how to choose impedance matching transformer?
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 4th October 2011, 09:28 PM #11 diyAudio Member   Join Date: May 2007 Who is struggling?
 4th October 2011, 10:09 PM #12 Sin Bin   Join Date: Jun 2011 OK I get re=26/0.9=28.88r*hfe=160 Q2 input impedance=4,622.22r ohms. Voltage at R6=(R5/(R4+R5)*9)-0.6V=0.9V Q2 collector current=0.9mA.
 5th October 2011, 03:23 AM #13 diyAudio Member   Join Date: Jan 2010 ehm.. why would u say it is a student cheating on homework? since we can have open discussion here and i do not ask for the straight forward answer.i do provide all the calculations and the ideas. and to show it the following is my calculations (if refer to the figure i shown): Zin(2nd stage) = rb || (beta)(r'e) rb= 20k||4k = 3.33k Vb= (4k/ 24K)* 9V = 1.5V Ve = 1.5 - 0.7V = 0.8V Ie = 0.8V / 1k = 8 x 10-4 r'e = 25mV / 8 E10-4 = 31.25ohm Thus, Zin(2ns stage) = 3.33k || (160)(31.25) = 2k ohm Last edited by motbuddy; 5th October 2011 at 03:39 AM.
 5th October 2011, 03:43 AM #14 diyAudio Member   Join Date: Jan 2010 FYI, before that i calculate the Zin of 2nd stage is 1.06kohm is because i take the beta value inside the figure which is 50. For the latest calculation i take the beta value as 160 (which is my 2N3904 beta value)
 5th October 2011, 11:11 AM #15 diyAudio Member   Join Date: May 2007 I have been careful not to provide motbuddy with the answer, but to guide him towards finding the answer himself. I believe this is what he wants. You will note that I have asked a lot of questions. If he was simply looking for an answer he would probably have given up by now.

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