amplifiers. The fact that there is almost zero phase shift over the entire audio band, in fact way up to 100 kHz will make this amp sound pretty realistic regardless of the relatively high odd order artifacts which only alters the character to the extent of maybe sounding a little clinical.

Unless you are a person with perfect pitch (only a small fraction of the world population has) you will find little to complain about. I have not built it yet (and intend to in the next few days) but I can read the merits of well engineered stable amplifier regardless of simplicity.

I think this is a relatively inexpensive amp that will satisfy the tastes of many listeners, a perfect group-build project and I am not shy to say I support this design wholeheartedly. For many it may just be "The Best Amplifier They Ever Heard" regardles of a few very minor short comings.

Nico

[Lazy Cat]

Originally Posted by Nico Ras

Lazy Cat, you want to actually make an IGBT? In my humble opinion, I don't think that making it that complex is worth the effort. You have a good amp here it will satisfy most.

IGBT's from Toshiba GT20D101/201 are non complex change if they would make a justified improvement.

[Lazy Cat]

Originally Posted by Nico Ras

I think this is a relatively inexpensive amp that will satisfy the tastes of many listeners, a perfect group-build project and I am not shy to say I support this design wholeheartedly. For many it may just be "The Best Amplifier They Ever Heard" regardles of a few very minor short comings.

Nico

Yes, I agree and will do my best to bring it there.

[destroyer X]

because i love people to build my amplifiers... so, i use ideas from others too as i have not born knowing audio electronics..i have learned from others...i do think everybody is this way.

I do have noticed that people trust in THD...when levels are high they do not have interest to build our stuff.... so...i am always searching for circuits and interesting ideas but they must present nice numbers...as i will use this as a lever to produce advertisement and some guys will build my stuff.

My personnal beliefs that distortion does not matter is something people does not accept, or distrust, or prefere to build something that is published with a lot of zeroes in the left...these 0.0009 % THD or even less...they think this is good....so.... they trust...and this is what i need..their confidence to try my amplifiers.

They are other guy's ideas tuned (my amplifiers)....as i have not invented Class A , Class AB, or invented amplifiers nor transistors.... all i know was Klipsch, Self, Slone, Sinclair, Brice, Duncan ,Singmin, Davis, Patronis, Watkinson, Hugh Dean, Karris, Cordell, Pass and many others that helped me a lot and are sources of important information.

So...if distortion is higher than 0.009 % THD... then do not interest me anymore...as i will not succeed to tune it to my own ideas about sonics and to offer it built, tested and tuned..dedicated to DIY community, for them to build... i do think they will not be interested.

I will look forward to see this amplifier progress....maybe i will build to listen it in the future... if not too much complicated.

Carlos

[lineup]

Simplicity is the final achievement.
After one has played a vast quantity of notes
and more notes,
it is simplicity that emerges as the crowning reward of art.
/ Fredrik Chopin

[dadod]

Everything should be made as simple as possible, but not simpler. ~Albert Einstein

[destroyer X]

Dice is Dado in my language.

This amplifier looks intersting.

C'a marche!

Carlos

[dadod]

Originally Posted by destroyer X

Dice is Dado in my language.

This amplifier looks intersting.

C'a marche!

Carlos

The same in Italian.
I my country it is a nickname.
dado