QFTmako321 said:My impression is that if somebody doesn't know how to do something and sees somebody else doing it, they will either think it's the best thing in the world from their own ignorance or think it's stupid, not knowing how hard it was to do.(people thinking that you can build a portable by "connecting a few wires together")
bentomo said:I did a true afternoon project. Just did it in one afternoon!
Thanks XCVG for that 555 timer diagram.
XCVG said:
The potentiometer changers the tone. Change the values of the resistors and capacitor to adjust further. We used a 9V power source but it should work down to 5V or so with reduced volume. R1, R2, C1 and the potentiometer affect the tone. R3 is the base resistor (is that what it's called?) for the transistor, I recommend you leave it unless you drastically change the supply voltage. R4 affects the volume of the speaker, it's probably reasonably safe to leave it out except for tiny speakers.