DP555 Time Delay Protection User Manual
Contents
1. Delay Protection User Manual Analog Metric www analogmetric com sales analogmetric com Copyright 2009 All Rights Reserved Delay Protection IEEE FEATURES Timing Adjustable relay switches from mili seconds to hours Time setting by varies RC value of the 555 Timer Built in low dropout voltage regulator LM1086 5 IC Wide range of DC Power supply 6 30V Maximum rating of Relay 120VAC 1A Applications Delay protection for speaker power supply etc PCB dimension 76 8mm W x 37 3mm L PCB thickness 2 5mm double layer 20z copper PROCEDURES Solder the components according to the schematic and BOM The timing constant delay time is set by the RC time constant that are the resistors R1 R2 R3 R4 R5 and R6 and C4 The higher the time constant the longer delay time will be resulted The relationship between the delay time ranged from micro seconds to few seconds is shown in the below figure www analogmetric com Page 2 Delay Protection IEEE By properly setting the RC value you can control the delay time of the relay EZZ AAA AAAA AK a 10 10 3 Output Pulse Duration s R 1kQ 0 001 0 01 0 1 1 10 100 C Capacitance uF 10 4 410 9 A T 1 1RC switch 3 Apply the power supply you will hear the click sound or LED light up when the relay are switched on after the predefined delay timing If you have any problems in assembly please contact us by e2. mail tech analogmetric com www analogmetric com Page 3
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