https://w.electrodragon.com/w/index.php?action=history&feed=atom&title=NE555 2026-07-22T11:32:55Z Revision history for this page on the wiki MediaWiki 1.37.2 https://w.electrodragon.com/w/index.php?title=NE555&diff=31870&oldid=prev 2021-07-28T14:16:59Z

<p></p> <p><b>New page</b></p><div>== Schematic ==<br /> &lt;gallery&gt;<br /> File:NE555 pulse module schematic.JPG | NE555 Pulse Signal Generator<br /> File:Ne555_flashing_leds.JPG | Flash alarm schematic, left twice, right twice flashing, all once flashing<br /> File:Ne555 pulse alarm light.jpg | manual flashing alarm<br /> File:LED_sequence_light.jpg | LED sequence light<br /> &lt;/gallery&gt;<br /> <br /> == Projects ==<br /> * Delay Relay, Active time = 1.1RC = e.g 47UF * 500K = 1.1 * 500,000 * 0.000047 = 25.85<br /> in which <br /> Capacitor 47UF connect to Threshold<br /> Resistor 500K connect to Trigger<br /> === Flashing Blue Red LED Alarm ===<br /> <br /> * Module combines of NE555 and [[CD4017]], when the 1st, 3rd, 5th pulse comming, blue LED flashing, and when 2nd, 4th, 6th pulse comming, red LED flashing. When 11st, 13st, 15th pulse comming, blue LED flashing, again and again. Then it looks like alarm light.<br /> * Change trim pot can change frequency.<br /> <br /> <br /> == Delay Relay ==<br /> Calculation T=1.1*500000*0.000047=25.85 seconds maximium<br /> 1.1 constant value<br /> 500 000 = 500K = trim pot maximium resistance value<br /> 0.000 047 = 47UF = fixed on board capacitor<br /> Buttons:<br /> * Re-count (top) = re-count time of delay <br /> * Reset = reset relay status<br /> <br /> == Calculator ==<br /> * https://kechuang.org/tools/3/tool/ne555.html<br /> * http://www.eeworld.com.cn/tools/555dingshiqipinlv.html<br /> <br /> [[category:Signal Generator]]</div>

Chao