Sequential Device Control using TV Remote Control
This circuit lets you switch on and switch off up to nine devices sequentially from your TV remote control.
The circuit consists of an IR...
WEEKLY REMINDER
This circuit reminds you of all the important tasks that are due on a specific day every week. So be it returning your library...
Standby Power-Loss Preventer
Electronic devices consume some power even in the standby mode, i.e., when they have been switched off using a remote handset but not the...
HDD Selector Switch
Using the switch-mode power supply (SMPS) of your personal computer, this add-on circuit lets you switch between three hard disk drives (HDDs) and also...
ELECTRONIC CANDLES
Here is a simple circuit that can produce the effect of candle light in a normal electric bulb. A candle light, as we all...
TRANSISTORISED LOGIC PROBE FOR TTL
A logic probe is a handheld pen-like probe used for analysing and troubleshooting the logical states '0' or '1' of a digital circuit. While...
INVERTER FOR SOLDERING IRON
Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) in the absence of mains supply. It uses...
MULTI-SWITCH DOORBELL WITH INDICATORS
Here’s the circuit of a multi-switch input musical doorbell (shown in Fig.1). The circuit is built around the popular and less expensive quad D-latch...
Peak Hour Timer
Electrical appliances like refrigerators and air-conditioners consume heavy current if the line voltage drops during the peak hours between 6 pm and 9 pm....
GLOW PLUG CONTROLLER
In diesel engines, the air in the cylinders is not hot enough to ignite the fuel under cold conditions. Therefore each cylinder of these...
Cordless Multi-Door Alarm
Thwart the attempt of burglary by detecting intrusion with this alarm circuit. Each door is protected by a separate circuit built around an independent...
DIY Motorbike Anti-Theft Alarm Using Simple Components
This simple-to-build alarm can be fitted in bikes to protect them from being stolen. The tiny circuit can be hidden anywhere, without any complicated...
Automatic Wash Basin Mirror Lamp Controller
In restaurants, auditoria and even homes, many a times we forget to switch off the wash basin mirror lamp after use. The circuit given...
Circuit for UPS to Hybernate PC
Most of the low-power UPS systems available in the market do not have the facility to shut down the PC before they turn off...
DIY Reminder Circuit with Buzzer and LED
This easy-to-build electronic alarm will remind you of an impotant task after a preset time. It is particularly useful for housewives and busy professionals....
DIY LED Chaser Circuit with Tune Generator Using NE555
IC1 (NE555) is used here as a clock generator. It is configured as an astable multivibrator whose frequency can be adjusted with the help...
SHORT WAVE TRANSMITTER
This transmitter circuit operates in shortwave HF band (6 MHz to15 MHz), and can be used for shortrange communication and for educational purposes.
The circuit...
Protect Your Appliances with This Over/Under Voltage Cut-Out Circuit
This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages.
The...