How do multi transistor amps work?

[cjruger]

Im in the process of teaching myself basic electronics related to ham radio and studying for tech class test. Im curious how amplifiers work. Say we had a 10 meter amp with 2 sd1446 transistors. Its fed from a transmitter outting out 2 watts. Does the signal go thru in a series or parralel thru the transistors. If they are rated at 75 watts, a series would be too much for the second transitor to handle. If a parallel how to bith transistors combine for more than the 75 watts?i know im prob way off in my thinking but i dint get this

 

[Moleculo]

In the configuration you're referring to, the transistors in the amplifier would typically be in a "push pull" configuration. The best advice I can give you to understanding that is to google it and read up.

 

[Crusher]

Or see if you can locate some of the motorola rf device data books. Lots of schematics, even more theory behind it. Will explain a lot. Also communications concepts may have some stuff to read up on as well. I think they have a few of the motorola applications notes. Worth reading.

 

[The Mad Scientist]

Glad to see you have a genuine interest in how amplifiers work.

Good luck in your research.

 

[Shockwave]

In the common "push pull" configuration used in many amps, only one of the two transistors will be producing power at any given time. The load is shared between the two transistors where one is responsible for making the negative portion of the sine wave while the other reproduces the positive alternation.

 

[Crusher]

Under the motorola applications notes, there is a section on broadband transformers. A section on power combining for combining multiple 2 pill/transistor sections. Another good book to read is either Vol. 22 or 23 of "The Radio Handbook" by Bill Orr. A great book to have in any library.