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As we know a relay is an electro-mechanical device which is operated with an electrical signal to move its internal contacts through electromagnetic pull and these contacts in turn is used to toggle a heavier load working with mains AC or higher voltages.
When a relay is operated with timed delay it becomes a delay relay switch.
In this category we learn how to build many such small and big timer circuits which could be integrated with relay for creating delay relay switches.
Under this category you will find a substantial number of small and big timer circuits as per your specific needs which could be combined with a relay to constitute a timer based relay switch.
In this post we are going to make a digital socket timer using Arduino whose countdown time can be witnessed via 16 x 2 LCD display. Introduction The proposed circuit is general purpose timer with display and few buttons for setting the time. Once the time is set output goes high and starts countdown the … Read moreSteps to Build a LCD Socket Timer Circuit
A simple cell phone charger with timer circuit is presented in the following article, which could be used for charging a given Mobile phone for a specified predetermined length of time. The idea was requested by Mr. Saad. Circuit Objectives and Requirements Could you design me this charger circuit ? Input 230V 60 Hz, and the … Read moreTimer Based Cell Phone Charger Circuit
In this post we learn how to make a timer circuit for fitness, or gym workout application. The idea was requested by Mr. Jan. Circuit Objectives and Requirements I need a circuit diagram for a timer which is used in a fitness gym. It consists out of 5 x incandescent (5 channels) 220V colored bulbs … Read moreTimer Controlled Fitness Gym Application Circuit
The post discusses a simple food warmer lamp timer circuit for restaurants and hotels which can be used for automatically switching OFF the lamps after a predetermined time whenever the food under the lamps are idle or in the absence of an interaction under the lamps, thus saving precious electricity. The idea was requested by … Read moreAutomatic Food Warmer Lamp for Hotels
The post details a timer circuit for submersible borewell pumpset which alternately switches the pumpset ON/OFF at a predetermined rate in order to allow the ground water sufficient time to restore at regular intervals and to ensure a consistent water supply to the attached overhead tank. The idea was requested by Mr. Siva. Circuit Objectives … Read moreTimer Controlled Submersible Pumpset Circuit
The post talks about an IC 4060 timer circuit problem implemented in a coffee wending machine, in which the circuit simply stops working each time its stipulated delay period is lapsed, even after a complete power switch OFF and ON. The question was presented by Mr. Kenndy and was solved through the following email discussion: … Read moreIC 4060 Timer Latching Problem [Solved]