A basic digital watch , assuming it starts from cold at 00:00 , 01 Jan 1981 or whatever . And a latch to keep the power to watch going . Another watch and another latch set by the first latch. Then subtruct the hours and mins from the reading time
An AC hour meter should work. It would be connected across the switched AC line where goes to device A1. They cost about $10US on ebay:
This one displays up to 99999.9 hours then cycles back to 0.
John
An analog clock, either battery or AC, plus a DPST switch. When the switch turns A1 on, it turns the clock off, thus indicating when A1 was turned on.
I need to record the time a device (say A1) is switched on (nice if it records the time the device is switched off).
I suppose that I need to wire the power cable through this device and from this device connect to A1.
Is there any such device ? Or any other method of doing this ? (the device A1 is at home).
Thanks.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.