Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Light Laser LED Circuits
Two Transistor LED Flasher circuit
1.5 Volt LED Flashers circuit
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..
High-intensity LED Warning Flasher circuit
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 bicycle front light (i.e. for road illumination) and red LEDs only when used as a tail...
Led or Lamp Flasher Circuit
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 up to 10W..
Solar Panel Based Charger And Small LED Lamp circuit
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 of 300-350 mA. Using it you can charge three types of batteries: lead acid, Ni-Cd and...
28 LED Clock Timer circuit
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 minute intervals within the hour. 4 additional LEDs are used to indicate 1 to 4 minutes of...
72 LED Clock circuit
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 eight 74HCT164 shift registers cascaded so that a single bit can be recirculated through...
9 Second LED Timer and Relay Circuit
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 be high and the voltage at pins 6 and 2 of the timer will be a little less than the lower t
LED Series Resistor Calculator
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 current (20-30 mA) LEDs is a simple task - adding a small resistor in series is the easiest
AT89C2051/4051 Driving Dot LED
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 correcting any polarity DC adapter. Without the 2051 chip in the socket, checks the connection, th
AT89C2051 Serial CMOS to LED Driver
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 hat prize, and figured I could use up some of the spare LED`s I have laying about after my
LED Timing Light
7-Segment LED Decoder
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.
Buck Converter LED Driver for Automotive
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. The constant current regulation is especially beneficial for LED color accuracy and longer
LEDs Fade In/Out Circuit Problem and LED Sequencer
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..
Noise in Amp from LED Strip & servo
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 transistor(TIP120), an LED strip taking 1A from the same 12V supply. There 1) Now the rapid switching...
circuit flashing led schematic
41 LED Flasher Circuit using 555 IC
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..
Accelerometercontrolled LED Bike Helmet
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..
Custom LED Touch Light Fixture
The circuit can be divided into four sections: power supply, touch sensor, microcontroller, and LED driver. The touch sensor is connected to the frame..
DIY Full LED 600+ Lumens LED Headlight
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..
DIY LED Tachomter (RPM gauge)
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 the red zone. You MUST use bright ones if you are planning to put paper covers over the...
Flashing LED using 555 Timer
High-Brightness LED Grow-Light
Note: This project page has morphed into a design discussion. (Constructive suggestions and collaboration are still welcome. See the comments sectio..
LED Flasher Schematic
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 duty cycle. For the R and C values shown, then flash rate is about 1. 4 Hz (which is about 8
LED LYT Meter PIC Microcontroller
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..
LED Speedometer circuit
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-compatible LED glasses
Audiostrobe glasses are used in conjunction with light and sound machines, as well as some brainwave entrainment software. The glasses have LEDs buil..
LED Light Show and Audio Amplifier all in one
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,..
simplest light with constant-current LED circuit
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..
Rotating LED Marquee Hat circuit
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..
Light Sensing Circuits
Light Dimmer Circuits
Ultrasonic distance finder circuit
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 measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
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 find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
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 circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
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 circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
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, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
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 calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
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 supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
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. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial