Position: Index > Unclassified >

How to build Time Delay Relay II

2018-11-15 04:03  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

Description

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

Parts:

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

Notes:

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.







Reprinted Url Of This Article:
http://www.circuit-finder.com/categories/timer/426/time-delay-relay-ii