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Can someone help me to find the hybrid pi model of such transistor configuration? Assume Hfe = 90, the input voltage is applied in series with capacitor C2, (0.082uF) and Vout it from the red dot between C3 and R7 with respect to ground. Thats my 1st conclusion

So, I came to this conclusion, Im not really worried about the input impedance, What Im worried how to calculate the voltage across R4 in the second drawing with respect to ground.

  • \$\begingroup\$ That right there looks like a homework question. If you're hoping for an answer, you need to show us your attempt at solving. Explain what you know and make a hypothesis that we can correct/verify. \$\endgroup\$
    – K H
    Dec 14, 2018 at 23:34
  • \$\begingroup\$ Not a homework question, we talked before about another SQ decoding network, turned out I ended up giving up on such circuit and found a new one. It is full shown on this site art-and-technology.blogspot.com/2015/12/… \$\endgroup\$ Dec 14, 2018 at 23:38
  • \$\begingroup\$ I could just solder the components, and listen to the records, but I want to understand the workings, and, maybe, expand the frequency range on which it is supposed to be phase shiffint. \$\endgroup\$ Dec 14, 2018 at 23:39
  • \$\begingroup\$ Anyway, to be more specific, Ill draw my conclusions and the point where I got stucked. \$\endgroup\$ Dec 14, 2018 at 23:40
  • \$\begingroup\$ People will be more lenient with you if it isn't a homework question, but you may wish to include something to the effect of "I know that a hybrid pi model represents a circuit in suchandsuch a way, and I understand how this piece and that piece fit together but I'm not sure how to represent that". Ideally people want enough information to know where your knowledge is lacking so they can tailor their response a bit to your needs/educational background. \$\endgroup\$
    – K H
    Dec 14, 2018 at 23:48


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