Digital Countdown Timer Circuit

The KD series repeat cycle timer produces an output which alternates between an energized and deenergized state at a repetitive rate. The first cycle begins when input voltage is applied to the timer. During this period the output is deenergized. At the end of the first delay or off period, the output energizes and the second or on period begins. When the second delay period ends, the output deenergizes and the first period repeats. This onoff sequence will continuously repeat while input voltage is present. When input voltage is removed, the output deenergizes and the timer resets.
The KD5 Series repeat cycle timer provides equal off and on times, controlled by a single timing resistor or potentiometer. The KD6 Series produces two independent on and off times, controlled by two separate resistors or potentiometers.