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Time Delay Relay
延时继电器

时间:2009-10-30 22:00:03 来源:互联网 作者:不详 编辑: 【关闭


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
time delay relay
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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