Pretty cool. There is pretty much only one method economic interesting to do agr is using a micro controller with adc, dac, enough opamps. in some some Arduino library for mpc4921 dac, you can find a math formula for a sine wave. it doesn't take much to figure out how to make the others. however changing speed is a subject.
@@AnalogDude_ this is just for testing purposes for me. Not practical as a vco. Would use a cd4046 or cd40106 and then a bunch of low pass filters to turn it into a sine wave for that. But as a function generator where i want to make a sine wave with an adjustable frequency, its pretty good.
@@igorbrichkov3632 well, if you full wave rectify the audio, you can measure it's amplitudes with the microcontroller, than use a dac to open a ota, like lm137000 with some math to take averages to function as agr. that's what i intended to say. i have a circuit to uses a opamp, 2/3 resistors and 2 equal capacitors to make sine wave. forgot the name of the oscillator. you only need a dual gang pot to adjust.
i just found: AS6C1616C with is a 16 bit or 2 x 8 bit sram chip, but requires 19 address lines, 16Mb. using 74HCT245 octal transceivers you can make the 8 bit data bus bi-directional between adc / dac and sram, to shut of the sound while recording.
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Pretty cool.
There is pretty much only one method economic interesting to do agr is using a micro controller with adc, dac, enough opamps.
in some some Arduino library for mpc4921 dac, you can find a math formula for a sine wave. it doesn't take much to figure out how to make the others. however changing speed is a subject.
@@AnalogDude_ this is just for testing purposes for me. Not practical as a vco. Would use a cd4046 or cd40106 and then a bunch of low pass filters to turn it into a sine wave for that. But as a function generator where i want to make a sine wave with an adjustable frequency, its pretty good.
@@igorbrichkov3632 well, if you full wave rectify the audio, you can measure it's amplitudes with the microcontroller, than use a dac to open a ota, like lm137000 with some math to take averages to function as agr. that's what i intended to say.
i have a circuit to uses a opamp, 2/3 resistors and 2 equal capacitors to make sine wave. forgot the name of the oscillator. you only need a dual gang pot to adjust.
@@igorbrichkov3632 Since i forgot the name of the Sine Wave osc, i made and upload a video for ya, with links to circuits. leave a comment : )
i just found: AS6C1616C with is a 16 bit or 2 x 8 bit sram chip, but requires 19 address lines, 16Mb.
using 74HCT245 octal transceivers you can make the 8 bit data bus bi-directional between adc / dac and sram, to shut of the sound while recording.
@@AnalogDude_ yes these are hard to get though