LED Circuits
- Page 21-
The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED.... -
This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only are recommended if the circuit is used as a.... -
This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps.... -
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current.... -
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5.... -
In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of.... -
This circuit provides a visual 9 second delay using 10 LEDs before closing a 12 volt relay. When the reset switch is closed, the 4017 decade counter will be reset to the 0 count which illuminates the LED driven from pin 3. The 555 timer output at pin 3 will.... -
All LEDs require some form of current limiting. Connecting an LED directly to the power supply will burn it out in a heartbeat. Overdriving, even briefly, will significantly reduce it`s life and light output. Fortunately, driving a single or a string of low.... -
A basic circuit of the 89C2051 shown here can be made easily using point-to-point soldering with a universal PCB. Use an ordinary 20-pin socket, do not use a circle-pin socket. D1 is a small dot LED. U2 can be either 7805 or 78L05. U3 is optional for.... -
This ridiculous hat is one of my typical procrastination projects. During swatvac for my final exams I got invited to a friends hat themed Birthday party. With nothing better to do (well apart from study for my exams) I decided that I wanted to win the best.... -
It can be possible and it can be implemented using P-MOS and N-MOS together in a circuit i. e. what is called C-MOS. There we can implement Three Terminal NAND GATE. It is a universal gate which is used commonly so can proceed further... -
TLD 5085EJ is a smart LED buck converter with an integrated power switch capable of driving up to 1. 8A load current with excellent line and load regulation. This device is primarily aimed at stepping down input voltage and regulating a constant LED current..... -
I built this circuit from the led beating heart frame instructable. I can`t seem to get it to work. Any ideas? I also built this led sequencer. It doe.... -
TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power.... -
I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the t.... -
The Arduino site has thorough documentation on how to connect LEDS to the Arduino via the Max7221. For this, you will need this subset of ingredients.... -
The circuit can be divided into four sections: power supply, touch sensor, microcontroller, and LED driver. The touch sensor is connected to the frame.... -
Now gently bend the leads of the LEDs and using the schematic circuit diagram given below begin to solder Once you finish soldering, it shoul.... -
Each one can drive 10LEDs in either bar mode like this project or dot mode. Switching between both modes can be done, more instructions in datasheet. 21 LEDs of any color you want. I used bright white ones. You can use some green, some yellow & some red for.... -
Note: This project page has morphed into a design discussion. (Constructive suggestions and collaboration are still welcome. See the comments sectio.... -
Here`s the new flasher circuit schematic. It consists of a 555 timer circuit and a power transistor. The power transistor is probably way overkill, (it is rated at 10A) but it`s what I had available. You can vary C1, R1 and R2 for to vary the flash rate and.... -
Hello everyone, thank you for checking out my first Instructable. I have enjoyed seeing your creations over the years and love what all of you are con.... -
Attached the circuit schematics 12 Volts : from car battery Ground : Car chassis Signal : from the sensor stepper motor The No 5 Pin of LM3914 c.... -
Audiostrobe glasses are used in conjunction with light and sound machines, as well as some brainwave entrainment software. The glasses have LEDs buil.... -
The hardware within this circuit involved a Picaxe 18M2 IC which is the programmable micro-controller in my design which can be programmed using a PC,.... -
Here`s a really simple and inexpensive ($1) LED driver circuit. The circuit is a constant current source, which means that it keeps the LED brightne.... -
Here`s the schematic for the circuit. Solder all the components onto perfboard. Sorry the drawings kind of bad. Basically, the 555 timer sends a pulse....
New Circuits
-
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
Popular Circuits
Spring reverb units are most commonly used in guitar amps, having been replaced by digital...
this circuit uses the LM3914 and should be powered by its own battery, otherwise you might get an...
This circuit us gives the sense of movement of ball up down, after the LED turn on successively...
The DUT"s(Device Under Test) cathode, anode, and gate are connected to the unit"s K, A, and G...
One of the difficulties in the design of higher-order tunable bandpass filters is achieving...
The LM3914A bargraph LEDis used here as a voltmeter for battery testing. The circuit is powered...
The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in...
Using the LM4992 stereo audio power amplifier you can design a very simple audio power amplifier...
If you`re just building a dual stand-alone preamplifier (as for, say, a stereo magnetic phono...
.webp "Open page in a new tab")
The HID ballast circuit includes (Figure 1) a buck stage for controlling lamp current and power,...