Author - Abhay Bajpai


IR Remote Control for Home Appliances

IR Remote Control for controlling home appliances can be easily made using Decade Counter CD4017, 555 Timer and TSOP1738 infrared receiver. By using this circuit you can easily control your home appliances using your TV, DVD Player remote control or using a remote control circuit described here. Remote Control Receiver Circuit Diagram 2nd and 1st pins of TSOP1738 are used to give power, Vcc and Gnd respectively. 100Ω resistor and 33μF capacitor is to suppress power supply disturbances. When IR rays at [...]

Solar Tracker

Solar Tracker system Using LM358

We all know that a Solar Panel can be used to convert light energy to electrical energy. The amount of converted energy depends on the amount of light falling on the Panel. Generally Solar Panels are stationary devices which is fixed at a position. The produced electrical energy can be increased if we move the solar panel as the movement of the Sun. Here is a simple low cost Solar Tracker circuit which automatically moves the solar panel in [...]

Line Follower Robot – without using Microcontroller

After a long time I am presenting my new project Line Follower Robot without using Microcontroller. It is a simple circuit with a LM358 op-amp and is able to operate from 9v to 12V. The LM358 contains two op amps which are wired as comparators. Thus when the voltage at the non-inverting terminal (+) is higher than inverting terminal (-) its output will be high and when the voltage at the inverting terminal (-) is higher than non-inverting terminal (+) the output will be [...]

Simple Water Level Indicator

We have already posted about a Water Level Indicator and Controller using PIC Microcontroller. Today I am presenting a very useful, very cheap and very simple circuit using transistors for beginners in the field of electronics. This simple circuit can indicate the level of water in your tank using LEDs. Circuit Diagram The connections and arrangements are made as shown in the figure above. The +9V is supplied to water using a metal contact.  In this circuit all the transistors are working [...]

Automatic Garden Light Controlling System

Just like my previous circuit using LM358 this is also very cheap,also under 100 rupees. This is a circuit for controlling the street lights,garden lights,automatically. You don't need to turn it on and turn it off again and again,  just turn on the circuit once and forget, it will automatically manage itself by sensing the available brightness in the garden or street. Circuit Diagram Working In this circuit the IC LM358 is working as a comparator. The transistor BC548 is wired as a switch to [...]

Laser Security System

Laser Security System

Here is a simple and cheap Laser Based Security System, which costs below Rs. 100. It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered when the Laser beam falls on the LDR interrupts, which sounds the buzzer connected to it. This can be used to protect your valuable items, money, room etc.. By using different mirror arrangements you can form different security systems. This can also be used to protect more than one objects by suitably [...]