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Ditulis Oleh : YK69 Elektro
Judul : Rangkaian Bell Pintu Rumah

Rangkaian Bell Pintu Rumah

This is a doorbell circuit use IC NE555.When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator (IC1). When the switch S1 pressed, IC1 is triggered at its pin 2 and output pin 3 goes high for a time period previously set by the values of POT R4 and POT R5.When the output of IC1 goes high it resets IC2 and it starts to oscillate to make a bell sound through the speaker.The IC2 is configured as an astable multivibrator whose oscillation frequency can be varied with the help of POT R5.By adjusting the values of R4 & R5, modifications on the tone are possible.

Skema rangkaian bell pintu

IC NE555 description

The NE555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA. The NE555 is available in plastic and ceramic minidip package and in a 8-lead micropackage and in metal can package version.

Lay out and diagram IC NE555

Pin connnections IC NE555

1 - GND
2 - Trigger
3 - Output
4 - Reset
5 - Control voltage
6 - Threshold
7 - Discharge
8 – VCC

Absolute maximum ratings
Supply Voltage: 18 V
Operating Free Air Temperature Range for NE555: 0 to 70 oC
Junction Temperature 150 oC
Storage Temperature Range –65 to 150 oC.
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