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  • Dark Activated Led or Lamp Flasher

    2014-12-23 16:12:09136

    Simple photo-sensitive circuit, 3V battery supply This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscilla...

  • Two-variable-led-matrix-display

    2014-12-23 15:46:54144

    This matrix can show the values of two variables, for example, frequency and voltage. The display is a graph made from a matrix of LEDs. The LEDs on ea...

  • Solar Panel Based Charger And Small LED Lamp(7806)

    2014-12-23 15:40:27178

    This article briefly describes the Solar Panel Based Charger And Small LED Lamp (7806). This principle is easy to understand, but also very practical. ...

  • Knightrider lights for model cars

    2014-12-23 14:57:22108

    This simple circuit drives 6 LEDs in 'Knightrider scanner mode'. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS ...

  • Light switch

    2014-12-23 14:29:20104

    General Description This project will let you make a switch that will be activated by light falling on a sensor. It is a very useful device and can be ...

  • Audio Controlled Switch Circuit

    2014-12-23 13:40:15108

    This audio-controlled switch combines a pair of 741 op amps, two 2N2222 general-purpose transistors, a hcxFET, and a few support components to a circui...

  • Automatic street light circuit

    2014-12-23 12:54:28123

    There have been lot of problems in street lights. Major problem in some places is every evening a person has to come and switch ON the street light and...

  • Led or Lamp Flasher Circuit(BD139)

    2014-12-23 11:30:43488

    This article briefly describes the Led or Lamp Flasher Circuit (BD139). This principle is easy to understand, but also very practical. Depth understand...

  • 16 Stage Bi-Directional LED Sequencer(74HCT138)

    2014-12-23 10:49:45151

    This article describes the 16 Stage Bi-Directional LED Sequencer (74HCT138). The content is very simple, very practical. The components of the article ...

  • Modulated light-beam circuit

    2014-12-23 10:43:1781

    Feedback control of the phototransistor in this optical detector helps negate the effects of varying ambient light sources. The output of a modulated v...

  • Mains operated LED lamp

    2014-12-23 10:10:07151

    Description. This is a very simple and cost effective mains operated LED lamp which gives a very bright white light.Since no transformer is used, the c...

  • Solar LED Mood Light

    2014-12-23 10:06:26220

    Power this project from sunlight with a CirKits solar power circuit board kit.Other LED lamp circuits can be seen at FC`s Solar Circuits, another inter...

  • How to build AC Line powered LEDs

    2014-12-23 09:49:48120

    Description The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor ...

  • Sealed-Lead Acid Battery Charger

    2014-12-23 09:43:14104

    To optimally control the charge and hold cycle for sealed lead acid battery,UC2906 series of battery charger controllers is used by all of the necessar...

  • The combination sine wave circuit of 400Hz LED and operation

    2014-12-23 09:27:3883

    In dimensional calculation bridge circuit, LED with norlinear resistor usage and operational amplifier are used in combination, and the power supply vo...

  • How to build LED or Lamp Flasher

    2014-12-23 09:19:1291

    Minimum parts counting Designed for 3V battery operation Circuit diagram Parts: R1 33K 1/4W ResistorR2,R3 47R 1/4W ResistorsC1 10μF 25V Electrolytic C...

  • Voltmeter With LED For Car Battery

    2014-12-23 08:59:09132

    Below is a comparator circuit which is can measure with step of 1 volt, the voltage of car battery. The indication of voltage is done by comparison of?...

  • Temperature Controlled DC Fan With BC547 Transistor

    2014-12-23 08:49:57275

    Description: This circuit can be used to control the speed of a 12 V based on two transistors? DC fan depending on the temperature.A thermistor (R1) is...

  • Car Battery Voltmeter with LED Indicator(LM324)

    2014-12-23 08:35:15348

    This article describes a Car Battery Voltmeter with LED Indicator (LM324). The principle is very simple, very practical. The circuit components can hel...

  • Voltage controlled oscillator using LM111 voltage comparator

    2014-12-23 08:29:0982

    Radio Circuits Using LM111 voltage comparator , LM101 operational amplifier and some other electronic parts , can be designed a very simple and efficie...

  • 1921 Buick Model Schematic Wiring Diagram Starting and Light

    2014-12-23 08:11:5884

    This article presents the 1921 Buick models starting and lighting wiring diagrams. We recommend wiring work steps are: first carefully read after you f...

  • Temperature Controlled Relays

    2014-12-23 07:44:1486

    Description The first circuit energizes the relay when the temperature rises above the preset level. The second circuit energizes the relay when the te...

  • Interior facilitate lights

    2014-12-23 07:16:5278

    When the door is closed, the circuit keeps the dome light by the time Rl / chlorine OK. The time is appr oximately (1.1)R1 x C1 Reprinted Url Of This A...

  • Phone Message LED Flasher Circuit

    2014-12-23 06:57:0888

    This is a circuit of phone message flasher, an alternative way to get alarmed when there is an incoming call. When the phone rings, high line voltage w...

  • Circuit Diagram Of Slave Flash Light Control

    2014-12-23 06:48:1390

    Description: The following circuit shows about Slave Flash Light Control Circuit Diagram. Features: 68mH Inductor, give auto trigger for secondary flas...

  • 220VAC Christmas Flashing Light

    2014-12-23 06:40:45106

    This circuit is line powered flasher, can be used in any application, and Christmas lamp is one of the example.? Look at the circuits schematic diagram...

  • Bicycle back Safety Light

    2014-12-23 06:37:3094

    Flashing 13 LED unit, 3V supply Also suitable for jogger/walkers Circuit diagram Parts: R1 10K 1/4W Resistor R2,R9,R10 100K 1/4W Resistors R3-R8,R11-R1...

  • Low-Dropout, Constant-Current Triple White LED Driver

    2014-12-23 06:08:4278

    In conventional white LED design, the Max1916 low-dropout bias supply for white LEDs is a high performance alternative to the simple ballast resistors....

  • Temperature-Controlled Switch

    2014-12-23 06:04:5381

    It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when youre build...

  • High-voltage power supply circuit for fluorescent light

    2014-12-23 05:58:4690

    The following figure shows a diagram of power fluorescent lights to a normal battery. It is very convenient when you can not use the grid....

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