a dimmer project circuit | Next Electronics

This DC power supply controller is regulated by pulse width modulation (PWM), which is generated by a circuit utilizing timer IC2 7555 according to a specific duty cycle formula. The described DC power supply controller employs a timer IC, specifically the...

LED Flashlight Use Super capacitor Schematic Diagram

Tired of experimenting with capacitors? It's time to explore supercapacitors, which offer significant storage capabilities. This article provides instructions on building a small LED flashlight utilizing supercapacitors. A minimum voltage of 2 volts is necessary to illuminate the LED, as...

simple led voltmetercircuit

This circuit is designed as a simple LED bar graph voltmeter. Each operational amplifier in the LM339 quad package functions as a comparator, comparing the input voltage (Vin) to a series of fixed voltage levels that are proportional to the...

Triac-SCR-Thyristor

A center-tap 50Hz step-down transformer with two diodes is utilized to generate a series of positive sine pulses at 100Hz, which is applied to the base of Q6 through resistor R51. The 2N2646 is a unijunction transistor (UJT) housed in...

The Arduino Internet Gizmo

The Arduino Internet Gizmo is a USB, Arduino, and RFID device designed for web browsing. It operates by placing an RFID tag on the device, which reads the tag and transmits the tag number via USB to a program running...

Electric strike with Arduino circuitry

A fingerprint door lock system is being considered for implementation. The primary component is a fingerprint reader that, upon recognizing a valid fingerprint, will instruct an Arduino microcontroller to activate a locking mechanism for a predetermined duration. The locking mechanism...

Solar LED light schematic

Purchase a 1W white LED and utilize a mobile phone battery to create a small lamp. A lampshade can be made from a glass-like milky white plastic bottle. The LED emits light through a radiating plate, which has two leads...

lighting leds

For optimal lifespan, it is recommended to operate LEDs at 20-25 milliamps (mA). However, in certain LED flashlight conversions, including many commercial LED flashlights, the LEDs are often driven at 50-60 mA, which is twice the rated current. Testing has...

About a PWM power inverter

A few months ago, a search was conducted for an easy-to-build PWM inverter that does not require any PIC programming. The investigation led to a consideration of a 555 PWM amplifier circuit. The 555 timer IC is widely used in various...