Cmos 4017 Sequential Timer
This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuously. The individual events within the sequence - can be made to repeat and/or overlap. The accompanying Support Material
includes a detailed description of how the Cmos 4017 works.
Two Cmos Based 24-Hour Timers
A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the timer is running; and the second uses less power after the timer stops. Pick the one that best suits your application.
A Regularly Repeating Interval Timer
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days and beyond.
Repeating Interval Timer No.2
This is a simpler repeating timer circuit. It uses just one Cmos IC - wired as an asymmetric oscillator. The length of time the relay remains energized - and the length of time it remains de-energized - are set independently.
Repeating Timer No.3
This circuit is very similar to Repeating Interval Timer No.2
. However - the addition of a light dependent resistor means that the operation of this timer can be limited to the daylight hours. A variable resistor (preset) lets you choose the level of darkness at which the timer will cease to function.
Repeating Timer No.4
This circuit is the opposite of Repeating Timer No.3
. Its operation can be limited to the hours of darkness. Again - the variable resistor (preset) lets you choose the level of darkness at which the timer will begin to function.
Repeating Timer No.5
This circuit is a temperature controlled version of Repeating Timer No.3
. The light dependent resistor has been replaced by a temperature dependent resistor or thermistor. And a small preset potentiometer lets you choose the temperature above which the timer will operate.
Repeating Timer No.6
This circuit is the opposite of Repeating Timer No.5
. It will only begin to operate if the temperature falls below the preset level. Again - the variable resistor (preset) lets you choose the temperature below which the timer will function.
Repeating Timer No.7
This timer is based on a simple Cmos 4001 Monostable Circuit
. The length of the ON period - and the length of the OFF period - can be set independently. With the right value timing components - periods of up to an hour or more are available.
Repeating Timer No.8
This circuit has an adjustable output time of up to one-hour. And it can be set to repeat at intervals of up to 24-hours and beyond. It's a single IC version of my first - Cmos 4060 based - Repeating Timer
Repeating Timer No.9
This circuit has two independently adjustable 24-hour timers. There's a relay-timer that will energize the relay for up to 24-hours. And there's a repeat-timer that will restart the relay-timer - at regular intervals of up to 24-hours. It's a more versatile version of my first Repeating Timer