vielle568
Member
Hi Everyone,
I'm building a musical instrument and I need a series of 12 oscillators to create the base for a chromatic octave. I've tried using a 50240 chip and it works OK (using a crystal oscillator as the clock) but the IC is something from the 70's and draws a lot of current and it's far too much for my battery powered project.
I've been trying to use a simple circuit based on a 7414 inverting buffer IC (schematic below). There's just a capacitor and a resistor controlling the frequency and I can get the range I want (200 to 500Hz), but the circuit isn't completely stable and tends to waver and drift over time.
Does anyone have any suggestion for either: 1) a low power, low frequency oscillator that is stable and will not drift, or 2) a method (or an IC) for dividing a frequency into the twelve tones required for an octave?
Thanks for any suggestions,
Vielle568
I'm building a musical instrument and I need a series of 12 oscillators to create the base for a chromatic octave. I've tried using a 50240 chip and it works OK (using a crystal oscillator as the clock) but the IC is something from the 70's and draws a lot of current and it's far too much for my battery powered project.
I've been trying to use a simple circuit based on a 7414 inverting buffer IC (schematic below). There's just a capacitor and a resistor controlling the frequency and I can get the range I want (200 to 500Hz), but the circuit isn't completely stable and tends to waver and drift over time.
Does anyone have any suggestion for either: 1) a low power, low frequency oscillator that is stable and will not drift, or 2) a method (or an IC) for dividing a frequency into the twelve tones required for an octave?
Thanks for any suggestions,
Vielle568
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