Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
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Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
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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
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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
Computer Interface Circuits
Computer Interface Circuits
NMEA 2000 CAN Marine Interface
The CAN Bus interface uses an asynchronous transmission scheme controlled by start and stop bits at the beginning and end of each character. This interface is used, employing serial binary interchange. Information is passed from transmitters to receivers in a data frame. The data frame is composed of an Arbitration field, Control field, Data field
CAN Bus Interface I/O Schematic
The CAN Interface is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. Each node uses a Male 9-pin D connector. The Bit Encoding used is: Non Return to Zero (NRZ) encoding (with bit-stuffing) for data communication on a differential two wire bus. A number
HS-3182 ARINC 429 Bus Interface Line Driver Circuit
The HS-3182 is a monolithic dielectrically isolated bipolar differential line driver designed to meet the specifications of ARINC 429. This Device is intended to be used with a companion chip, HS-3282 CMOS ARINC Bus Interface Circuit, which provides the data formatting and processor interface function. All logic inputs are TTL and CMOS compatible.
ULINKpro Interface Schematic
This interface schematic shows the JTAG, Serial Wire, and ETM interface circuits of ULINKpro. Use this schematic to analyze potential problems with the target hardware. ARM websites use two types of cookie: (1) those that enable the site to function and perform as required; and (2) analytical cookies which anonymously track visitors only while usi
Parallel Port CW Interface for N3FJP
I`ve been doing some CW contesting with my K2 and N3FJP`s Logging Software and since I now have this modern rig with computer control and everything I wanted to connect it up to my old Thinkpad and use the serial port for rig control and the parallel port for keying. Now, I`ve heard talk that you can run both rig control and keying off the same...
MikroC Pro for PIC driver routine for 74HC595 based serial LCD interface
Library routines for 3-wire LCD interface based on 74HC595 shift register. More details are provided in the attached ReadMe document or posted at Do you want to unsubscribe in order to stop receiving notifications regarding "MikroC Pro for PIC driver routine for 74HC595 based serial LCD interface " changes.
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 (
MARES IRIS Interface schematic circuit
You need a TSOP4156 which can be a tough one to get or expensive to buy. I had plenty of old BPW41 Infrared diodes so I decided to build my own receiver. The power comes from the RS232 port, make sure you have at least 5. 5 Volts or the 4001 will not oscillate well at 3. 6 MHz (Maybe you can get it to work at 5 Volts by adjusting some components.
This design is for PC Soundcards obviously. If you need an interface for a Mac see my other page. For other computers and PCs without a soundcard you might take a look at Harmony Central`s interface page. I have built one of these myself, exactly as described, so I know this design works. However, I make no promises that you will be able to do...
Arduino CAN Bus Interface
Implementation of CAN for use in aircraft. The protocol is called CAN-FIX and is a part of the MakerPlane Open Source Airplane project. You can get more information on CAN-FIX here. The idea for this project is to build an Arduino shield that will let it communicate over the CAN bus. I had some Microchip MCP2515 and MCP2551 (CAN Controller and...
Hammond Commodore MIDI Interface
Here is the schematic circuit board. Each switch puts out -2V when it`s on and 0V when it`s off. The four 4067 chips multiples the 64 switch signals into 4 signals that go back to the main PIC board.
Digital Capacitance Meter with RS232 interface circuit
Unlike almost all SMD resistors, the SMD ceramic capacitors are not marked with their values. To find the value of these capacitors we need a capacitance meter..
Custom USB tyre pressure monitoring interface
This threads explains how I`ve made my custom USB tyre pressure monitoring system by hacking this aftermarket kit bought on eBay. The first step was..
Mini USB-DMX interface
On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial tests on the cirquit: dmx_tx_test. zip (Microsoft VC7 project). The code configures the...
Two-channel Analog-to-Digital converter board with USB interface
build an interface board to connect some scientific equipment (for me, a pair of photovoltaic tubes) to a personal computer to acquire measurements results. Signal properties were following: two channels with a common ground, 1 second of acquisition time, max 10V signal level. Desired digitizing properties were about 1000 samples per...
