I made an oscilator, but i need a amplifier to change the amplitude

Thread Starter

Mixim

Joined Oct 26, 2023
8
I made this oscillator and the output voltage is 1V, and I need another amplifier to go to 5V and some mv ideally to 10mV, but that is harder.
I made this but it doesn't work very well and I don't understand why.

I can't work with OpAmps, with only transistors.

I put a common emitter with a resistor in the emitter, which I think is called a degenerated common emitter.

Do you have any other ideas?
I attached the .asc file if you want to play with it.
Thank you in advance!!!
P.S. I tied some stuff before so sorry for the mess.
 

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Thread Starter

Mixim

Joined Oct 26, 2023
8
I made that but the maximum is 2.8V. I think i should work on the amplification of the transistor maybe make it common emitter .
Nevermind I've added a new stage it works but i should refine it to make it sinusoidal.
Thank for the R17.
 

dl324

Joined Mar 30, 2015
16,691
Not quite, its an optional thing and I was curios how to do it. It's out of curiosity.
Even so, you'll learn more if it's treated like homework.

What is the value of R18? What is the frequency range of the input?
1698943614331.png
Do they teach you to use so much whitespace and unnecessary wire jogs?

I see that this thread has been moved to the Homework.
 

Thread Starter

Mixim

Joined Oct 26, 2023
8
Even so, you'll learn more if it's treated like homework.

What is the value of R18? What is the frequency range of the input?
View attachment 306490
Do they teach you to use so much whitespace and unnecessary wire jogs?

I see that this thread has been moved to the Homework.
I made these changes to increase the voltage, the frequency is variable from 250 to 10k Hz.
The whitespace is for me to manage everything, this is the first time i do something so elaborate, for me at least and i don't know what you mean by wire jogs.
I'm sorry, I'm just a beginner.
 

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