Hi
i would like to build a voltage controlled oscillator
i want the input voltage to be able to take 0-5 volts
i want the output frequency to be between 100Hz and 3kHz
so,
0v = 100Hz
1V = 600 Hz
2v = 1200 Hz
3v = 1800 Hz
4v = 2400 Hz
5v = 3000 Hz
the output frequency could be a linear relationship or a logarithmic one i don't mind, the part above is just an example.
my question is.
How do i design this as simple as possible, could a 555 timer do it?, or a schmitt trigger oscillator?
and how
would it be possible for someone to link or give me a circuit diagram with the formulas to use to design this ? XD
(side note.. by all means any amplitude output is fine, can be ether sine wave or triangle or square wave.)
its the input and output design i am having trouble with.
ultimately*
i would like to hook the output to a 100-200mV microphone so i can listen to the output on my PC.
circuits i have looked at but i don't understand
1. http://en.wikipedia.org/wiki/File:VCO.jpg
2. http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/oscillator
cheers in advance, i would much appreciate any HELP!
i would like to build a voltage controlled oscillator
i want the input voltage to be able to take 0-5 volts
i want the output frequency to be between 100Hz and 3kHz
so,
0v = 100Hz
1V = 600 Hz
2v = 1200 Hz
3v = 1800 Hz
4v = 2400 Hz
5v = 3000 Hz
the output frequency could be a linear relationship or a logarithmic one i don't mind, the part above is just an example.
my question is.
How do i design this as simple as possible, could a 555 timer do it?, or a schmitt trigger oscillator?
and how
would it be possible for someone to link or give me a circuit diagram with the formulas to use to design this ? XD
(side note.. by all means any amplitude output is fine, can be ether sine wave or triangle or square wave.)
its the input and output design i am having trouble with.
ultimately*
i would like to hook the output to a 100-200mV microphone so i can listen to the output on my PC.
circuits i have looked at but i don't understand
1. http://en.wikipedia.org/wiki/File:VCO.jpg
2. http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/oscillator
cheers in advance, i would much appreciate any HELP!