![KIT, TIMER 1 HOUR CYCLE CK157 KIT, TIMER 1 HOUR CYCLE CK157](https://leeselectronic.com/22188-large_default/kit-timer-1-hour-cycle-ck157.jpg)
![KIT, TIMER 1 HOUR CYCLE CK157 KIT, TIMER 1 HOUR CYCLE CK157](https://leeselectronic.com/22189-large_default/kit-timer-1-hour-cycle-ck157.jpg)
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This timer is a cyclic timer with a fixed total ON + OFF period of 1 minute, 30 minutes or 1 hour. Three on-board jumpers can be used to limit the total ON+OFF period to 1 minute, 30 minutes or 1 hour. You can then set the ON period of the cycle using the variable resistor. For example, if you set the variable resistor to 1/3 of its range, the ON period will be about 20 minutes and the OFF period will be about 40 minutes (assuming the jumper is set to the 1-hour mode).