Circuit Diagram

Three-way flashing light string circuit (4)

Published:2012/9/6 21:22:00 Author:Ecco | Keyword: Three-way, flashing light string

As shown in the figure, it is a three-way flashing light string controller with novel jumping, it can make light string be lit one by one and extinguished together, then lit one by again, and it works in the cycle. The circulation rate of circuit is mainly determined by the charging time constant of R6, C2, which can be adjusted according to needs; VT1 ~~ VT3 can choose ordinary MCR100-8 small plastic unidirectional transistors; the power of each street light string is preferably at 100W or less.   (View)

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Electrodeless Water Level Monitor

Published:2012/9/6 20:49:00 Author:Ecco | Keyword: Electrodeless, Water Level, Monitor

This system operates much like a classic float switch but without any moving parts. The illustration shows how a system using two copper coils sealed inside a plastic pipe, can detect the level of water outside the pipe. Whenever the water level is lower than the upper coil, no signal is coupled between the coils. Once calibrated, this technique might also work on the outside of a plastic water tank. Source: discovercircuits   (View)

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Wave Power Generator Demo System

Published:2012/9/6 20:49:00 Author:Ecco | Keyword: Wave Power Generator, Demo System

An inexpensive stepper motor is used as a voltage generator in this wave generator demo. Source: discovercircuits   (View)

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AUDIO AMP + 3KHz FILTER

Published:2012/9/6 20:48:00 Author:Ecco | Keyword: AUDIO AMP, + 3KHz, FILTER

This circuit is the audio amp section for a complete optical transmitter. The circuit amplifies and filters the voice audio signals from an electret microphone. The circuit is described in more detail in the receiver section of Dave Johnson's Handbook of Optical Through the Air Communications. Source: discovercircuits   (View)

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Incandescent Lamp Inrush Current Limiter

Published:2012/9/6 20:47:00 Author:Ecco | Keyword: Incandescent Lamp , Inrush Current Limiter

This circuit limits the large inrush current often associated with large incandescent lamps. With the components shown the current is limited to 1 amp, but it could be scaled to any desired current. Source: discovercircuits   (View)

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40KHz Limiting Amp

Published:2012/9/6 20:46:00 Author:Ecco | Keyword: 40KHz, Limiting Amp

This circuit has a gain of X20 at 40KHz. The amplifier output level is limited to 2.5v peak to peak. Limiting action begins with a 50v peak to peak input. Source: discovercircuits   (View)

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40KHz Light Detector with High Ambient Light Immunity

Published:2012/9/6 20:45:00 Author:Ecco | Keyword: 40KHz, Light Detector , High Ambient, Light Immunity

This circuit is designed for detecting infrared light modulated at around 40KHz. It?s feedback scheme cancels much of the DC component from ambient light. It?s conversion factor is about 100 millivolts per microwatt of 900nm light. Source: discovercircuits   (View)

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10MHz TO 20MHz LIGHT RECEIVER

Published:2012/9/6 20:44:00 Author:Ecco | Keyword: 10MHz TO 20MHz, LIGHT RECEIVER

Light power to volts conversion= approx. 15mV per microwatt at 850nM Source: discovercircuits   (View)

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Wig/wag LED Flasher

Published:2012/9/6 20:42:00 Author:Ecco | Keyword: Wig, wag, LED Flasher

This simple circuit will flash two LEDs in an alternating fashion. Source: discovercircuits   (View)

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White LED is Powered by One NiMH Cell

Published:2012/9/6 20:42:00 Author:Ecco | Keyword: White LED , Powered , One NiMH Cell

There are a lot of white LED driver circuits floating around. A popular circuit called the ?Joule Thief? can drive one white LED from a single 1.2v or 1.5v battery cell. Most of these circuits use one or two transistors to form a voltage boost circuit. Yes, they those circuit do drive a LED but they are not very efficient and they don?t do a good job of controlling the current to the LED. The circuit below uses a tiny LT1932 IC made by Linear Technology. This IC can be configured for a wide variety of LED driver needs. I have shown one simple application. The circuit takes power from one 1.2v NiMH rechargeable battery or a 1.5v disposable battery and drives a single white LED with 15ma of current. With an efficiency of about 70%, the circuit should run for about 40 hours, if a quality 2500ma-hour battery is used. Source: discovercircuits   (View)

