This is a very precise Tunable one transistor Amplifier designed to work at a very wide range of frequencies, such as anywhere between just a few hertz and even a few MHz...
(The other two transistors are not amplifying anything in case you wonder why I said it was a single transistor amp when there is 3 in the schematic).
HOW IT WORKS:
It’s pretty simple honestly, but the basic idea is one potentiometer (the left one) controls the amplitude of the input signal, while the other potentiometer controls the voltage level of the signal (which basically just means that it shifts the midpoint of the whole signal to just about whatever voltage level you want; for Ex, if the level set to 1v then the signal will vary halfway above and below that 1v level or even 5v if you adjust as so.
If planning to use at that high of a frequency, make sure your transistors are rated to have a high enough transition frequency, and make sure the capacitor is of appropriate size if your not getting nice results especially at only a couple hertz on the lower end (but really there’s no need to alter the size capacitor even if your varying the frequency, so you don’t have to mess with any component values unless the output is not adjusting properly)
