That's so you can't copy each other. Believe it or not, sometimes that happens.
Do you have to actually build this and get it working, or just design it?
Do you have to actually build this and get it working, or just design it?
For now we only have to design it, show that the simulation works, but later in the semester we will have to build it.
Well, if you do have to simulate it, then it's a significant design problem.
Just bear in mind that you're not going to get x100 gain with a single bipolar transistor,
especially with a 15kHz bandwidth. Try it and see.
Just bear in mind that you're not going to get x100 gain with a single bipolar transistor,
especially with a 15kHz bandwidth. Try it and see.
So I tried doing what you told me to and now I get a bigger gain but the simulation doesn't look normal I think. Is it ok for the output signal to be so unstable if that's the word I should use in this situation? Also, not pretty sure how I should choose the values for the components for the input gain stage.
The output is just clipping. This is because the input signal is more than needed to reach maximum output.
Either reduce the gain, or reduce the input signal.
Either reduce the gain, or reduce the input signal.
The component values in the gain stage are your assignment, and you'll have to show your work,
so look up common emitter amplifiers and see if you can design one stage with x100 midband voltage gain.
If your spec is frequency response 500Hz - 15kHz (-3dB), and the tone center frequency at 5kHz,
probably should use 5kHz for test purposes for now (if the tone controls are centered).
Also you can use a 3kHz square wave for visually verifying the midband flatness of response.
so look up common emitter amplifiers and see if you can design one stage with x100 midband voltage gain.
If your spec is frequency response 500Hz - 15kHz (-3dB), and the tone center frequency at 5kHz,
probably should use 5kHz for test purposes for now (if the tone controls are centered).
Also you can use a 3kHz square wave for visually verifying the midband flatness of response.
You can get 100x out of a single transistor if biased correctly. It's the distortion at higher outputs you don't want.
I used one for a tape head amp. 40mV output kept distortion low. Bc550 10k collector emitter to ground 10m bias. Hfe 500
I used one for a tape head amp. 40mV output kept distortion low. Bc550 10k collector emitter to ground 10m bias. Hfe 500
The feedback is taken from a resistive divider on the output. That means the unity gain will be approximately 5x with tone controls neutral.
A centre gain of 100 is a challenge for such a circuit but not impossible, though distortion will be higher.
To ensure uniform frequency response with neutral controls the impedance seen each side of the feedback network has to be the same. Note the 360 ohm input feed and the 1.8k feedback (in parallel with the 7.5k). So you could drop the tap resistor to 390 for a gain of 20, but I would not go that far. You could bootstrap the collector resistor of Q2 to boost the gain ... or ... I think that's enough clues for the time being.