Hello ! English is not my first language so sorry if i make mistakes. I was wondering about the kind of clock inside washing machines when you set a program for later, mine allows me to chose between a delay of 3h, 6h and 9h by pushing a switch and there’s no screen. What’s the most efficient way to build it ?
In: Engineering
Just a digital clock usually.
An oscillator with a known frequency and a counter circuit.
If you want to build one yourself youw can make an analogue clock from some capacitors, resistors and OP amplifiers. For example you can build an integrator that builds up current over 9 hours and 3 comparators that compare it to 1/3, 2/3 and 1 times the supply voltage. And then a reset/selector switch
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