Timer with 555

Published:2013/1/16 1:47:00 Author:muriel | Keyword: Timer, 555 | From:SeekIC

This circuit can be used to activate a relay for two or three minutes. Pressing the switch the relay will be activated. Changing the 1M resistor with a variable resistor you can vary the time. The 0.01 capacitor is important because it prevents any false triggering. The circuit will work OK with 6 Volts without any modification. If you want to use 9 or 12 Volts, you need to change the relay with a 9V or 12V relay. Using this circuit with 120 VAC is not recommended, however, using the right parts and the right isolation, will be not a problem. The aplications for this circuit may vary, for example: Bouce-free switch, A three-minutes light to walk thru a dark area, A timer-activated faucet to save water, etc. Any project that needs only a few minutes of power will be perfect for this circuit. Ever if you have an old microwave with the broken electronic control, you can replace it with this timer (using the right hi-current relay).



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