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The 'wobble bass' effect is made by modulating(or fastly moving back and forth) the cutoff frequency of the VCF. This can be done manually with a potentiometer, using an LFO circuit, or using a control signal generated digitally (possibly the waveforms generated by the Mozzi library for the Arduino). If you want a greater understanding of this systems ...

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Look carefully at the specs for a digital pot, since they often are quite different than what you expect. For example, look closely at these issues: Noise: Digital Potentiometers (DPs) often have terrible noise performance. Rarely better than -80 dB THD+N, and often only -60dB or worse. Many pots don't even put noise figures in the datasheets. DPs are ...

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You will need the above mentioned LM13700/13600 operational transconductance amplifier. Check out the datasheet, they have application examples such as VCF or VCO. The OTA converts voltage to current and allows you to control filter, oscillator, etc. with voltage. Unfortunately VCA, VCF and VCO all use current (resistance), hence the need for an OTA. You may ...

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No. Hint: $X_c = \dfrac{1}{2 \pi f_c C}$ however, you have used the expression for the reactance of an inductor.

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Here's a comparison and some numbers: I run single crimped wires of length between 3" and 24", sometimes with multiple hops, and at 2 megabit data rate. The signal is 5V UART TTL, and the driver is an Atmega microcontroller (25 mA nominal pin current) with a 70 ohm current limiting resistor and a dozen or so 40 picoFarad MOSFET inputs on the other end. ...

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I wouldn't run CAT6 cable for HF analog signals... too much interference, too much induction. When it comes to high freq signals (typically greater that 500kHz) the quick and dirty solution is RF specific equipment. As described before, the interior capacitance of DC wiring and cabling terminals can cause a lot degradation and reflections. Coaxial cable is ...

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The best way to do this is to being the signal into a counter/timer channel of the microprocessor. Configure the counter/timer to operate in counter mode. If you can count the pulses for a set interval of say one second would give you a reading of pulses/second from the motor. There will sometimes be a situation where waiting one second is intolerable ...

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