Main Question or Discussion Point
How do I know, how big of a voltage gain for an amplifier do I need, if I want to increase the input frequency from 250 Hz to 50 kHz?
It is very unlikely that you would be building a circuit to do what you seem to be saying. Perhaps you could explain what you would like to achieve, then we can tell you how to go about it?How do I know, how big of a voltage gain for an amplifier do I need, if I want to increase the input frequency from 250 Hz to 50 kHz?
Ok, I want to increase the frequency of an audio source from 250 Hz to 50 kHz so I can hear it via inner ear...Roughly speaking...It is very unlikely that you would be building a circuit to do what you seem to be saying. Perhaps you could explain what you would like to achieve, then we can tell you how to go about it?
There isn`t a circuit yet, because I don`t have nearly enough knowledge to build one yet, that`s why I want to know, how to go about it. I simply want to increase the frequency of an audio source from 250 Hz to 50 kHz so I can work with ultrasound, listen to it by using my inner ear.Without knowing the details of your circuit I don't think we can help you.
I do have a 50 kHz square wave generator, it would be possible to mix it with the audio source, but what would happen to the frequency of the mixed signal?Yes, they are verily possible. We can double or triple frequency using some simple circuits. The doubled or tripled frequency signals can be used for various applications.
Take the case of microprocessors. A faster clock frequency(say twice or four times) means faster operation in sequential circuits.
But it is not much use of increasing frequency by 200 times( either for sine or square eaves).
Instead of increasing frequency from 250 Hz to 50Khz, you can generate 50KHz output itself.
http://www.topqualitytools.co.uk/atomiser-ultrasonic-liquid-1-65mhz-m165d25/?gclid=CjwKEAjwsMu5BRD7t57R1P2HwBgSJABrtj-RSZsII55UH4lAyheqgLOQGEeq2dm9l1Fi69zGYIMpKRoCuNnw_wcBThe amplifier does not need a different gain for a different frequency. It needs a greater passband. Audio power amplifiers often have an ultrasonic filter to prevent parasitic oscillation in the output stage. That may block your 50kHz.
What type of transducer will you use? What is the frequency response?
To compensate for the frequency response of the transducer may need to change amplifier gain.
With 50kHz you will probably feel very irritated, but you will not perceive it as a sound.
How good were your ears. If you are not very careful you will probably damage your ears in the experiment.
No, I meant by using an audio mixer of sorts to combine the two signals and create a third one, just that the third frequency most likely won`t be at 50 kHz.What do you mean by the term "mixing"? does it mean voltage addition(adding function generator waveform and audio signal)?
An ultrasound transducer can output sound in this frequency range and thus the inner ear can perceive it...Ok, then which one would you suggest a transistor amplifier or a frequency multiplier?So, you want something like 50 Khz? If you want some mixing you can use the principles used in Amplitude modulation, where both the signals are multiplied. But, i doubt the usefulness of the method.
Leaving the circuit construction aside, how can you sense ultrasonic waves? Don't we need an ultrasonic sensor?