Help me understand complementary push pull amp

[lancaIV]

Pardon,if you see this as spam !


I would have to read the total article ,beginning with the not existant "red arrow" in your offered diagram but in the other Class schemes !

                     " Red arrow now shows current flowing in opposite direction."

This is high fidelity spectrum ! Like https://translate.google.com/translate?sl=de&tl=en&u=https://www.abacus-electronics.de/

[nix85]

Pardon,if you see this as spam !


I would have to read the total article ,beginning with the not existant "red arrow" in your offered diagram but in the other Class schemes !

                     " Red arrow now shows current flowing in opposite direction."

This is high fidelity spectrum ! Like https://translate.google.com/translate?sl=de&tl=en&u=https://www.abacus-electronics.de/

No worries, it's just that saying a lot of stuff without really saying anything doesn't help.

I read the whole article, it never addresses the issue.

Yes, red arrow shows current flowing in opposite direction.

Someone around here should know this. I guess it will be answered within day or two max.

[AlienGrey]

Here is an article on push pull amps.

https://www.electronics-tutorials.ws/amplifier/amp_6.html

Second diagram shows two NPN transistors back to back and you can see how current flows for each halfcycle as nicely drawn.

But i don't understand NPN PNP combination, first diagram, shown below.

During positive halfcycle TR2 is off, TR1 conducts and current flows through it and through load to ground.

All sweet, but...http://overunity.com/Smileys/default/cool.gif

During negative halfcycle TR1 is off, TR2 is on and.....? How does the circle close?

TR1 is off, Vcc is disconnected.

Red arrow now shows current flowing in opposite direction.

Something's missing in these diagrams (they are all like this).

The problem with this circuit is as a half an H bridge you only get half the power of a hakfl H bridge ! shock horror 

Be aware if you use 2x N channel  Mos fets as per IR2184 totem pole driver, and you pull up the Drain to the supply rail you have a problem!
as that top supply Mosfet cant get an up to 12 volt turn on bias unless you use a an extra pull up bias power supply.

The same applys to bipolar circuits too but at a lower bias voltage.

Also you need to use a pair of charge capacitors between the half bridge - load - split supply or you blow up or over heat
one of the transisters thus blowing them both up.

And my name is (Alen > Alien) close aim it not Adrian, Adrian is some onme else.

[forest]

I cannot help much because PNP transistors are difficult to me also but.... maybe there is something missing like -VCC source ?
https://d2vlcm61l7u1fs.cloudfront.net/media%2F5bd%2F5bd89220-5060-45e9-844b-de518d8e6073%2FphphnBCzU.png

[AlienGrey]

I cannot help much because PNP transistors are difficult to me also but.... maybe there is something missing like -VCC source ?
https://d2vlcm61l7u1fs.cloudfront.net/media%2F5bd%2F5bd89220-5060-45e9-844b-de518d8e6073%2FphphnBCzU.png

the transistor QI reacts to over heating of the two transistors mount it as close to them as possible.

Note there is no over currenrt protection !