Running LEDs

Posted on Feb 4, 2014

This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actually set up as an astable multivibrator whose frequency could be altered using the support of potensiometer VR1. The clock pulses received from IC1 are fed to. This is the sound generator wh

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ich will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to generate sound frequency. How the circuit work: The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz. You can easily activate the LED from home electrical power line with this circuit diagram. You just need to add a nonpolar capacitor and a 1Kohm / 1W metal oxide resistor to activate the LEDs from home power line with serial connection. Note: Change the capacitor value from 0. 47uf/250V to become 0. 22uF/400V for 240VAC power. This circuit is a circuit which will provide output indicator of the temperature around the circuit. The indicator is just 2 pieces LEDs (D1 and D2) which indicates the heat of above 80 degrees Celsius and below 80 degrees Celsius. A well-known IC LM35 is chosen to be the temperature sensor in this circuit. Output. The following diagram is the Clock Generator circuit diagram which build based on NAND Gate logic IC. You may use IC 7400 or 4011 for this circuit. The 7400 is a TTL type, while 4011 is CMOS type. IC 4011 is cheaper than 7400 but the 7400 is faster than 4011. Circuit Notes: Excellent clock.

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