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Power Failure And Resumption Alarm

This circuit gives audio-visual indication of the failure and resumption of mains power. The circuit is built around dual timer IC LM556. When mains...

Solar Bug

This Solar Bug circuit takes power from a small solar panel and then produces a sound in a buzzer momentarily when the relaxation oscillator...

Accurate Foot-Switch

Certain industrial controls require accurate switching operations. For example, in case of a foot-switch for precise drilling work, even a small error in switching...

Power-on Reminder with LED Lamp

Many a times equipment at workstations remain switched on unnoticed. In this situation, these may get damaged due to overheating. Here is an add-on...

Multiple Applications of High-Power LEDs

Nowadays, high-power light-emitting diodes (LEDs) LXHLMW1C are available in the market. These white LEDs contain indium-gallium-nitrogen (InGaN). The LEDs’ emitting capacity is 20 candela...

Pencell Charge Indicator

Small-size AA cells and button cells used in electronic devices providing a terminal voltage of 1.5V are normally rated at 500 mAh. As the...

Audio Amplifier for Personal Stereo

In the output stages of most broadcast receivers and some amplifiers, there is a limit up to which maximum power can be developed without...

Highway Alert Signal Lamp

Here is a signal lamp for safe highway driving. The lamp automatically emits brilliant tricolour light when a vehicle approaches the rear side of...

Doorbell-Controlled Porchlight

This add-on circuit automatically turns on your porchlight when your doorbell rings, so you can see the person ringing the doorbell at the doorstep....

Intercom with Musical Ringtone

Here’s a low-cost two-way intercom circuit with musical ringtone that can be made using readily available components (see Fig. 1). Melody generator IC UM66 (IC1)...

Ultra-Bright LED Lamp

This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc....

Electronic Scoring Game

You can play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along...

Telephone Line Based Audio Muting and Light-on Circuit

Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus...
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