Hackaday: Today we’ll take a journey into less noisy noise, and leave behind the comfortable digital world that we’ve been living in. The payoff? Smoother sounds, because today we start our trip into analog.
If you remember back to our first session when I was explaining how the basic oscillator loads and unloads a capacitor, triggering the output high or low when it crosses two different thresholds. At the time, we pointed out that there was a triangle waveform being generated, but that you’d have a hard time amplifying it without buffering. Today we buffer, and get that triangle wave out to our amplifiers.
1 comment:
I’ve learnt about a capacitor, (and the fact that voltage cannot change instantaneously) for a while now in my Electrical Engineering class, so its great to learn more about the practical applications of this concept! I really loved the way the author explained these concepts. I definitely had to use my background knowledge though ( about op amp circuitry for the idea of a “buffer,” and understanding distortion at a basic level, etc.)
I did not know anything about the 4069UB hex (unbuffered) inverter! I found out it is just 6 independent NOT gates chained together. Apparently, some hex inverters use hysteresis, (where a property lags behind the physical mechanism causing said property) to remove noise. But hysteresis can be used broadly in things like a temperature sensor, where hysteresis can dictate a “range” that the temperature sensor can live at while keeping at an ideal temperature. This 4069UB doesn’t use hysteresis, which means the amplifiers can be used for analog instead of digital purposes.
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