# vol 3 chap 4/13

Discussion in 'Feedback and Suggestions' started by va-sawyer, Aug 11, 2014.

1. ### va-sawyer Thread Starter New Member

Aug 11, 2014
3
0
I am confused by the math.....
26 mV/1mA = .26 ohm. On the next line it says R= re times Beta.
If Beta is 100 then shouldn't R=26 ohms, and not 2600?

I went back and read it again..... I think the first equation is in error... it should be 26 ohms and not 0.26 ohms.

Last edited: Aug 11, 2014
2. ### Ramussons Well-Known Member

May 3, 2013
750
131
Vol 3 Chap 4/13 of which book ? I don't know.

But 26 mV / 1 mA = 26 Ω. That I'm certain

Ramesh

3. ### va-sawyer Thread Starter New Member

Aug 11, 2014
3
0
I'm refering to the E-Book on this site. They have two equations. The first shows 26mV/1mA = 0.26 ohm. The second one multiplies that result by Beta (100), and gets 2600 ohms as the final answer. It was very late at night, and I was reading it on my phone, but I still knew that 0.26 X 100 did NOT equal 2600.
So, Volume 3 - Semiconductors, Chapter 4 BJTs, Section 13 Impedance Matching.

4. ### Ramussons Well-Known Member

May 3, 2013
750
131
The first equation has a Printers's Devil. It should be 26 Ω.

Ramesh

5. ### Georacer Moderator

Nov 25, 2009
5,181
1,289
Error confirmed. Thank you very much for reporting it!

6. ### Dcrunkilton E-book Co-ordinator

Jul 31, 2004
418
11
Thanks va-sawyer, and all,

Thanks for finding this error.

Your corrections have been entered at ibiblio.org

Dennis Crunkilton