LED and Light Circuit

BATTERY_CHARGE_INDICATOR

Published:2009/6/22 22:28:00 Author:May

When a battery is charging, a voltage drop across RSENSE causes Q1 to conduct,and lights LED1. RSENSE should be chosen as follows:   (View)

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UNDERVOLTAGE_INDICATOR_FOR_SINGLE_CELL

Published:2009/6/22 22:22:00 Author:May

When operating with a single cell，it is necessary to incorporate switching circuitry to developsufficient voltage to drive the LED，A circuit that accomplishes this IS drawn In the figure shown Basically， it IS a voltage-cqntrolled asymmetrical multivibrator with a minimum operating thresholdgtven by∶ Above this threshold，the flash frequency increases with voltage This is a far more noticeable indication of a deteriorating battery than merely dimming the LED In addition，the indicator can bemade visible with considerably less power drain With the values shown，the flash rate is 1.4 sec -1at 1.2V with 300-μA drain and 5.5 sec-1 at 1.55V with 800-μA drain Equivalent visibility for continuous operation would require more than 5-mA drain.   (View)

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KEY_ILLUMINATOR

Published:2009/6/19 4:42:00 Author:May

Used as a 10-second momentary illuminator, this circuit can be useful in other applications as well. Pressing S1 charges C1, which holds Q1 on and holds the LED lit for about 10 seconds.   (View)

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Buick headlamps circuit diagram (with the low beam control DRL)

Published:2011/5/6 1:40:00 Author:Jessie | Keyword: headlamps

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LED_OUTPUT_INDICATOR_FOR_555_CIRCUITS

Published:2009/6/19 3:58:00 Author:May

A pair of LEDs connected as shown here can be used with just about any low-frequency 555 os-cillator to give high-/low-output indications. When the output goes high LED2 turns on, and when the output goes low LED1 tums on.   (View)

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RECEIVER_SIGNAL_STRENGTH_INDICATOR

Published:2009/6/19 3:58:00 Author:May

Using an AD606 log amplifier, this indicator gives a logarithmic output of +0.3 V at -80-dBm in-put to +3.5 V at 10-dBm input. Frequency range is to 50 MHz for this IC device.   (View)

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CURRENT_INDICATOR

Published:2009/6/19 3:57:00 Author:May

An LED requires 1.5 to 3 V across its terminals to light. This circuit uses a resistor shunt in series with source and load to produce this drop and cause the LED to Iight. At higher currents (>100 mA) use limiting resistors in series with LEDs to limit current to a safe value.   (View)

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MODEL_OAR_DERBY_WINNER_INDICATOR

Published:2009/6/19 3:56:00 Author:May

This derby-winner inc!icator uses infrared emitters and sensors to detect a car crossing the fintsh line. The first car to finish locks out the data from the second car, and the system can be reset by pressing S1.   (View)

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LEAD_ACID_TRIOKLE_CHARGER

Published:2009/6/19 3:10:00 Author:May

This lead-acid battery trickle charger can be used as a stand-alone circuit (for alarm systems and such) or combined with the circuit in the figure to create an emergency lighting system.   (View)

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LED_FLASHER

Published:2009/6/19 2:52:00 Author:May

This circuit provides a low-cost way to flash an LED from a single 1.5-V source. Based on the ICL7660 dcto-dc voltage converter, the circuit makes use of an extemal capacitance (C1) on the os-cillator ratecontrol pin to decrease the charge/dump time to the desired flash rate. A dc resistance (R1) on the same pin can also be used to disable the oscillator and extend the power-cell's life. That optional dc resistance (in the form of a photoconductive cell) will shut off the oscillator in daylight.   (View)

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LED_PULSER_WITH_AUDIBLE_OUTPUT

Published:2009/6/19 2:49:00 Author:May

The LM3090 can also be used to drive both an LED and a speaker. In this circuit, each time that LED1 blinks, SPKR1 (an 8-Ω speaker) emits a sharp click sound.   (View)

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LED_PULSER

Published:2009/6/19 2:48:00 Author:May

In this circuit, the LM3909 is used to drive a pair of series-connected LEDs.   (View)

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VARIABLE_FREQUENCY_HIGH_POWER_LED_FLASHER

Published:2009/6/19 2:47:00 Author:May

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RECHARGEABLE_LED_FLASHLIGHT

Published:2009/6/19 2:46:00 Author:May

This flashlight is useful for applications where night vision and/or darkness adaptation must be maintained. It uses an HLMP8150 T4 LED with a wavelength of 637 nm. This schematic is for the flashlight module. When the battery pack consisting of the four NiCad cells is fully charged (and there is no voltage at J1), 4.8 Vdc flows through trimmer potentiometer R2, the normally closed con-tact of relay RY1, and push-on/push-off power switch Al. Trimmer R2 limits the current flowing through LED1. Switch 51 can turn LED1 on and off when the battery is not being charged.   (View)

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FLASHING_CHRISTMAS_LED_DISPLAY

Published:2009/6/19 2:43:00 Author:May

Using LEDs and 3909 ICs，you can make aflashing-light circuit that will run for months ontwo AA batteries.   (View)

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FLASHING_NEON_CHRISTMAS_LIGHTS

Published:2009/6/19 2:41:00 Author:May

This flashing set of neon Christmas lights will make an attractive decoration for any time of year. B1 is made up of ten 9-V transistor radio batteries in series. The battery life can be measured in months.   (View)

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RANDOM_LED_STROBE

Published:2009/6/19 2:40:00 Author:May

This circuit generates a random output that is translated into LED movement by a prepro-grammed PIC16C55 microcontroller, U1. That PIC also senses and records the bias of the LED's movement. This device was originally used for an application involving psychokinesis testing where the person was asked to think the lights in either a clockwise or counterclockwise direction.   (View)

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HEADLIGHT_OFF_INDICATOR

Published:2009/6/19 2:37:00 Author:May

Increasing the value of R2 or C1 will lower the oscillator's frequency and decreasing one of those values will increase the frequency. The IC's output at pin 3 drives the LED through R3 and sends power to the piezo sounden Use a bright LED so that you will be able to see it in the daytime.   (View)

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Remote control type music color lamp circuit (2)

Published:2011/7/5 21:42:00 Author:zj | Keyword: Remote control type, music color lamp circuit

As shown in the diagram,the wire type music color lamp circuit candivide music signalinto high, medium and low three frequency bands, respectively drive the red, green, blue three colors lantern group with music flashing, can produce a riot of colours, colorful light. Available T transistor radio small input transformer ; inductance L homemade :use diameter of 1mm wire in a 25mmby 28mm insulating frame around the 200 windings. It will be fine.   (View)

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Remote control type music color lamp circuit (1)

Published:2011/7/5 21:49:00 Author:zj | Keyword: Remote control type, music, color lamp circuit

As shown in the figure it is a simple wire type music color lamp circuit. From the speaker at both ends of the audio frequency voltage through the wire connected to the A, B end, by the potentiometer RP partial pressure applied to the audio transformer T primary, audio voltage by T followed by a boost secondary to the bidirectional thyristor control VTH electrode and the second anode. When the audio frequency voltage is high, VTH opened, festoon lamp string E light; when the music stops or is weak enough to trigger the VTH, VTH in alternating current crosses zero is turned off. Therefore, the lamp string E brightness flickers with horn playing music rhythm. Regulating potentiometer RP value can modulate circuit wire sensitivity; T canadoptsmall input transformer in transistor radio.   (View)

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