Buffer and Driver for Square-Wave Signals
Most square-wave generators have a single output that doesn’t have a high driving capability/slew rate or is not adjustable in the required amplitude range....
Programmable Industrial On-Off Timer With RF Remote
In most of the modern manufacturing and processing industries, there is complete industrial automation through sophisticated hardware and software like programmable logic controller (PLC),...
Getting started with Raspberry Pi
SEPTEMBER 2012: The Raspberry Pi (Fig. 1) is powered by a BCM2835 system-on-chip from Broadcom that contains an ARM processor (running at 700 MHz)...
Anti-Petrol Theft Alarm
Petrol/diesel theft of parked vehicles is quite common. Presented here is an audio-visual anti-petrol theft alarm circuit that can help prevent this crime. The...
Multifunction Ozone Generator
Ozone is a triatomic form of oxygen that is highly unstable and as such cannot be stored. It finds various applications in our daily...
A Simple Musical Light
The circuits for musical lights available in the market are highly expensive and based on microcontrollers. Also, their programming is very difficult. Here is...
Simple Crystal Tester
Here is a simple circuit that can be used to test a crystal before using it in a circuit. The circuit is built around...
Microcontroller-Based DC Motor Controller
Motion control plays a vital role in industrial automation. Manufacturing plants in industries like chemical, pharmaceutical, plastic and textile, all require motion control. And...
Versatile Object Counter
Object counters are extensively used in industries. Normally, these are made of expensive microcontrollers or processors. For small-scale industries, this means a lot of...
Relay Actuating Circuit with Millivolt Sensitivity
Common electromagnetic relays with coil voltage of 5V, 6V or 12V can operate power circuits in the range of 250 to 300 volts and...
Sensor-Based Door Lock
The door lock controller given here is a simple electronic switching circuit realised using a low-cost unipolar Hall effect sensor IC MH183. This CMOS...
Analogue Wattmeter
Unlike current or voltage measurement, the measurement of power is somewhat inconvenient as power is the product of voltage (V) and current (I) flowing...
Audible Logic Probe
Using a conventional logic probe, it is difficult to determine what is happening at a point in a circuit above 50 Hz. The human...
Simple Parking Counter
This simple circuit can be used to count the number of cars entering a parking lot.
The circuit is built around comparator LM311 (IC1), timer...
Intercom Using LM386
Keep in touch with your family members from one room to another and also from outside areas such as the garage, using this intercom...
SERVO MOTOR TESTER
When using a servo motor in a project, if the servo motor does not respond as per the input, how to make sure that...
Home Appliances Control Using Telephone
Using this circuit, you can control up to seven electrical appliances through a telephone. The circuit can switch on/off the appliances in two modes....
1Hz Precision Clock Timer
This timer makes an LED flash once every second along with a beep. The timing circuit uses a quartz crystal available in digital watches...