IDE Hard Drive Interface
MIDI Drum Machine Schematic MIDI Interface
DS-300 Lap Counter with Optical Interface
FPGA / CPLD 16x2 LCD Interface Circuit
The schematic for this project is a modified version of the CPLD dev board schematic. There are a few new parts added for this project and you can see the completed schematic for this project below. The main parts in the schematic are the CPLD Dev Board, 16x2 LCD (HD44780) and ByteBlasterMV. The 16x2 LCD makes 11 digital I/O connections to the
FPGA RS232 Serial Interface Circuit
The schematic for this project is a modified version of the CPLD dev board schematic. There are a few new parts added for this project and you can see the completed schematic for this project below. The main parts in the schematic are the CPLD Dev Board, MAX233a and 7 Segment Display. The RS232 interface circuit consists of the CPLD, it`s 25. 17
Simple PIC USB Interface Circuit
Hardware design for USB is actually quite minimal, which is a big plus for us. However, what you quickly find out with USB is that the easy hardware design means the communication and control software is very complex, we`ll see more about that in the theory and software sections. The main devices used in the circuit are the PIC 18F4455, USB...
Simple RS232 Serial Interface Circuit
The circuit for the rs232 serial interface is of mild complexity. The main parts of the circuit are the 18F4520, MAX233A and DB-9 Connector and these portions of the circuit will be described briefly below. This is a basic +5v power regulator circuit for the digital signals/components. All components in this circuit use this regulated +5v for po
Wireless Interface RF Modules Circuit
The RF modules used in this schematic are very simple, with only a few extra pins required for power, ground and data. The main parts used in this schematic are the RF transmitter module, RF receiver module, 18F452 and 18F4520. You can see them below, as well as the specific circuits described in more detail. Since there are two seperate circu
Xbee Wireless Interface Circuit
The great thing about these little Xbee modules is they take care of almost all the heavy lifting. As you can see below both the transmitter and the receiver circuits are drop-dead simple. The main devices used in the circuit are the Xbee Modules, PIC 18LF452 and LM317. Both circuits use the same simple power regulation circuit with the LM317 f
KG6MVBs Rig to Computer interface
This page describes a modification that you plug in to your radio and computer. Do this at your own risk! It`s your choice to do this. I`m not forcing it on you. If you don`t, hey, no hard feelings, but if you do and mess something up, don`t blame me. This was designed and tested on an Icom 718 HF rig and a Dell laptop. This should work on any Ico
USB Interface Board Tutorial Using PIC18F4550
This project demonstrates a computer control interface using a USB Board. (USB INTERFACE PROJECT). This tutorial will show you a simple way to control some device like led, motors and other devices with computer through a USB Board. The traditional way to control devices from a computer was to use a parallel printer port which is much more easy to
DMX PC Keyboard Interface circuit
To be used with PC connected to video projectors, where the lighting controller may require control of a presentation on the video screen but the PC for the presentation is located in a different location to lighting control. The Hardware required for this project is quite simple see Circuit. The DMX data is converted inthe 75176 Bus Transceiver...
ACC FC-1 Remote Base Interface circuit
All of ACC`s repeater and remote base products support control of synthesized remote base transceivers. One form of frequency control supported is compatible with transceivers using thumbwheel frequency selection. The controllers supply BCD (binary coded decimal) formatted data in a serial bit stream, which may be captured by external shift regist
An ultra-low power RF interface for wireless-implantable microsystems
The current loop interface circuit diagram of AD694 being used as D / A converter
The current loop interface circuit diagram of AD694 multi-functional sensor signal conditioner being used as D / A converter. The current loop interface of AD694 being used as D / A converter (DAC) can achieve the conversion of digitalvalue †’voltage signal †’current signal. DAC`s current loop interface circuit is shown as the chart. AD566A is
The current loop interface of D/A converter (1B22 isolated programmable voltage/current sensor)
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...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial