Transistor matching

graham-r · 4th May 2009, 09:45 PM

Hello

I wonder if anyone could explain the process of selecting transistors for specific parameters such as gain etc, I often wondered especially now as I am about to modify my Hart/JLH class A amps.

Thanks

Graham

grhughes · 6th May 2009, 07:21 PM

Personally, I think it best to use a test circuit similiar to the final circuit you are going to use the transistor in, not a 9 volt battery. You have to operate the transistor close the voltage level in the final circuit and measure collector current. You will find that the transistors you bought vary much so buy about a 100. Ray

4th May 2009, 09:45 PM	#1
graham-r diyAudio Member Join Date: Nov 2008	Transistor matching Hello I wonder if anyone could explain the process of selecting transistors for specific parameters such as gain etc, I often wondered especially now as I am about to modify my Hart/JLH class A amps. Thanks Graham

6th May 2009, 07:21 PM	#2
grhughes diyAudio Member Join Date: Mar 2005 Location: Cubicle Sweet Cubicle, SW, MO, USA	TAKE A CHILL PILL! Personally, I think it best to use a test circuit similiar to the final circuit you are going to use the transistor in, not a 9 volt battery. You have to operate the transistor close the voltage level in the final circuit and measure collector current. You will find that the transistors you bought vary much so buy about a 100. Ray __________________ "The gift of imagination is the gift of the gods imparted to a few for which they receive innumerable kicks in the a$$ their entire life." Le Corbusier (Edward Jenneret)

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