class ab amp

Thread Starter

abdus

Joined Mar 4, 2010
22
i have found this ckt of class ab amp..
i jst need some one to please confirm this ckt
one problem is that i have seen almost all the amps that one input must b ground,,but here its not like that ,,,why?
the link for this ckt is:
http://mrcshobbies.blogspot.com/
i have designed the one with 21w.(.according to my requirement..)
please help
 

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bountyhunter

Joined Sep 7, 2009
2,512
This is an AC amplifier and the input is capacitively coupled. That mans the DC level is set on the other side of the cap. I don't know why they return the input to the positive rail, but since it is capacitively connected to ground, it should work. I would return it to ground.
 

bertus

Joined Apr 5, 2008
22,290
Hello,

Thermal contact means that the body of D1 is touching transistor Q1.
It is mounted body to body.
You can use some thermal paste to have a good thermal bound.

Bertus
 

Thread Starter

abdus

Joined Mar 4, 2010
22
Hello,

Thermal contact means that the body of D1 is touching transistor Q1.
It is mounted body to body.
You can use some thermal paste to have a good thermal bound.

Bertus
so can u suggest me ,,that which circuit should i use for an amp?i mean which circuit u think is more accurate..?
 

tom66

Joined May 9, 2009
2,595
Thermally bonding D1 to Q1 improves the accuracy and response as both semiconductor devices have similar properties. If you only need a basic amp then this is unnecessary.
 
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