working principle of sine wave dimmers
#sine wave
#dimmer
#light control
#AC dimming
#phase control
#LED
#lamp
#lighting
#power electronics
#waveform
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Switching intensity of LEDs
A circuit has been constructed that functions unexpectedly. The circuit utilizes red 5mm LEDs as diodes, a 3904 NPN transistor, and resistors as indicated in the schematic. Logically, pressing the push button normally open (PBNO) should result in the destruction...
LED Chaser
General There are many 9V chaser circuits that seem to waste about 7V when driving LEDs that are only about 2V. This project is unique, because it uses only two inexpensive alkaline battery cells totaling 3V for power. Since most...
Christmas light circuit
The chart illustrates a Christmas lights circuit that employs a simple and cost-effective CD4069 CMOS hex inverter to control four separate circuits, each consisting of 50 light-emitting diodes (LEDs), totaling 200 LEDs. The circuit is powered directly by a 220V...
LED Flasher Using Transistor
This simple LED flasher circuit will alternately turn ON and OFF two LEDs. The first LED will illuminate when the second LED is OFF for a certain duration, and then the process will repeat.
The LED flasher circuit operates using a...
Three Flashing LED Doorbells For The Hearing Impaired
When the push switch is activated, the buzzer sounds, and the LEDs start to flash. For the hearing members of the household, the buzzer functions as a standard doorbell, providing reassurance to the visitor that the doorbell is operational. Upon...
Pathway Lighting with LEDs
Simple pathway lighting that provides illumination for the path at night. Extension for the solar garden light. The toroid is bifilar wound.
The described circuit involves a solar-powered pathway lighting system designed to illuminate walkways during nighttime. This system utilizes...
Mains Voltage Indicator with a LED
A need exists for a 220V AC line light display or main voltage monitor due to frequent electrical issues in a home.
To create a 220V AC line light display or voltage monitor, a circuit can be designed using a combination...
LED Flasher IIV
This is a simple design of a single flashlight. This small circuit is within a half hour to build. The circuit operates from 4.5 to 12 V. Of course it is possible other than to drive an LED. More: R1,...
Pocket LED Light
This is a pocket-sized LED flashlight operating with only one AAA battery. However, the super high luminosity LEDs (blue, green, or white) require at least 3.5 volts of forward voltage. This flashlight is boosting input voltage up to the operating...