My invention ? Did I invent this amp ?

[larryB]

I put anybody up to the challenge , this is to prove to a job internship person that I did in fact invent 25%-75% of this amplifier . I do not even study in small electronics , i study industrial electronics (automated aseembly chains , process control , motors etc... ) , but i have a passion for small electronics ( scope in room , love tesla inventions , read/study all the time , etc ... )

I have NEVER seen a circuit that is LIKE mine ANYWHERE ON THE INTERNET , you dont have to be a genius to know that you can used an op amp to drive a mosfet anyways... basicly this idea came to me naturally . The choice of op amps were easy , needed good high volts for the high Vgs drop and fast SR for the high Vgs drop + ok current drive... easy choice .

First off I have never seen somebody used my bias method ,using my school notebook ad my logical deductive ability , I knew that for my purpose adjusting all the 12 bias points would be a serious pain in the neck, the point is to cancel any asymetry in Vgs of mosfets that will not be handpicked or matched , the circuit i based my amp on used coupling cap bias ( not as good for my purpose ) and did not use feedback .

This is a major factor since this is a 3 phase amp and many amps are connected to the single bias point on the + of the op amp . The circuit uses a zener regulator and cap to truely settle the bias point to un-moveable voltage level in case i get noise on the power lines ,this was also my idea , an idea to improve ontop of an idea that I never saw is an idea indeed ?

I put anybody to the challenge to find this specific circuit ON GOOGLE OR ON ANY SITE OR ANY OP AMP BUILT WICH REMOTLY USES THIS DESIGN.

I WILL SEND 5$ PAYPAL TO THIS PERSON .

[kenpeter]

Don't give up inventing just yet, but you got some problems...

Needs custom output transformer with less than .008% distortion.
A tiny DC offset at the input can create several Ampres of lopsided
do-nothing current in the output transformer, possibly saturating the core...

Needs balanced input with perfect even split and less than .008% distortion.
Considering V3 input sees 10K input impedance, and the other input 5K???
10K to virtual ground in parallel with 10K to real ground, yeah that be 5K.
Either get rid the 10K to real ground, or make the same for both inputs...

I don't understand why we need 3 power supplies when one will do.
They make op-amps that work from single supply, you know...

If you can't find prior reference to this circuit, its because you didn't search
the vacuum tube forum. Push pull cathode followers a little strange, but not
unheard of... McIntosh did this, though they put half the winding over the
drain (I mean plate) and used to cancel some parasitics in the transformer
and derive screen voltages that made Pentodes act like today's MOSFETs.

http://drtube.com/audioamp.htm#McIntosh
Look up MC60...

[danielwritesbac]

There are some distant similarities to other amplifiers:

Power amp by Susan Parker
Zero Feedback Impedance Amplifiers

Preamp by Greg van der Sluys
Classic Valve Design - Original and Legacy Design PCB's

However, there are no similarities to amplifiers at the chip amp forum because your design doesn't contain any power-op-amp. Moderator, please move this thread to the discrete solid state amplifier forum.

[abraxalito]

He already posted it there about 7mins before he posted it here. I vote for delete

[larryB]

HANG ON !

I say that we need to let this roll in both , this is for my internship .

and plz post your answers in the other then ...

if this is to be deleted than these 2 answers should be in my single post , my intern guy has to see the posts of people .

[larryB]

Should have made this title . Did I invent this ? And plz give tips to make it better . Cool amp for all to make

thx for all answers , this is free for all to make , plz gives tips on how to make better yes thx ,might still make this one , one day ... one day ...

I gave up making it physically when I saw the price for audio transformers , this was for an invention .

and I thought that I wouldnt saturate the core if the transformer saw approx same current in different directions ... I am confused ?

[kenpeter]

What garauntees the core sees same current both directions? When you have nothing
up front that eliminates DC offset. Especially between inputs of different impedance...
You have nothing that measures DC current imbalance in the winding.

It takes very little DC to saturate an audio transformer.
They have an absurd number of windings. 20 Henries is not unusual...

[larryB]

Ok i modded my drawing , the blue dotted square was making it seem confusing

here is the real drawing with parts of dotted square removed .

Well my idea was that the 99.9% similar op amps on the same chip with Gain 2 would regulate the voltage level at the source of mosfet and that would be enough ?

Remember that is just for showing , this is far from optimized , first off my dc levelis way too high , i see about 2 volts dc with 0.5 ohms resistance , thats = to 4 amps static times 2 , I would drop this voltage to about 0.5 volts , but Im busy doing something else , another circuit .

This sim i made long long ago , 1 year ago in fact .


LETS UPP THE ANTEES : I WILL SEND 10$ PAYPAL TO THE PERSON WHO CAN DISPROVE THAT THI DESIGN IS AT LEAST 50% MINE.

[abraxalito]

Originally Posted by larryB

I say that...

Special pleading.

How about mods merge the two threads over at Solid State?

[wintermute]

I've merged the two threads and left a 1 month re-direct in the chip amps forum and removed the duplicates