How to Harmonize a Homemade Synthesizer

Video Transcript

This is Lorin Parker for Expert Village and I'm showing you how to make a cool oscillator synthesizer here. And we have already done the light control, and now what we are going to do is since this chip has six circuits within it, we are going to use more of these circuits. We've used pin 1 and 2 which is circuit 1, but pin 3 and 4, 5 and 6, 7 and 8, 9 and 10, all have circuits as well. So let's use the next one in row which is pin 3 to pin 4. So all we have to do is hook it up the same way that we hooked up the original pin 1 and 2. So I'll move this out of my way, that's the output from pin 2, and so now I'm looking at pin 3, and I'm going to hook up a capacitor to pin 3, and I'm going to hook that into ground just like I did with pin 1, and so pin 3 is just like pin 1, it's a copy basically. And then, just like I put the photo resistor in between pin 1 and 2, I'm going to do it between pin 3 and 4. So now we have a little copy there. And I need to get output from this, so it's the right side of this, it's the output side, the side without the capacitor, pin 4, that's going to give us our sounds. And so now we're going to have a choice, if I turn this up, we can use the original one, or if I switch my signal here... we have a bum capacitor there, what do you know, so I'll just quickly swap out that capacitor with a different one. I was looking at it and I thought it looked a little funny. Every once in a while you get some sort of strange looking capacitors, and I hooked it into the wrong side in all my haste. So pin 3 to ground, this one will probably be a little higher pitched, there we go. So this one reacts, light is normally making a high frequency, and now as I take the light away, it brings it down to a lower frequency. So now I'm going to show you how we mix these two signals together. We're going to mix them together by passing them through two resistors. So I take one resistor here and I take it from two different rows, and now we're going to take our output from this row coming out. So I connect up another resistor, and these are equal value, these are both 100k resistors. But the inputs are going to be different. So I put the input side of the resistor in a different row. So this one's in this row, and this one's in this row, but they both come together at the output. Now I take my wires for the output of each oscillator, plug it into the same row as the resistors, and I can clip my lead onto both resistors at once, and now we have two oscillators, two light controlled oscillators mixed together.

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