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Most commercial torchlights use three AA or AAA cells connected in series, which produces 4.5V to drive white LEDs using a current-limiting resistor. These flashlights do not drive the LEDs efficiently due to lack of a current-control circuit. Presented...
This article describes a method for making an ESP8266-12E/F module programmer and also discusses the support circuitry required for real-time applications. NodeMCU board is a development kit that consists of ESP8266 Wi-Fi-enabled chip and many other support circuitries. It is...
The minuscule LED night marker presented here is an automatic light beacon that wakes up at night, or when there is not enough ambient light in its environment. Anyone active in the dark (walking, riding, swimming, etc) can utilise...
Use of audio amplifiers is increasing day by day. This project deals with the transmission of the audio signal wirelessly and amplification of the received signal using VTF-108 Bluetooth module and audio amplifier IC TA8210AH. Bluetooth module can connect to...
Here is a circuit meant for babies for generating various light patterns on eight LEDs. Lights pattern generator circuits available in the market are fitted with toys, and are used by babies for play and entertainment. These toys are...
Fastest finger first technique is used in quiz shows (with rapid fire rounds) to find the order in which participants press the buzzer (to give an answer to the question). This project is designed for four players. For real-time...
This project turns on and turns off a laser LED after every second. It can also monitor its own supply voltage level. The circuit can be extended for use as an audio-visual alarm system for security applications. Keyes KY-008 laser...
Monitoring circuits in battery chargers, water-level indicators, etc use LEDs to indicate the status of certain conditions. Presented here is a multiple status indicator circuit that uses a single RGB LED for seven different indications. Circuit and working for Multiple...