in my city components are not available easily so that is why i wanted a good circuit simulator software Sir so that i can simulate the circuit before a make one pls suggest me one good circuit simulator software
I Really Appreciate your Support Sir thank you very much for that but the problem is i will not be able to understand this article because i am Commerce graduate Bertus SirHello,
Have a look at this page of the eBook:
On that page there is a section called Collector-Feedback Bias, what you are using in your schematic.
Variations in bias due to temperature and beta may be reduced by moving the VBB end of the base-bias resistor to the collector as in Figure below. If the emitter current were to increase, the voltage drop across RC increases, decreasing VC, decreasing IB fed back to the base. This, in turn, decreases the emitter current, correcting the original increase.
Write a KVL equation about the loop containing the battery, RC , RB , and the VBE drop. Substitute IC≅IE and IB≅IE/β. Solving for IE yields the IE CFB-bias equation. Solving for IB yields the IB CFB-bias equation.
Find the required collector feedback bias resistor for an emitter current of 1 mA, a 4.7K collector load resistor, and a transistor with β=100 . Find the collector voltage VC. It should be approximately midway between VCC and ground.
The closest standard value to the 460k collector feedback bias resistor is 470k. Find the emitter current IE with the 470 K resistor. Recalculate the emitter current for a transistor with β=100 and β=300.
We see that as beta changes from 100 to 300, the emitter current increases from 0.989mA to 1.48mA. This is an improvement over the previous base-bias circuit which had an increase from 1.02mA to 3.07mA. Collector feedback bias is twice as stable as base-bias with respect to beta variation.
Yes, I was getting to that. I was going to wait to hear from the TS if there is any problem with hum.It would, however, be advisable to decouple any power rail noise by, say, replacing R1 with a couple of 4k7 resistors in series and connecting their common node to ground via a 100uF cap.
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