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
Computer Interface Circuits
Computer Interface Circuits
interface an LCD to 89c51 using 4 bit mode
how to interface an lcd to 89c51 using 4 bit mode. am using lampex16200 pls send me manual of this controller..
SRAM interface tutorial covering basic fundamentals
Flash memory interface tutorial covering basic fundamentals
Flash memory or a flash RAM is a type of nonvolatile semiconductor memory device where stored data exists even when memory device is not electrically powered. It`s an improved version of electrically erasable programmable read-only memory (EEPROM). The difference between Flash Memory and EEPROM are, EEPROM erases and rewrite its content one byte a
Central Locking Interface
Some cheap car alarms do not have a connection for the central locking system. However, in most it should be possible to find a point in the alarm circuit..
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, i..
Interface Circuit for PC Soundcard Oscilloscope
For simple electronic circuits, it may be sufficient to get a qualitative insight on dedicated electrical signals. This interface circuitry allows to use the line-in input of a standard PC soundcard to be used as a 2-channel oscilloscope. This setup does not allow for exact measurements, however for some applications, a qualitative insight on dedi
Precision capacitive sensor interface
4bit alphanumeric LCD interface 8051
using only total of 7 pins from your microcontrollers GPIO. So LCD module will cost only single port out of fours. >> The EN line is called "Enable. " This control line indicates to the LCD that we are sending it data. To send data to the LCD, the EN should be low (0) and then set the other two control lines and/or put data on the data bus. When...
220V Power Line Interface
This simple 220V power interface is intended as an interface for monitoring electric equipments and devices using a computer. The interface only senses whether the device being monitored is turned on or off. The most important aspect of the circuit is the galvanic isolation between the AC main line being monitored and the interface to the computer
Microcontroller Relay Driver and Interface
Many microcontroller designs typically mix multiple interfacing methods. A microcontroller (µC) system can be viewed as a system that reads from inpu..
AVR Microcontroller Interface with Stepper Motor
In this Tutorial we are using atmega8 with 4 MHZ Crystal and unipolar stepper motors, ULN2003 is Darlington pair driver I.C s used
4X3 Keypad Interface Circuit
P89v51rd2 Interface With Adc Mcp3202
In this interface session we are interface mcp3202 adc interface with 8051 microcontroller. Mcp3202 is a 12bit spi protocol adc, is interface with P89v51rd2 microcontroller,this microcontroller have spi protocol so no need to worry about SDI,SDO,CLCK. Interface mcp3202 to 8051 microcontroller CS is P2.2 and MOSI is connected to P1.5 and MISO is...
PIC16F877A INTERFACE CIRCUIT WITH LCD
PC joystick interface circuits
PC joystick interface
This joystick model was presented by IBM together with their first IBM PC computer. The joystick is just a basic analogue joystick with two buttons. The original joystick interface had circuit for connecting two joysticks, but had only one joystick connector. A special Y-cable was needed if there was need for two joysticks at the same time....
ZX Interface 2
The circuitry of the ZXInterface2 is very simple and is comprised of a single custom made IC which performs address decoding for the twin joystick interface. The ROM cartridge socket simply exposes signals already available from the Spectrum`s edge connector. As can be seen from the P. C. B. photographs, at least two issues of the board were...
IDE interface project
An IDE interface board and I`m currently working on the driver software to support reading/writing on a hard drive under my OS-X 2. 0 RTOS. An assembled IDE interface board is shown below. Download pcb. zip which contains the schematic and PCB layout files in Adobe Acrobat (. pdf) format. It also contains PALASM source and JEDEC file for the AMD...
wiegand converter circuit with LCD interface
Build your own PC interface
TNC and Modems ruled the world of digital communications until recently. With the advent of high speed computing and digital signal processing (DSP) all this has changed. If you own a home computer (PC) with a sound card, all you need to do is download software and obtain an interface between the PC and your radio. The interface provides the audio
2-wire LCD interface using PIC16CF84
Alphanumeric LCD displays have become very popular for microcontroller applications because they can add a lot to a project in a variety of different ways. A text message giving the user instructions as well as feedback can make the application seem much more "professional" and easy to use. I like to use LCD`s to help debug applications, with...
AT89C2051/4051 Stepper Motor Interface
M1 is a stepper taken from an old disk drive. There are five pins, i. e. , common, coil 1, 2, 3 and 4. Resistance measured between common pin and each coil is about 75 Ohms. Driving current for each coil is then needed about 60mA at +5V supply. A Darlington transistor array, ULN2003 is used to increase driving capacity of the 2051 chip. Each...
PIC USB Interface
The second program just sends "Hello world" to the PC. By default my board uses the Virtual COM Port (VCP) driver so you can view the output using Hyperterminal or similar program, I recommend PuTTY. The setup is quite simple, when I plug the PCB into my PC, it installs as COM3: (it will be different on your PC). In the terminal program you...
X10 Speech Recognition Interface pg4
The circuit is based on the PIC 16F877 microcontroller, see schematic in figure 4. The digital display output of the speech recognition circuit connects directly to the pins of the microcontroller. The LED in, provides a trigger that informs the microcontroller when a word has been spoken. The LED output connects to one side of a comparator. The o
Microcontroller interface electrometer
My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres..
Circuit Simulation through Arduino Processing Interface Circuit
16 bit brain wave interface for ArduinoRaspberry Pi
Interface Bus Motorola Interconnect Driver Schematic
Bus Interface Description RS422
EIA/TIA-422 defines a Balanced (differential) interface; specifying a single, unidirectional driver with multiple receivers (up to 32). RS-422 will support Point-to-Point, and Multi-Drop circuits, but not Multi-Point [ EIA485 ]. EIA-485 devices may be used in 422 circuits, but EIA-422 may not be used in 485 circuits (because of the lack of an Enab
Bus Description RS423 Serial Interface
The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). ". Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in integrated circuit technology, that may be employed when specified for the interchange of serial b
I2C Bus I2C Interface description
The I2C bus uses a bi-directional Serial Clock Line [SCL] and Serial Data Lines [SDA]. Both the SCL and SDA lines are pulled high via an Rp resistor. Resistor Rs is optional, and used for ESD protection for `Hot-Swap` devices. No other lines are specified. Any device may be a Transmitter or Receiver, and a Master or Slave. Data and clock are sent
USB Interface 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