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Flip the SPDT switch to see the action, alter values of the capacitor or resistor to change the slope. The rising and falling slopes will always be equal (50%) regardless of the values changed, unless you convert the single resistor into a voltage divider, and feed a D.C control voltage to the center tap (this will let you adjust the rise and fall times, but only simultaneously and inversely, not individually, which is usually preferred anyway I think. If you’d rather adjust them individually though, just split apart the center tap and use two separate control voltages instead.
*Note:
1. If you plan on using the output to drive anything, it will almost always need a voltage buffer with pretty high input impedance (and a much faster response time the higher you go in frequency)
2. Replace the SPDT switch with a square wave generator to create Triangular oscillations out of this, but make sure you account for the timing differences on your own by adjusting values or frequency, it can be tricky without using feedback though. Square wave signal must be 50% duty cycle (unless you’ve modified it similarly to how is described above), and match the exact same high/low voltage levels (of the square wave signal) to the same high/low voltages levels that the 2 output transistors’ emitters are tied to! …Any small differences will be quite noticeable, so it’s pretty important the voltage levels are as well matched as possible!
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