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This article presents a method of constructing a hardware RTC (real-time clock) timer as a device based on TTL logic (transistor-transistor logic). The RTC timer provides functionalities such as measuring real-time clock, a chronometer function, and a start-stop button for pausing. The RTC timer is based on TTL counters and development bool logic to manage correct counting seconds, minutes, and hours. [ABSTRACT FROM AUTHOR]