Buy "Timer" OTC?
My wife, recovering from serious back surgery, is in therapy and has a list of exercises to perform.
But she doesn't like counting out, one-thousand-one, one-thousand-two....
She asked me if there was a timer where she could push a button and 30 seconds later it would issue a single "beep".
I could easily whip up such a circuit, but I can't make it very small and in an "esthetic" housing.
Does such a device exist for purchase?
Thanks! ...Jim Thompson