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Step 2VCO Schematic
The schematic below shows the two oscillators from the previous video. The first oscillator controls the second oscillator which is the VCO. The first oscillator is a fixed frequency oscillator and produces a low frequency square wave which the VCO translates into an alternating sequence of low and high pitched sound.
The two oscillators are both based on a single CD4069 Hex inverter chip. CD4069 is a very versatile chip that can be used for a myriad of digital and analogue applications. For example, Two inverter of an CD4069 can make a simple cheap and rugged square wave generator /digital clock (as in this example). One inverter of the CD4069 can be used as a buffer and to drive a heavy load (in this case it drives a computer microphone input decoupler covered in the next step).
The two oscillator are RC type of oscillator, meaning the resistance (R) and capacitance (C) set the frequency of oscillation.
the frequency is = 1/(2*pi*R*C)
A high resistance or capacitance produces a low frequency and vice versa.
The two oscillators are both based on a single CD4069 Hex inverter chip. CD4069 is a very versatile chip that can be used for a myriad of digital and analogue applications. For example, Two inverter of an CD4069 can make a simple cheap and rugged square wave generator /digital clock (as in this example). One inverter of the CD4069 can be used as a buffer and to drive a heavy load (in this case it drives a computer microphone input decoupler covered in the next step).
The two oscillator are RC type of oscillator, meaning the resistance (R) and capacitance (C) set the frequency of oscillation.
the frequency is = 1/(2*pi*R*C)
A high resistance or capacitance produces a low frequency and vice versa.
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