EveryCircuit - New newer than new transistor amplifier

kiani

7 years ago

Does this biasing technique run into thermal run away issues?!

hurz

7 years ago

No

kiani

7 years ago

Then why the H biasing?!! the changes in Vbe, isn' t going to shift the biasing all over place.?!!

hurz

7 years ago

No

kiani

7 years ago

Then why is the H so popular in use?! Btw. Think politicians have something to learn from you @Hurz. ( as they neve say "yes" or " No").

hurz

7 years ago

First. Thermal runaway, no, because its already on its maximum of power point when cold! When it warms the power decreases. Second, each degree in temp does lower the Vbe correct, but this will be compensated by the 100k feedback. Third, here the 100k is the biasing and input swing is limited to less 5mV more means running on the exponentiell diode curve to create distortion. A H setup does need an extra emitter resistor, here for less gain a base (input) resistor would be fine to lower distortion.

kiani

7 years ago

This reply leaves no questions in anyones mind. Thank you + good karma for you.

kiani

7 years ago

A log amplifier!

hurz

7 years ago

Last comment, 20dB for a single transistor stage or you have to pay the price for distortion http://everycircuit.com/circuit/5501476305895424

kiani

7 years ago

Nothing short of perfect.and Btw thnx. @zorgrian for posting this very interesting cct. Good ideas never get old. http://everycircuit.com/circuit/6097594320420864

kiani

7 years ago

Btw @ Hurz what makes EC alive, it is not the software APP. But it is this community plus EC that has turned and produced the nearest thing to artificial intalligance with real living neurol network. EC or any othe simulator without this Collective knowledge is a dead simulator.

hurz

7 years ago

@kiani, what is that overdriven nonsense for?

kiani

7 years ago

Exaggerated so showing oporation in near non linear region.

hurz

7 years ago

You demonstrate clipping, your karma flys away

kiani

7 years ago

Yrs i realised since last night. Cct. Is not what i want it to be. A nonlinesr amplifier ( two quadrant). But maybe it can be made to be. Gona try.

LeButch

7 years ago

Ich habe eine harte Schale doch darunter eine weiche Seite. Dann wieder ne harte und danach komm nur noch Eingeweide.

sshsslfun

7 years ago

[BLOCKED]

kiani

7 years ago

@lebutch. I wrote a wrap and gave it ti google translate, it came up with what i posted. But just now i put it back into english ( through google) , and, disaster, this is not what i wrote, it has changed it si it doesn' t ssy what i wanted it to say. Google translate sucks. Soory i am removing it.

zorgrian

7 years ago

BTW, I agree with the artificial intelligence comparison, insofar as collective conscious minds work together better than competitive minds.

zorgrian

7 years ago

This topology which is 'self biased' adjusts for differences in gain of the transistor. It has many advantageous characteristics. However, it does result in a lower input Z than is sometimes needed.

kiani

7 years ago

Thx. @zorg, didn' t give the cct. The attention it deserved,. The bend in the f/b resistor against Vbe,,,, looks like non linearity, , that could be due to Ccb, or it is how close to it, oporate. don't know. Looked at everything on ( sucking) google, no mention of this bend.

kiani

7 years ago

@ssh didn!t know you wrap.

kiani

7 years ago

@ssh if you know music aling with anybody interested, trolls can come along too. We could do organise EC gig. Best wrap competition. Where everyone votes for their favorate,. Like x factor.

kiani

7 years ago

A wrap plus a circuit.,, the circuit is the entery fee. Circuit wrap. The aim, at the end of the day lots of circuits and lots of wrap and with music. The circuit entry bring us a not new but a different understanding of the same matter. Mind over natter.

zorgrian

7 years ago

Rap, man rap; not wrap with the cat on the street corner; with his disorder. Who's only daughter has been caught by court order. Black man black; its the colour of velvet; The rhythm that melts it and the white hand That takes it. Hit man hit; he's the motherfucker that hides In the corner. Don't give him the order or you'll Find he's much taller, than law and order.

hurz

7 years ago

he wraps knots in his tongue

kiani

7 years ago

Atomic kitten, quantum chicken. Rap if not wrap is not wrap,. so lets wrap rap.

kiani

7 years ago

@hurz invalid entry. Rap has to have more than one wrap.( just add another line and it be ok)

kiani

7 years ago

Btw why the curve ( in the base voltage and current feedback resistor, the v/t curve! ) . Is it operating nesr the non linear region!?

hurz

7 years ago

Why 1132mVpp input voltage?

zorgrian

7 years ago

Try the same plot with the 'normal' H bridge 4 resistor bias setup. See what happens...

zorgrian

7 years ago

Of course, if you pump too much voltage into this 'self' biased setup, you will hit a clip

zorgrian

7 years ago

Someone here might like to argue the existence of linear clipping?

kiani

7 years ago

In a H bias the curve is in iRb / Vc. Where as in this cct. Curvature is in iRb/Vb. Cause there is no emitter resistor vb must be set up very close to 0.7 v, ( peak) . The f/b arranges the operation very close to non linear regions of ( ib) . . Is it the non linearity that cause the cliping or the cliping that causr the non linearity. Of course the amps. Are set up for max. Swing, which is where things go non linear. So it is ironic that cliping happens. When a tras. Is used as a switched, isn "t it biased on the linear part of non linear section of vce/ic plot? So isn"t that cliping and linear?!

hurz

7 years ago

What a mess of nonsense

hurz

7 years ago

@kiani, spend some effort and compare them for yourself with the help of everycircuit. Only frequency/phase is bad for a selfadjusting setup everything else is more or less equal. Clipping (large signal performance), THD, noise, impedance in/out. But less components

kiani

7 years ago

Agreed totally nonsense, i read 📖 wiki on biasing f/b resistor, only a biasing technique, with the maths. Is much clearer. Should have read about it instead of looking for s/th that isn' t there. Thx. More the same.

zorgrian

7 years ago

Hmm

kiani

7 years ago

@zorg meant there is non sense in my messy attempt to describe my understanding and not the cct.

kiani

7 years ago

" I " wonder what happens if it is ran from a cinstant current source. I an gina chk it out. The whole cct. Is a potential divider, where one branch 🌿 is playful.

kiani

7 years ago

Turned it into a log amp. Any thoughts on this?! http://everycircuit.com/circuit/5491245962231808

zorgrian

7 years ago

So what is the intended use of this 'log' amp??

kiani

7 years ago

No idea! (Leaves us with more possibilities.)

zorgrian

7 years ago

I propose that we should use the log amp, as a powdered power fusion energy source. First, make the device, second grind the amp into super fine dust (sub atomic dust). Then, we use the exponential logarithmic curve to produce infinite energy using ....

kiani

7 years ago

The infinite energy is needed by the universe to exist on the edge of existance. Somehow it won' t let us tap into it's "dark" energy to use it to drive our cars, spparantly it ( the universe) has better ideas.

kiani

7 years ago

How about a ninja multiplyer, ?!

zorgrian

7 years ago

Reality is an illusion, admittedly a rather persistent one

kiani

7 years ago

Here a multiplyer ( attempt) using the new log amp. http://everycircuit.com/circuit/5272988340715520

kiani

7 years ago

Persistency is the proof of the truth of illusion. Isn' t it ?! A dream is a true and real illusion. Amongst lies, truth is an illusive fact, while lie(s) only try to be.

zorgrian

7 years ago

We only exist in the mind of a small insect that sits upon the back of a large dog who walks across the mountains