Thursday, December 2, 2021
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When power-supply polarities of an electronic device are accidentally interchanged, the device runs the risk of damage. The danger can be avoided by adding this tiny circuit to the power supply section of the device. This power supply reversal...
This music operated lighting effect generator comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets glow one after another depending on the intensity of the audio signal. No electrical connection is to be...
In this circuit, IC CD4017 has been used to program a bicolour LED indicator in 10 different modes which can be selected with a single push-button switch.
This door opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small unit including reed switch on each door frame and fix a magnet on the moving...
This simple, low-cost night lamp automatically activates at night and deactivates in the daytime. It incorporates battery charging circuit with protection against over-charging and deep-discharge.
The electronic bicycle turn indicator unit described here uses low-cost components and is a good substitute to many commercially available versions. It works in an extremely different manner and is convenient to operate. Bicycle turn indicator circuit The circuit works off...
Here’s a digital frequency comparator for oscillators that indicates the result through a 7-segment display and a light-emitting diode (LED). When the frequency count of an oscillator is below ‘8,’ the corresponding LED remains turned off. As soon as...
A keychain light with white LED comes in handy to help you at your front door or search your valuables in the dark. The intensity of white LED is 4000 to 5600 mcd (millicandela) at forward voltage of 3.6V...
LEDs are becoming increasingly popular in many lighting applications. White LEDs are now common in torches. Here’s a simple and economical LED torch that operates off two 1.5V cells. Why go for LEDs? LEDs are ideal for use in applications that...
In an enlightening customer story, Philips on its website shares the experience of State Bank of India, Agra Branch, which recently switched to LED lighting. The bank was looking for a lighting solution that would decrease energy consumption and...