U1 is a 3817 integrated circuit. It has the ability to direct drive monitors can display 12h or 24h, you can sound alarm on a regular basis, on time and automatically turn on the radio. Light-emitting diode display is FND500 input frequency can be 50H or 60Hz. U2 is the 7800 series of regulator, and its rated power can be used to meet the requirements of the radio. Users can select the length of time the radio broadcast (which is a length of 59min) then Q3 will output a low, auto turn off the radio. When the alarm comparator when the investigation is to issue a sound alarm clock, there is alarm tone signal output.