Rich Grise said:
You could do it with a couple of 555s, (or a 556), a 4-bit binary
I am not sure what exactly you mean to be honest, can you draw
up some circuit.
counter, and some gating logic. And yes, this can be made to drive
a piezo, and in fact, there are special piezos made that serve both
the function of the frequency-determining (feedback) element AND the
audio output transducer. They use one transistor and one resistor.
But you'd still have to generate and gate the pulses that turn the
beeper on.
Maybe, I know nothing about piezos except that I really like there sound
much better than a speaker. Mind you, when I say that I am not too
bothered about the quality of the beeps this is not entirely true. I would
very much like to have this special sound quality which alarm clocks
have, as I am used to it, and because it sounds professional. Any idea
how this sound is generated?
Or you could get a beeping Sonalert, for about fifty bucks. =:-O
No, idea what this would be, though the price is ridiculous - out of
the question.