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10MV is quite a good voltage. Do not get within 20m of it.
If the transistor has reasonable curret gain, then the collector current is similar to the emitter current.
The voltages will be proportional to the resistors.
yes, my target is to adjust the components to achieve gain of 10 as the present gain is 12Is this a school question?
I have given all the information you need. The gain is the ratio of the resistors at present 10k/830.
What would you do to get a gain of 10?
thanks Sir,Your schematic was larger than my neighbourhood so I cropped it and now it fits my screen and looks normal.
The voltage gain is not 12 times, my simulation and calculation including the emitter resistance inside the transistor is a gain of about 11.5 times but the 830 ohms is not a standard resistor value.
I used 1k ohms to replace the 830 ohms and got a voltage gain of about 9.5 times. Add 20k parallel with the 1k to get a gain of 10.
thanks Sir,
i did as ur said but did not get the gain of 10, please my hfe is 300, my transistor is BC 108, also Ac signal is 10 milil volts, 1KHz
please will appreciate ur guidance
hfe is AC current gain and has almost nothing to do with a transistor's voltage gain.
The BC108 is very old and is not made anymore. A BC547 uses the same chip but in an epoxy package. A BC547B is a typical one and my new simulation uses it.
The voltage gain of a transistor with no additional load is the ratio of its collector resistor to its emitter resistor in series with the transistor's internal emitter resistance. Since the emitter resistor value is much higher than the internal emitter resistance then the voltage gain is roughly 10k/1k= 10.0 times. I added a 22k resistor parallel with the 1k emitter resistor to make the total emitter resistor 957 ohms since the internal emitter resistance of the transistor is 1k - 957 ohms= 43 ohms at this collector current.
My simulation shows the output is not clipping and the voltage gain is exactly 10.0 times.
Create the post #1 schematic in LTspice and use the component values Audioguru used.i still need you help kindly guard me on how to simulate LT SPICE
We don't do your homework. What help do you need? Show us your best effort at finding the answer.please also help me with this logic gate question