A triangle wave oscillator for the last version of the modular analog guitar synthesizer. This oscillator works like the saw PCO (Pulse Controlled Oscillator), being controlled directly by the guitar audio signal fundamental transformed into a square wave. The principle is the same as the GR-300 'Duet' oscillator, but here the output is a triangle wave with constant amplitude over the entire guitar range. I like the sound of the triangle wave, and even more the resultant sounds possible through waveshaping processes, mainly using Serge waveshapers, and also by simply injecting some extraneous current in the oscillator integrator.
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An octave divider implemented with CD4013 CMOS flip-flop divides the input signal frequency by two and by four (one and two octaves down). Being a logic device, the outputs of the flip-flop are square waves. Two dual opamps are employed to provide input and output buffer and to transform the input signal into square waves. The circuit is very simple and works well with symmetric periodic signals. Tests with static sine wave, and with triangle wave from the Guitar Tracker Synthesizer.
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Just a quick update about the homemade slugs experiments, before starting the video:
they will continue as soon I manage to get some spare $time$...
I will try the casting method again, using materials other than
plaster of Paris to make the molds. The goal of the experiments is to produce a slug weighting around 28 to 34 grains (1.8 - 2.2 g) that will fit in the BT65's magazine, and precise enough
to group below 3 MOA consistently at 50 yards, with muzzle energy above 75 Joules.
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https://www.youtube.com/watch?v=3e5oKVnN13E
Matrix II modular analog synthesizer Frequency DIVIDER.
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https://www.youtube.com/watch?v=xpAtoNyOe08