Wiring Material: led

Showing posts with label led. Show all posts

Sunday, September 21, 2014

Simple LED Torch

A common problem with small torches is the short life-span both of the batteries and the bulb. The average incandescent torch, for instance, consumes around 2 Watts. The LED Torch in Fig. 1 consumes just 24 mW, giving it more than 80 times longer service from 4 AA alkaline batteries (that is, up to one months continuous service). Although the torchs light output is modest, it is nonetheless quite sufficient to illuminate a pathway for walking.

Circuit Diagram :

Fig. 1 : Simple LED Torch Circuit Diagram

The LED Torch is based on a 7555 timer running in astable mode (do not use an ordinary 555). A white LED (Maplin order code NR73) produces 400 mcd light output, which, when focussed, can illuminate objects at 30 metres. Try Conrad Electronic for what appears to be a stronger white LED (order code 15 37 45-11). A convex lens with short focal length is placed in front of the LED to focus the beam. If banding occurs at the beams perimeter, use another very short focal length lens directly in front of the LED to smooth the beam.

If a different supply voltage is preferred, the value of resistor R3 is modified as follows:

9V - 470 Ohm
12V - 560 Ohm

See my "Wind-up Torch" feature article in the October 2000 edition of Everyday Practical Electronics for a completely battery-free go-everywhere torch.

Wednesday, September 10, 2014

Simple LED light Organ Wiring diagram Schematic

This is a Simple LED light Organ Circuit Diagram. This is a fun schema that can be at parties, for example. The four LEDs flash to the beat of the music. The light organ responds using a microphone to sound.T1 amplifies the signal from MIC. The sensitivity can be adjusted by P1. T4 controls the LEDs.

These are preferably LEDs with a high light intensity.MIC is a condenser microphone. The schema can be powered by a 9 V battery.

LED light Organ Circuit Diagram

The 4 Budget

This schema costs about € 6.15.

Parts List

R1 = 10 k
R2 = 330 K?
R3, R6, R13 = 100 k
R4, R8, R11, R14 = 47 Ω
R5, R9, R12 = 1.5 MΩ
R7, R10 = 47 k
P1 = 220 K?
C1, C2, C3 = 100 nF
C4 = 100 uF
D1-D4 = LED
T1, T2, T3 = BC547B
T4 = BC557B
MIC = microphone capsule

Monday, September 8, 2014

Constant LED Power Supply Wiring diagram Schematic

An LED is usually a series resistor needed to ensure that the LED does not get too much power. The disadvantage of such a resistor is that the current thus also changes by the LED and the brightness as the voltage changes.

This schema prevents that, by independent of the voltage, a constant current through the LED.The schema uses two transistors and two resistors. The schema can be connected to voltages of from 5 to 24 V.

Constant LED Power Supply Circuit Diagram

Saturday, August 16, 2014

LED Light Pen Wiring diagram Schematic

Physicians and repair engineers often use small light pens for visual examination purposes. Rugged and expensive as these pens may be, their weak point is the bulb, which is a ‘serviceable’ part. In practice, that nearly always equates to ‘expensive’ and / or ‘impossible to find’ when you need one.

LEDs have a much longer life than bulbs and the latest ultra bright white ones also offer higher energy-to-light conversion efficiency. On the down side, LEDs require a small electronic helper schema called ‘constant-current source’ to get the most out of them.

LED Light Pen Circuit Diagram
LED-Light-Pen-Circuit-Diagram

Here, T1 and R1 switch on the LED. R2 acts as a current sensor with T2 shunting off (most of) T1’s base bias current when the voltage developed across R2 exceeds about 0.65 V. The constant current through the white LED is calculated from

R2 = 0.65 / ILED
With some skill the complete schema can be built such that its size is equal to an AA battery. The four button cells take the place of the other AA battery that used to be inside the light pen. Link

Author: Myo Min – Copyright: Elektor

Thursday, August 14, 2014

First LED lamp that replaces a 100 watt incandescent

Already reached the market the first LED lamp that replaces 100 watt incandescent bulb, this was the announcement of Osram Sylvania. She becomes the first to do is replace the new lamp will join the existing line of Ultra LED 40, 60 and 75 watt (equivalent to incandescent powers), it consumes 20 watts and have a lifespan of 25,000 hours about 25 times more than incandescent bulbs.It has a CRI of 80, an illumination of 1,600 lumens and a warm white color temperature of 2700k. It also is adjustable and, of course, free of mercury and lead.

First LED lamp that replaces a 100 watt incandescent

Saturday, August 9, 2014

One IC Led Flasher circuit Wiring diagram

Most of people always send emails to Free Circuit Diagrams 4U asking simple Circuit diagrams. Here Im going to give you a very simple flasher schema diagram the specialty of this schema is we can operate this schema with 1.5 V power supply.And we have used only one IC for this schema that means you need to buy only three parts to build up this schema.Here we have used common IC3909.

Note :
# Build this schema on a PCB
# Dont supply over 1.5V