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How to build Time Delay Relay II

2018-11-15 04:03  
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When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to use.

Circuit diagram

Time Delay Relay II-Circuit diagram


C1 See NotesR1 See NotesD1 1N914 DiodeU1 4011 CMOS NAND Gate ICK1 6V RelayS1 Normally Open Push Button SwitchMISC Board, Wire, Socket For U1


Email jawaharlal@excite.com with comments, questions, etc.To calculate the time delay, use the equation R1 * C1 * 0.85=T, where R1 is the value of R1 in Ohms, C1 is the value of C1 in uF, and T is the time delay in seconds.S1 may be replaced with an NPN transistor so the circuit can be triggered by a computer, other circuits, etc.Most any 6V relay will work for K1. If you use a large relay, you my need to add a transistor to the output of the circuit in order to drive the larger load.

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