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
DIY HV Variable Cap
DIY PMA alternator
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
driving multiple 7 segment displays
static 0 to 9 display
The circuit shown here is of a simple 0 to 9 display that can be employed in a lot of applications. The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1). The seven segment display consists of 7 LEDs labelled a` through g`. By forward biasing different LEDs, we can
three digit display.
The Mini 3 digit display aka "DVM-module" (digital voltmeter module) can easily be tuned and modified because you have control over the firmware. The key advantages of this module are: The internal reference voltage in the atmega8 microcontroller is 2. 56V. Just by adding 2 resistors one can measure any voltage higher than 2. 56V. How can I measure
how lcd display interface circuit works 20
An LCD -liquid crystal display is an electronically-modulated optical device made up of any number of pixels filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The block diagram shows the LCD gets a data source from the application processor, so therefore LCD is bei
temperature controller using ds1820 and lcd display
This Project is used to indicate the temperature and it is also used as controller. The system will get the temperature from the DS1820 and it will display the temperature over the LCD display. There are 2 preset levels, one is low preset and the other is High preset. The temperature was compared with the value stored by the user and if the temper
interfacing mma7660 accelerometer to 8051 display values on lcd
Digital Temperature monitor with LM5 and AT89C51
I plugged the temperature onto 8 LEDs (I'm using a DeccanRobots package, and so this was supplied with the board). It worked, showing the temperature in binary form . Now when I tried using my microcontroller with this program I wrote to output the number on 4 7-segments(also included in the DeccanRobots package), it ended up showing me "29.9".
keytop and display for electronic devices
A keyboard key figure who work with electrical contact between the surface of the keyboard and the underlying circuit when pressed keytop area, used by some home computers the early 1980s, and has been widely used in consumer electronic devices.
laptop lcd display to vga interface project
led vu display circuit
A universal digital gear display that can be installed on any motorbike. A low cost solution based on simple TTL digital technology without software programming..
lm75 temperature sensor with 7 segment display output
This is a test project built hastily on a solder less breadboard. It uses a LM75 to read the current temperature via I2C and displays the result..
led dot matrix display
How to drive an dot matrix led display. This project shows you how to drive one with 64 LEDs (8 rows by 8 columns) or less e.g. 35 LEDs (7 rows by 5 columns)..
build a scrolling message display circuit
Seven-7-Segment Counter Circuit with LED Display-Diagram and Schematic
A simple seven/7 segment counter circuit with an LED display. This counter circuit diagram is designed using IC CD 4033 as counter,555 Timer IC and seven segment LED Display LT 543..
Led display digital Voltmeters
Liquid-Crystal Display (LCD) Tester
A segment may be tested by applying an alternating voltage of a few volts across it. Note that the application of a direct voltage will damage the display irreversibly: the resulting current will remove the tracks. The alternating voltage should contain not even a tiny direct voltage component. An alternating current also removes part of the...
Implementing Adaptive Brightness Control to Seven Segment LED Displays
An automatic brightness adjustment is a closed loop system that has the capability to assess ambient light and adjust the brightness of the display accordingly. In ..
bcd counter 7 segment display
I`m doing this lab BCD COUNTER and 7 SEGMENT DISPLAY and im using CD4510BMS presettable BCD Up/Down Counter. I was able to do the counting from 00-99 but i can`t figure out the counting from 32-84. Do i need another gate for this operation Okay, sorry about that. I need to start it from 32-84 and around again. Instead of starting 00-99, i need to
microcontroller driving 4x7 segment display pic 2
I`m designing a circuit to drive a 4x7 segment display using a PIC. I`ve done this in the past without any drama. I would just use four pins to control each of the four digits (one each). I`d switch one digit on, wait a bit, turn it off, then switch the second digit on etc. I was hoping that I could get away with using just one pin from the PIC an
7 segment LED display
I have successfully used a 4511 IC to make numbers 1-9 appear on a 7 segment led display, cool. Now how can I use this to say have it display a number ..
LCD Liquid Crystal Display
An LCD basically consists of two glass plates with some liquid crystal material between them. The LCD has an electrically controlled light polarising liqui..
Led display digital Voltmeter
an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit employs the ADC (Analogue to Digital Converter) I. C. CL7107 made by INTERSIL. This IC i
The basic principle of the theremin is theheterodyne oscillator. When I started developing the Open. Theremin I knew that I needed a stable and reliable oscillator. So I searched the internet and found various schematics with different components. I built them each on a small board and connected them to the micro controller to measure the performan
Led display digital Voltmeter
LCD displays easy to use and easy to build
Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "heartbeat". The "heartbeat" is added by the LCDd server. This "heartbeat" icon blinks once in a while to indicate that the display is still alive. In lcdproc you can have more than just...
Display Text on an HD44780 LCD with an Arduino
To do this, first, we must make the appropriate physical connections from the arduino board to the LCD. Then after, we must write the code so that whatever text we want displayed comes up on the LCD. LCDs are pretty much the standard now in order to display text to users of a device. Almost all electronic devices which give a readout to users of s
lf286 Linux USB LCD display with watchdog and buttons
This article is the result of the very positive feedback on the hardware articles that I have written so far. You LinuxFocus readers are really a great audience! Some of you wanted to know how to interface the USB bus. So here is a nice solution. We use the LCD display from the May 2002 article and make it work with the USB bus. The whole thing wi
lf253 Frequency counter 1Hz-100Mhz with LCD display and RS232 interface
This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: This time we design a frequency counter which can measure frequencies from 1Hz to 100MHz. Alternatively you can use it also to just count events, such as how many people crossed the street (
digital dice with 7 segment display
simple mini running text display
Keypad and LCD Display Module for Data Entry
Control your instrument with a 4x20 LCD display and 4x5 keypad designed for front panel feedback and control..
Digital to Analog Circuits
Analog to Digital Circuits
Data Logging Circuits
Data Bus 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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity