1) With the oscillator we’re studying the comparator outputs a _______(square) wave and the integrator outputs a _______ (square/triangle )wave.
2) With an integrator, if Vin is positive the output voltage ramps ______down (up/down). If Vin is negative the output voltage ramps _______up (up/down).
3) With a comparator, if the op amp’s + input is connected to a greater voltage that that connected to it’s – input, the op amp’s output will be about _____ negative(positive/negative) 9v DC. If the op amp’s + input is connected to a lower voltage that that connected to it’s – input, the op amp’s output will be about _____ positive(positive/negative) 9v DC.
4) There’s a formula for how fast the integrator ramps up or down:
change in volts per second at Vout = -Vin / RC
So the bigger the resistance R you use the __________slower (faster/slower) the ramp gets, and the bigger the capacitor gets the __________ faster(faster/slower) the ramp gets.
5) The circuit at the end of this video is a monophonic synthesizer – it can only output one tone at a time. What do you think would have to do to make a polyphonic synthesizer that could play 2 notes at the same time? 3 notes? 4 notes? 100 notes?
have multiple output, I think it will have to be multiple units of the oscillators each assigned to a potentiometer that determines its frequency.
Tiankai Li 