Loublet Schematic

Showing posts with label led. Show all posts

Thursday, November 20, 2014

Flip Flop Led Circuit

Flip Flop LED

Flip flop circuit is a series of free runing multivibrator given the burden of LEDs on each side of the transition changes its output signal. Flip flop circuit with LEDs is quite simple, that is prepared with 2 units and 2 units of 2N3904 transistor circuit tank circuit composed by the RC circuit.

LED indicators signal a change that is placed on each side of the flip flop will be lit in turn by the fire and extinguished the same as the charge and discharge capacitor. Flip flop circuit is quite simple as shown in the picture below.

Flip Flop LED series

The working principle is the flip flop over when the series voltage source is given then the 10uF capacitor will be charged through R 470 and the LED will then be forwarded to triger the transistor base so that the transistor will turn ON and LEDs. this occurs alternately on each side, so that the LED light will illuminate in turn as well.

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Friday, November 14, 2014

IC 74hc14 Arrow led indicator circuit with explanation

This arrow led indicator electronic project can be used in some dark places to show the directions . You can use to indicate direction just an illuminated arrow or a flashing light , but is much nicer if the light moves in the correct direction.
This arrow led indicator is based on 74HC14 circuit and some LEDs which are used to show the way .

For this arrow led indicator we need six series of three LEDs arranged in the shape of arrows and are connected to the outputs . Each time the lit arrows move over by one column so it appears that the arrows run from right to left.
If we want to change the speed of the moving light it’s need to change the value of C1 to C3 or R1 to R3 ( a lower value for this components decrease the time of moving lights) .
If we want a longer arrow we can mount in parallel with existing columns another columns .
For power supply we can use batteries or 6V regulated power supply .

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Friday, October 31, 2014

Alarm LED Light Circuit

This circuit yearn for act the performance of the equipment,otherwise Check the fuse here the circuit.The circuit is diminutive and the power supply voltage of all kinds. It demonstrate with LED, 2-color in individual. Which is cathode universal kind,the anode has two separate terminals. If the circuit is functioning well LED, it revealed in wet behind the ears colour.The display is red, as the fuse into the circuit is damaged.The resistor R1 limits the current to gush through the LED is roughly 2 mA.This is an adequate amount to produce the LED light.If it lowers the R1 down, the LED light up.

Alarm LED Light Circuit Diagram

In the conventional setup of the circuit and The fuse is not damaged. The zener diode to prevent the green and red LED illumination up in chorus.Zener diode prevents the LED is simple and red illumination all together.

The piercing efficiency LED, as soon as connected trendy like. The red LED uses high-pressure, so with the intention of single green LED illumination up only. Diodes D3 and D4 wish prevent dodgy instead of the LED. While the semi cycle downbeat voltage of the alternating current voltage.However, if the DC supply voltage.I act not retain to manage diode protection.

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Wednesday, October 29, 2014

Flashing LED Battery status Indicator Circuit Diagram

Signals when an on-circuit battery is exhausted 5V to 12V operating voltage A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the users attention, signaling that the circuit is running, so it will not be left on by mistake. The circuit generates about two LED flashes per second, but the mean current drawing will be about 200µA. Transistors Q1 and Q2 are wired as an uncommon complementary astable multivibrator: both are off 99% of the time, saturating only when the LED illuminates, thus contributing to keep very low current consumption.

Flashing-LED Battery-status Indicator Circuit diagram :

Flashing-LED Battery-status Indicator Circuit Diagram

The circuit will work with battery supply voltages in the 5 - 12V range and the LED flashing can be stopped at the desired battery voltage (comprised in the 4.8 - 9V value) by adjusting Trimmer R4. This range can be modified by changing R3 and/or R4 value slightly.

When the battery voltage approaches the exhausting value, the LED flashing frequency will fall suddenly to alert the user. Obviously, when the battery voltage has fallen below this value, the LED will remain permanently off. To keep stable the exhausting voltage value, diode D1 was added to compensate Q1 Base-Emitter junction changes in temperature. The use of a Schottky-barrier device (e.g. BAT46, 1N5819 and the like) for D1 is mandatory: the circuit will not work if a common silicon diode like the 1N4148 is used in its place.

Parts :

R1,R7__________220R 1/4W Resistors
R2_____________120K 1/4W Resistor
R3_______________5K6 1/4W Resistor
R4_______________5K 1/2W Trimmer Cermet or Carbon
R5______________33K 1/4W Resistor
R6_____________680K 1/4W Resistor
R8_____________100K 1/4W Resistor
R9_____________180R 1/4W Resistor
C1,C2____________4µ7 25V Electrolytic Capacitors
D1____________BAT46 100V 150mA Schottky-barrier Diode
D2______________LED Red 5mm.
Q1____________BC547 45V 100mA NPN Transistor
Q2____________BC557 45V 100mA PNP Transistor
B1_______________5V to 12V Battery supply
Notes :

Mean current drawing of the circuit can be reduced further on by raising R1, R7 and R9 values.

