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Electronics Projects: Simple 12 Volt Day Night Switch – Circuit Schematic
Electronics Projects: Simple 12 Volt Day Night Switch
At times it`s really very annoying to see the street lights kept switched ON even during broad day light. The present circuit of an automatic night light can ve...
Traffic Light Project – Circuit Schematic
Traffic Light Project
This project operates red, amber and green LEDs in the correct sequence for a single UK traffic light. The time taken for the complete red - red & amber - green...
Random Flasher for 8 LEDs Project – Circuit Schematic
Random Flasher for 8 LEDs Project
This project flashes eight LEDs in an apparently random manner. It uses a 4026 combined counter and display driver IC which is designed for driving 7-segment LE...
led How can I effectively reduce the voltage needed to activate a transistor – Circuit Schematic
led How can I effectively reduce the voltage needed to activate a transistor
A circuit which basically connects the line out (audio output) of a music playing device to a set of LEDs (actually a huge strip of around 200 LEDs), so they fl...
atmel driving LEDs directly from microcontroller pins – Circuit Schematic
atmel driving LEDs directly from microcontroller pins
LED will turn on when PIO goes low - acting like GND - and current will be taken from power supply not from PIO like first method. So do I must take care of max...
Motion sensing LED Quantum Bits – Circuit Schematic
Motion sensing LED Quantum Bits
The circuit works like this: Normally the LED is powered dimly through R1 and R3. SW1 is the spring and wire based accelerometer I mentioned earlier. When SW1 i...
led How should I build this circuit – Circuit Schematic
led How should I build this circuit
The LED is 3V, and according "to the internet" (there was no manufactorer info on it) a blue LED usually supports up to 0. 03A. Since I have spare current from ...
Need Help: Wiring LEDs with 2 source voltages – Circuit Schematic
Need Help: Wiring LEDs with 2 source voltages
A series of LEDs I would like to have display at 2 brightness levels and am confused how to properly wire this. This is for additional running lights/brake ligh...
led strip Using a N-Mosfet to switch a common cathode ledstrip – Circuit Schematic
led strip Using a N-Mosfet to switch a common cathode ledstrip
As I am using a Common Cathode led-strip instead of a Common Anode one as used in the above link thus I came up with this `modified circuit`. Because my experie...
meter How to light an LED when a voltage hits a certain point – Circuit Schematic
meter How to light an LED when a voltage hits a certain point
A LED to indicate when a DC voltage reaches 5 volts or more. I don`t want the LED to be dim when it is at 4. 5 or anything. I just want it to be full bright at ...
arduino + optotriac based ac dimmer blinking severely – Circuit Schematic
arduino + optotriac based ac dimmer blinking severely
The light is simply blinking instead of dimming. So I used the following software to just glow the bulb without dimming: unsigned int i=1; void setup() { Serial...
mosfet Driving LED strip from microcontroller – Circuit Schematic
mosfet Driving LED strip from microcontroller
A strip of LEDs from a microcontroller using PWM to control the brightness. The strip I have takes about 1. 5A at 12V. I`m only familiar with purely low power d...
Building power/control interface for RGB LED strips – Circuit Schematic
Building power/control interface for RGB LED strips
Control RGB LED strips via a USB or ethernet interface. These strips consume a lot of power and the mass produced controllers suck. I would also like independen...
voltage How can I make LEDs light up equally – Circuit Schematic
voltage How can I make LEDs light up equally
There are three switches that represent "binary number", and according to that switches` combination, number of lit LEDs change to represent that binary number....
Driving 72 leds with 555 timer – Circuit Schematic
Driving 72 leds with 555 timer
Make a circuit with a 555 timer to run 72 LEDs all at the same time. I have already made a circuit, but am not sure If it will work safe and long or not. I am p...
arduino leds in parallel switched with NPN transistors – Circuit Schematic
arduino leds in parallel switched with NPN transistors
Just a nitpick, you don`t have the Leds in Parallel with the transistor. If you did, the leds would be on when the transistor is off. You have them in parallel ...
led Calculate expected voltage around a resistor – Circuit Schematic
led Calculate expected voltage around a resistor
It can`t be 0 volts, since the current does not freely move around, due to the resistor; resulting in one side being more negatively charged, and the other more...
voltage Serial and parallel circuits and power – Circuit Schematic
voltage Serial and parallel circuits and power
12V of power, and wanted to power LEDs with a forward voltage of 2V, could I only power 6 of them Would I connect the cathode of one to the anode of the next, c...
Switching intensity of LEDs – Circuit Schematic
Switching intensity of LEDs
I built this circuit and for some reason it works. FYI, the diodes are red 5mm LED`s, the transistor is 3904 NPN, and the resistors are what are shown in the sc...
ac TRIAC dimmer circuit design help (resistive load) – Circuit Schematic
ac TRIAC dimmer circuit design help (resistive load)
Making a light-dimming control system for a 240V heat lamp dissipating around 250W. I need to adjust the heat output on the lamp by control from a microprocesso...