In retrospective, I think Guitar Frequency Quadrupler is a misnomer, as the circuit can process any signal within the normal guitar range (82~1320Hz). The input signal is first amplified, compressed and filtered. The complicated part is leaving the fundamentals untouched and attenuating partials at least by 12dB, over the entire frequency range of interest, this requires a frequency tracking filter and a set of well tuned band reject filters, switched according the right frequencies at the right moment. The effort in developing and tuning the switched filters is recompensed when we hear a quasi sine wave at the filters output, maintaining a nice constant amplitude over the guitar range. The frequency multiplication circuits that follows requires this clean signal in order to work best. The multiplication is made in two distinct steps, first a precision full wave rectifier doubles the signal frequency, its output is then transformed into a square wave and sent to a second frequency doubler, this time made with CMOS logic. This final frequency quadrupled signal can then be used as a two octaves higher transposition effect, can be frequency divided in order to get a different transpositions: divide by three still provides an interval above the initial signal fundamental, divide by five, six or seven will be within the first octave bellow fundamental, and etc... Another use of the quadrupled frequency signal is to derive a frequency to voltage converter using higher cutoff filters, and hence getting faster frequency to voltage conversion with less ripple. Join this channel to get more in depth information and exclusive content: https://www.youtube.com/channel/UCQxQy-Z7SF7LFKsvSpqrTXg/join Thanks for watching. ... https://www.youtube.com/watch?v=7kB3RwQ-4LI

Using the Arduino Clock Divider and Logic thing module in order to generate a real time harmony accompaniment to a Modular Analog Guitar Synthesizer (monophonic) melodic improvisation. Trigger pulses generated by the guitar synth at each plucking on the electric guitar strings are used as the clock source to be divided by the Arduino Clock Divider and Logic thing module. The Arduino Clock Divider and Logic thing module not only provides divisions of the clock, but also uses boolean logic combinations from these divisions to generate rhythm patterns and create melodic/harmonic data converted to 1V/8ª control voltages. Join this channel to get access to more in depth information: https://www.youtube.com/channel/UCQxQy-Z7SF7LFKsvSpqrTXg/join . Thanks for watching. . #guitarsynthesizer #analogmodular ... https://www.youtube.com/watch?v=LNJTy56YJmg

Gamo Expander .177 0,49g (7.56 gr) pellets BC. Using two chronographs and Hawke ChairGun freeware. Thanks for watching. Airgun Shooting and Related Activities: https://www.facebook.com/BatSkull.ASRA ... https://www.youtube.com/watch?v=BYKzBh7BSYg

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