Develop a 4 tone generator
frequencies 400, 600, 800, 1 khz sine wave output at 4volts. The frequencies do not need to be exact ( within +/- 20 hz) however the do need to be modifiable either by setting or by changing a resistor or something like that.
power: must be able to run off a 9V battery
components must cost less than $5.00 (or $500 f...
Skills: electronics, circuit design