Source : Red Circuits

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Saturday, October 18, 2014

LED Bike Light Circuit Project circuit diagram

These are a bit of an over-kill, but there were plenty of these at my school, so that is why I used them. Something a little smaller will also work. The power supply is connected to an astable multi-vibrator. This alternately drives the front light and the rear light. The frequency is determined by the RC time-constant of R3 and C3, and R2 and C4. This time can be calculated with the formula: t = R3×C3 = 20×103×10×10-6 = 0.2 s You can use a 22k (common value) for R2 and R3, that doesn’t make much difference. On a small piece of prototyping board are six LEDs with a voltage dropping resistor in series with each pair of LEDs.

Circuit diagram:

LED Bike Light Circuit Diagram

Such a PCB is used for both the front and the rear of the bike. Of course, you use white LEDs for the front and red ones for the rear. The PCB with the main circuit is mounted under the seat, where it is safe and has been working for more than a year now. There are a few things I would change for the next revision. An on/off switch would be nice. And if the whole circuit was built with SMD parts it could be mounted near the front light. This would also be more convenient when routing the wiring. Now the cable from the dynamo goes all the way to the seat and from there to the front and rear lights.

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Thursday, October 16, 2014

Thirteen Color LED Rainbow

Only a few years ago, the choice of LEDs was limited to IR, red, yellow, and green. The LED manufacturers have been busy extending the spectrum, and filling in the gaps. The latest generation of organic LEDs (OLEDs) has added some dazzling new colors to the spectrum. This circuit uses a set of 13 differently colored LEDs to generate a full color spectrum. The photo does not fully represent the colors generated due to camera limitations. The real-world display is very eye-catching. If you want to "trick out" your PC, this circuit is for you. Forget about those boring blue PC light displays.

Specifications:

Operating Voltage: 6-12V DC
Operating Current: 145ma at 12V DC

Theory:
The LM2940T-5.0 low dropout voltage regulator converts the 6-12V DC input power to regulated 5 Volts. It was chosen over a standard 7805 regulator so that the circuit could maintain regulation while operating on a 6V battery. The 1N4001 diode protects the circuit from reverse polarity, if a battery or power supply capable of generating over 1 amp is used, a 1 amp fuse should be installed between the supply and the circuit. The 5 Volts is used to drive each of the LEDs through individual current limiting resistors.

The resistor values were determined experimentally for equal brightness. Values are given as examples only, different sources of LEDs will require different resistor values. Resistor selection turns out to be the most difficult part of the circuits construction. A 100 ohm resistor in series with a 1K pot could be used in place of each resistor if individual brightness adjustments are desired. The table below lists the LED colors and wavelengths.

LED Color Wavelength Description
Deep Red 700nm ---------
Red 660nm traditional red
Orange Red 635nm "high efficiency" red
Orange 623nm also called red orange
Amber 594nm ---------
Yellow 588nm & traditional yellow
Yellow Green 567nm traditional green
True Green 523mn --------
Cyan 501nm verde green, blue green
Aqua 495?nm ---------
Deep Blue 470nm ultra blue
Powder Blue 430nm first generation "powder blue"
Violet 410nm ---------

Construction:
The circuit was built on a prototype perforated board with printed solder pads. The circuitry is hand-wired on the back side of the board. Care should be taken when soldering to the LEDs, a clip-on heat sink should be used while soldering the leads. Care should be taken to avoid zapping the LEDs on the violet side of the spectrum, they are sensitive to static electricity. The circuit board can be mounted on a piece of white hardboard, the white paint reflects the colors nicely.

Use:
Apply power to the circuit and enjoy the colorful glow. Do not stare directly into the array at close range for extended periods, some of the LEDs are extremely bright.

Taking The Circuit Further:
The spectrum could be extended on both the IR and UV sides. A brief scan through the Mouser catalog indicates the availability of these IR wavelengths: 940nm 880nm, 875nm, 870nm, 850nm. UV LEDs at 400nm, 395nm and 380nm are also available. There are also many LED colors available with wavelengths between the 13 colors shown, the colors selected were chosen for an evenly spaced color spectrum.

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Sunday, September 21, 2014

Efficient LED Blinking for Embedded Systems

Smart hardware design can simplify the embedded software and make it more reliable. Designers use blinking LED signals to indicate different status and for inbuilt testability. Making an LED array blink requires an individual software loop for each LED or an individual timer and specific software to serve it. This can be an issue in a system that uses low-level MCUs which provide limited resources.

Fig. 1: Circuit for efficient LED blinking for embedded systems

The schema presented here solves this problem by adding a simple hardware comprising low-cost inverters with Schmitt trigger for blinking as many LEDs as required.

Circuit and working

Fig. 1 shows the schema for efficient LED blinking for embedded systems. It uses different arrangements to make five different LEDs (LED1 through LED5) blink at individual rates. The schema is built around 74HC14 (IC1) containing six inverters with Schmitt triggers at the inputs. The frequency of blinking is usually selected in the 0.2-20Hz range.

The combination of inverter N1, resistor R1 and capacitor C1 is used as a square wave generator to blink LED1. LED1 blinks when output OUT0 from the MCU is high and goes off when output OUT0 is low.

