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How to Know the Specific beta of transistor?

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ppoorrttee

Joined Nov 23, 2008
7
One of my problems in designing a circuit in our project is knowing the SPECIFIC beta of the transistor to be used in computing.

Others say that it can be measured using multimeter and a resistor but I do not know at all. Anyone who knows about it?

Thank you.
 
Wendy

Wendy

Joined Mar 24, 2008
23,797
Generally beta is a loose figure with transistors. It has a wide range, even within a family, and you design for worst case.

A lot of DVMs have the feature you ask about. It really is better to plan for worst case though.

If you post a general schematic of your project I think we can talk you through it though, there is a lot of experience on this site with this.
 
mik3

mik3

Joined Feb 4, 2008
4,843
You can make a simple circutis with two resistors and measure Ic and Ib and then calculate beta.

beta=Ic/Ib

This beta is valid only for the transsitor you tested. Also, even for this transistor it is not constant but depends on Vcb and temperature variations.
 
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