Time Delay Relay,延时继电器
关键字:Time Delay Relay
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
Parts: C1 See Notes R1 See Notes D1 1N914 Diode U1 4011 CMOS NAND Gate IC K1 6V Relay S1 Normally Open Push Button Switch MISC Board, Wire, Socket For U1
Notes: 1. Email jawaharlal@excite.com with comments, questions, etc. 2. 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. 3. S1 may be replaced with an NPN transistor so the circuit can be triggered by a computer, other circuits, etc. 4. 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.
Author: Email: jawaharlal@excite.com
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