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Cmos 4017 Sequential Timer
Cmos 4017 Sequential Timer
August 9, 2010

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 continuosly. The individual events within the sequence - can be made to... [more]

Two Cmos Based 24-Hour Timers
Two Cmos Based 24-Hour Timers
August 9, 2010

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... [more]

A Regularly Repeating Interval Timer
A Regularly Repeating Interval Timer
August 9, 2010

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... [more]

Repeating Interval Timer No2
Repeating Interval Timer No2
August 9, 2010

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. [more]

Repeating Timer No3
Repeating Timer No3
August 8, 2010

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... [more]

Repeating Timer No4
Repeating Timer No4
August 8, 2010

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. [more]

Repeating Timer No5
Repeating Timer No5
August 8, 2010

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 The light dependent resistor has been replaced by a temperature dependent resistor or thermistor.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. [more]

Repeating Timer No6
Repeating Timer No6
August 8, 2010

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. [more]

Relay Timer switch
Relay Timer switch
August 8, 2010

Relay Timer switch [more]

Wide Range Timer
Wide Range Timer
August 8, 2010

A wide range auto turn OFF timer covering 1 minute to 20 hours in three ranges [more]

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