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Universal 3v LED Flasher #1

Published:2012/9/6 20:41:00 Author:Ecco | Keyword: Universal , 3v , LED Flasher

The circuit below will flash any LED color with fixed current pulses powered by a 3v battery. It uses a charge pump approach, which routes a constant current pulse through the LED, regardless of the LED voltage requirement. Using this approach, white and blue LEDs, which normally require about 3.6v can be flashed with a 3v battery. With the component values selected, the LED is hit with 15ma current pulses lasting about 10ms every two seconds. This keeps the average current draw from a 3v battery to about 200uA. The circuit relies on a cheap 74HC14 hex Schmitt trigger inverter IC. One inverter forms a pulse generating oscillator. Other inverters are ganged together to increase the drive current. A two transistor circuit forms a constant sinking current controller. Source: discovercircuits   (View)

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Table Lamp with auxiliary 12v Automotive Style LED Light

Published:2012/9/6 20:41:00 Author:Ecco | Keyword: Table Lamp , auxiliary, 12v , Automotive Style, LED Light

This circuit provides about one watt of non-isolated DC power for an automotive type 12v LED array lamp in addition to a standard incandescent table lamp. Source: discovercircuits   (View)

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Super Bright 3v Powered LED Flasher (April 22, 2009)

Published:2012/9/6 20:40:00 Author:Ecco | Keyword: Super Bright , 3v Powered, LED Flasher

I have posted several kinds of LED flashers over the years. This is yet one more flasher, designed to flash any high power LED of any color. It hits the LED with a 25ms 250ma pulse once every 2 seconds. This works out to an average current about 3ma. It is powered by any 3v source. I suggest two AA cells but a single 3v lithium coin type cell will also work. With fresh AA cells, the light should flash for about two weeks. The light flash is very intense and is perfect for any attention getting night time application. Source: discovercircuits   (View)

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SIMPLE WHITE LED NIGHT LIGHT

Published:2012/9/6 20:40:00 Author:Ecco | Keyword: SIMPLE, WHITE LED , NIGHT LIGHT

This simple circuit is designed to plug into a standard AC electrical outlet. It uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are angled slightly to bounce the light off of a nearby wall. The light should last about 10 years. The circuit draws less than one half of one watt of power and can therefore run continuously. In spite of the low power, the LEDs provide sufficient illumination for most night light applications. Circuit component values for both 120vac and 240vac are shown. Source: discovercircuits   (View)

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Remote LED Indicator Light -- December 27, 2008

Published:2012/9/6 20:39:00 Author:Ecco | Keyword: Remote, LED Indicator , Light

There are times when you would like to transmit a signal from one LED indicator light to second LED at another location. The circuit below works well for this application. It takes advantage of the fact that the internal infrared LED inside an opto-isolator has a lower voltage drop than the visible LED being tapped into. Using a Darlington type opto-isolator also means very little current needs to be diverted to the isolator. The photo-darlington side of the isolator can be used to turn on the remote LED using any convenient DC source. In automotive applications, this is often 12v. You can also use the output of the opto-isolator to drive a low power beeper. This might be handy for something like a ?check engine? or a ?windshield washer fluid light. Source: discovercircuits   (View)

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Lighthouse LED Flasher

Published:2012/9/6 20:38:00 Author:Ecco | Keyword: Lighthouse, LED Flasher

This was originally designed for a model in a HO train set. It simulates the behavior of the light from a lighthouse. The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity. Source: discovercircuits   (View)

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High Power LED Flasher August 3, 2008

Published:2012/9/6 20:37:00 Author:Ecco | Keyword: High Power, LED Flasher

Power LEDs are becoming more popular these days. The DC input power to these devices ranges from 1 watt to 5 watts. Normal LEDs only receive about 0.05 watts. At this higher power, these devices can emit a lot of light. You can buy them in just about any color in the rainbow but white seems to be the most popular. One application for these devices is a flashing light. If the flash duration and flash rate is kept low, the average current can be low enough that even a small battery can last quite a while. Source: discovercircuits   (View)

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FLASHING LED POWER INDICATOR DRAWS LOW CURRENT .

Published:2012/9/6 20:37:00 Author:Ecco | Keyword: FLASHING LED, POWER INDICATOR, DRAWS LOW CURRENT

This circuit flashes a power indicator LED to keep the average current low. Source: discovercircuits   (View)

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AC Line Powered LED Pilot Light

Published:2012/9/6 20:36:00 Author:Ecco | Keyword: AC Line, Powered , LED Pilot, Light

This simple circuit can be used to light a LED indicator lamp, powered from the 120vac line. I have included component values for 240vac lines as well. Source: discovercircuits   (View)

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12v Lamp Current Indicator

Published:2012/9/6 20:35:00 Author:Ecco | Keyword: 12v, Lamp, Current Indicator

This circuit turns on a LED indictor light whenever DC current flows into a 12v lamp. Source: discovercircuits   (View)

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