The combination of inverter N2, resistor R2 and capacitor C2 works as a second square wave generator that makes LED2 blink. LED2 blinks when output OUT1 of the MCU is low and glows constantly when the output is high due to reverse orientation of D2.

Sometimes an LED needs more current than that provided by a single inverter. In that case, two or more inverters can be connected in parallel. Such an arrangement is made using inverters N3 and N4, resistor R3 and capacitor C3. The direction of diode D3 determines the logic of control of LED3 as indicated in the previous arrangements.

If you want two LEDs blinking alternately, the setup is made using inverters N5 and N6 together with resistor R4 and capacitor C4.

When OUT3 is low, LED4 is ‘off’ and LED5 is ‘on.’ When OUT3 is high, LED4 and LED5 blink alternately. The frequency of blinking in all the cases depends on the value of the adjoining resistor and capacitor.

Fig. 2: An actual-size, single-side PCB for efficient LED blinking for embedded systems

Fig. 3: Component layout for the PCB

Construction and testing

An actual-size, single-side PCB for efficient LED blinking for embedded systems is shown in Fig. 2 and its component layout in Fig. 3. The PCB provided is only for learning purpose and can be enclosed in a suitable case.

To test the schema, measure input supply at TP1. It should be around 5V DC with respect to TP0. Now make OUT0 high and measure the frequency at TP2. It should be around 2.5 Hz. Similarly, measure the frequencies at test points TP3, TP4, TP5 and TP6 as shown in the test points table.

Sourced by: Efy: Author : Petre Tzv. Petrov

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Saturday, September 13, 2014

How to Create Link XLamp XM LED

The XM-Lamp LED can be regarded as the highest performance LED, solid state single LED that is capable of producing ultra-bright light intensities. These LEDs offer a unique combination of high efficiency, it is able to efficiently provide 1000 lumens 100 lumens per watt at 3, 5 mm x 5 mm. The schema described here can be used for applications in residential lighting and automotive LEDs should be mounted on suitable heat sinks for optimal performance. For more information on this, you can consult the datasheet in the link below.

Create Link XLamp XM-LED Circuit Diagram

Specifications:
Size (mm x mm) 5 x 5
Maximum unit current (A) 3
Maximum power (W) 10
Light output Up to 1040 lm 10 W @
Typical forward voltage (V) 3.1
Viewing angle (degrees) 125
ANSI binning
Thermal Resistance (° C / W) 2.5
Yes Reflow-solderable - JEDEC J-STD-020C-compatible
RoHS and REACH-compliant Yes
UL recognized component Yes - Level 4 Cash Consideration

Datasheet Download Led Cree XLamp XM-LED

Under a connection pattern of three Xlamp Cree XM-LED can be used as lighting in vehicles.

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Friday, August 29, 2014

1 5V LED Flasher Wiring diagram Schematic

This is so simple schema diagram.you can power this schema with 1.5V power supply.To get maximum results please build this on a PCB

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Tuesday, August 26, 2014

40 LED Bicycle Light

The 555 schema below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). Two transistors are used to provide additional current beyond the 200 mA limit of the 555 timer. A single LED is placed in series with the base of the PNP transistor so that the lower 20 LEDs turn off when the 555 output goes high during the T1 time interval. The high output level of the 555 timer is 1.7 volts less than the supply voltage.

40 LED Bicycle Light Circuit Diagram

Adding the LED increases the forward voltage required for the PNP transistor to about 2.7 volts so that the 1.7 volt difference from supply to the output is insufficient to turn on the transistor. Each LED is supplied with about 20mA of current for a total of 220mA. The schema should work with additional LEDs up to about 40 for each group, or 81 total. The schema will also work with fewer LEDs so it could be assembled and tested with just 5 LEDs (two groups of two plus one) before adding the others.

Circuit Source: DIY Electronics Projects

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Wednesday, August 20, 2014

Efficient Automatic White LED Emergency Light Circuit

Referring the figure, we see that the schema is actually very easy to understand, let’s evaluate it with the following points:

The transformer, bridge and the capacitor forms a standard Power supply for the schema. The schema is basically made up of a single PNP transistor, which is used as a switch here.

We know that PNP devices are referenced to positive potentials and it acts like ground to them. So connecting a positive supply to the base of a PNP device would mean grounding of its base. Here, as long as mains power is ON, the positive from the supply reaches the base of the transistor, keeping it switched off. Therefore the voltage from the battery is not able to reach the LED bank, keeping it switched off.

In the meantime the battery is charged by the power supply voltage and it’s charged through the system of trickle charging.

However, as soon as the mains power disrupts, the positive at the base of the transistor disappears and it gets forward biased through the 10K resistor.

The transistor switches ON, instantly illuminating the LEDs.

Initially all the diodes are included in the voltage path, and are gradually bypassed one by one as the LED gets dimmer.

Parts List

R1 = 10K,

C1 = 100uF/25V,

D1, D2 = 1N4007,

D3---D6 = 1N5408,
T1 = BD140

Tr1 = 0-9V, 500mA,

LEDs = white, hi-efficiency, 5mm,

S1 = switch with three changeover contacts.

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