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sound_boards:vc_oscillator [2020/11/04 19:19] admin |
sound_boards:vc_oscillator [2020/11/06 15:40] admin [Voltage In] |
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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|}}\\ | {{: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.\\ | ||
+ | |||
+ | It is designed to use for experimts and development together with a breadboard.\\ | ||
+ | {{:sound_boards:vc_oscillator_214943_rot.jpg?400|}}\\ | ||
---- | ---- | ||
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---- | ---- | ||
- | ==== Acknowledge ==== | + | ==== 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, but a diode is needed . An additional resistor can decrease the power of the syncing signal.\\ | ||
+ | |||
+ | Sync Source -----/\/\/----->|-----Sync Input | ||
+ | |||
+ | ---- | ||
+ | ==== Output ==== | ||
+ | |||
+ | If one wants to use it as a sound source one needs to attach a resistor and a 47µF capacitor to the output:\\ | ||
+ | + 47µF | ||
+ | square out----470 Ohm-----||-------Line Out | ||
+ | | | ||
+ | 120 Ohm | ||
+ | | | ||
+ | GND | ||
+ | \\ | ||
+ | + 47µF | ||
+ | triangle out----470 Ohm-----||-------Line Out | ||
+ | | | ||
+ | 150 Ohm | ||
+ | | | ||
+ | GND | ||
+ | |||
+ | ---- | ||
+ | |||
==== License ==== | ==== License ==== | ||