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sound_boards:vc_oscillator [2020/11/06 11:25] admin [Voltage Controlled Oscillator] |
sound_boards:vc_oscillator [2020/11/26 01:44] (current) admin [Output] |
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| This is a small Voltage-Controlled Oscillator - the heart of every analog synthesizer. It provides a square and a triangle wave, and it could be hard synced, too.\\ | This is a small Voltage-Controlled Oscillator - the heart of every analog synthesizer. It provides a square and a triangle wave, and it could be hard synced, too.\\ | ||
| + | |||
| + | {{:sound_boards:vc_oscillator_214607.jpg?400|}}\\ | ||
| The OpAmp is a rail to rail [[http://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf|MCP6002]] from Microchip.\\ | The OpAmp is a rail to rail [[http://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf|MCP6002]] from Microchip.\\ | ||
| - | It is designed for experimental and design use. If one wants to use it as a sound device one should put a resistor and a capacitor to the output:\\ | + | It is designed to use for experimts and development together with a breadboard.\\ |
| - | square out----470 Ohm-----||-------Line Out | + | {{:sound_boards:vc_oscillator_214943_rot.jpg?400|}}\\ |
| - | | | + | |
| - | 120 Ohm | + | |
| - | | | + | |
| - | GND | + | |
| - | \\ | + | |
| - | + | ||
| - | + | ||
| - | + | ||
| - | {{:sound_boards:vc_oscillator_214607.jpg?400|}}\\ | + | |
| ---- | ---- | ||
| Line 49: | Line 42: | ||
| * **Potentiometers:** | * **Potentiometers:** | ||
| * 1x 100 kOhm | * 1x 100 kOhm | ||
| + | |||
| + | ---- | ||
| + | ==== Voltage In ==== | ||
| + | Any voltage between 0-5V at the VIN pin can control the frequency. Without any input resistor the potentiometer wont have any effect on the frequency. But with an input resistor and depending on its value both the potentiometer and the input voltage will define the frequency. | ||
| + | |||
| + | Voltage Source-------10 kOhm-------- Voltage In | ||
| + | |||
| + | ---- | ||
| + | ==== Sync ==== | ||
| + | |||
| + | For the Sync input one can use any 0-5V source, preferable a pulsed one. A diode in forward-biased direction is needed at the input. An additional resistor can decrease effect of the syncing signal.\\ | ||
| + | |||
| + | Sync Source -----/\/\/----->|-----Sync Input | ||
| + | |||
| + | ---- | ||
| + | ==== Output ==== | ||
| + | |||
| + | {{:sound_boards:vc_oscillator_patch.jpg?400|}}\\ | ||
| + | |||
| + | If one wants to use the VC Oscillator as a sound source one needs to attach a resistor divider and a 47µF capacitor to the output, depending on outputform it's 470/120 Ohm for the square output and 470/150 Ohm for the triangle output.\\ | ||
| + | + 47µF | ||
| + | square out----470 Ohm-----||-------Line Out | ||
| + | | | ||
| + | 120 Ohm | ||
| + | | | ||
| + | GND | ||
| + | \\ | ||
| + | + 47µF | ||
| + | triangle out----470 Ohm-----||-------Line Out | ||
| + | | | ||
| + | 150 Ohm | ||
| + | | | ||
| + | GND | ||
| ---- | ---- | ||