September 2013 ~ Electronics Circuit, schematic, electronics project, free electronics project

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Monday, September 23, 2013

IC LM 555 as eazy and cheap TIMER

9:15 AM

Azq

1 comment

IC 555 most popular as multivibrator and can design as easy and cheap timer like this circuit. The TIME that you want as timer be calculate:

1.1R∗C

A relay timer circuit using the 555. On pressing the switch the relay is activated for a time determined by 1.1R∗C, where R∗ equals 100k plus the setting of the 470 kW variable and C is the capacitor value that has
been selected by the switch. Note the use of diodes to prevent latch-up and damage to the IC when the relay isswitched off.