[RedruM69] recently ran into a system with a dead Real Time Clock (RTC) module. These modules were used on computers and all sorts of other equipment, storing time, date, and 100 or so bytes of ...

He’s made a real-time-clock module controlled by a rubidium frequency standard, and since it also includes a GPS clock he can track local time dilation effects by comparing the two. Surplus ...

An on-board real-time clock is provided, that needs an external battery. 5V power is required at 5A and the module needs a heatsink (above left) As a design example, for prototyping, and to make a ...