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Intermediate Projects

Timer From Old Quartz Clock

You can build an accurate, low-cost timer from the circuit of an old quartz clock. This timer has a time duration of up to...

MOBILE ELECTRONIC WORKBENCH

Typically, implementing and testing even a small circuit requires an elaborate setup that includes breadboards, a dual DC power supply, hookup wires, ICs and...

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...
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