Electric Circuit Experiments: Oscillator Function

Video Transcript

"Making changes with electricity by manipulating Jello here, by sticking pins in a potato, by adding in lemons, things like that. But we wouldn't even know anything is going on unless we had some way to see this, or to hear it. So, in this case, we're hearing it, and what's allowing us to hear it is this guy right here. I have bread boarded a Square Wave Oscillator and it's just one simple chip that costs about fifty cents, it's a 74HC14 and this is being powered by two AA batteries, across pins one and two I have a Resistor of about 22 Kilo Ohms, and then from pin one to ground I have an Electrolytic Capacitor that is about 10 Microfarads. Alright, so, but essentially what that's doing is it's creating a wave form, it's creating a tone. That tone is dependent upon the resistance or the capacitance of these foods that I'm adding in, or these organic substances I'm adding in. And adding in those organic substances, or Electrolytes, is changing the action of the Oscillator and we can hear it as a change in the frequency of the Oscillator. So, it's more of an indicator rather than an instrument in itself."