555 Timer Tone Generator. Which capacitor should I use, and where do I add the power source? Please help!?
I'm wanting to make a tone generator with a 555 timer that is a frequency humans can't hear. I'm going to follow this schematic. My R1 (potentiometer) will be 10k. R2 will be 33k. C1 will be .001mF. What should capacitor 2 be? And would the resistors i mentioned work for making a tone within the 17-20 Khz range? Also, how and where would I attach the power source? I'm thinking about using a 9 volt battery. Or would something else work better? I want it to be able to run for several hours straight. Thanks! http://www.reconnsworld.com/audio_tonegenerate.html?
EDIT: Also, I want it to be a constant tone, not a beap.
If I have this completely off please let me know and guide me in the right direction. I'm new to this and would greatly appreciate any advice you may have.