NE555 Timer IC is very popular and one of the commonly used component in electronics circuit. NE555 Timer IC is also called Ideal IC since it offers multiple features like multipurpose functionality, low power consumption, small size and durable. When we work on a particular project and it doesn’t work the way we wanted, before circuit we doubt on the IC used, if it is working or not. More or less, blaming IC is reasonable since IC is the combination of many more components or IC itself is a combination of circuit. Here is the simple but effective 555 timer IC tester circuit which checks IC NE555 whether it has fault or not.
Working of 555 Timer IC Tester
In the circuit IC NE555 itself is used as astable multivibrator mode. Switch SW1is pushed for power supplies which charge the capacitor C1 through resistor R1and variable resistor R 2 which trigger IC and high output is obtained from pin no. 3 which glows LED D2 (LED D1 off). Similarly when capacitor is discharged the output become low and LED D1 glows (LED D2 off). The on and off of LED in sequence is in practice until power supply, this mean there is no fault in IC. But if the LED doesn’t follow the ‘on and off’ pattern at regular intervals, then there is fault in IC.
PARTS LIST OF 555 TIMER IC TESTER
|Resistors (all ¼-watt, ± 5% Carbon)|
|R1= 1 KΩ|
R2 = 150 KΩ
R3, R4 = 330 Ω
|C1 = 10 µF/16 V|
|D1 and D2 = Green and Red LED Respectively|
|8 pin IC Base|
SW1 = Push to on switch