hi all, i am new to the world of electronics so you will have to bear with me. I simply want to make a compact circuit that creates a beep when a circuit is made and then repeats at a set interval until the circuit is broken. The problem is i want use a small 3v battery like a CR2032 or similar (i could possibly use 2) but i dont know what voltage a 555 requires. would i be better using a ICM7555? i understand the monostable circuit but am struggling with the maths involving the beep duration and interval. does the voltage change the math? I was wondering if someone could tell me what components to use, resistors, capacitor, buzzer? i want a 2 second beep repeated every 20 seconds.
All help would be appreciated.
matthew
All help would be appreciated.
matthew