My projects with NE555

20 Aug 2022

Probably one of the most well-known integrated circuits, along with others such as UA741, CD4017, LM324 and so on, the NE555 timer is a versatile circuit component, relatively easy to use and configure in its monostable, astable and so on working modes. Although this NE555 timer was developed in the past, today it is an integrated piece in the circuits created especially by beginners in electronics, hobbyists.
Like many others, I tried to make some circuits with the NE555 timer, a circuit to simulate pulse control of an LED, DC motor or other things, and a circuit that turns on an LED when the light intensity in the room is low. In this case, the NE555 timer must be configured in astable mode using a 2N3904 NPN transistor, two 10k and 330R resistors and a 47-100uF capacitor. The part that deals with light intensity includes an LDR and a resistor, together forming a resistive divider whose output enters the base of a bipolar transistor. I have to adjust some values of the parts in the circuit, and change the LED.

Video demo here: https://drive.google.com/file/d/1H-JUqgaCDNc66JtteRoaUsB7O1-WUUi7/view?usp=sharing

Another circuit consists of feeding a dc motor in pulses. The circuit is designed based on the NE555, used as an oscillator, the frequency of the pulses delivered at its output can vary according to the user's wishes, by changing the values of the resistors and capacitors in the circuit. The assembly acts as a speed regulator, with the help of the potentiometer to ensure the adjustment of a desired fixed speed for the motor. I tested it on some LEDs powered at 12V, I mounted a multi-turn potentiometer and the effect is visibly very slow, I have to look for a more suitable potentiometer, a normal one, and 2-pin screw terminal blocks. .

Video demo here: https://drive.google.com/file/d/1NoUoD6ZD1WJUjL42NmuD2rcCEmODpvCL/view?usp=sharing