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Solar Cell Circuits
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Switching Power Supplies
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Data Bus Circuits
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8051 / 8052
PCB CAD Software
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Remote Control Toy
H Bridge Circuit
Interconnection & Timing
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Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
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USB Interface Circuits
USB Interface Circuits
USB FM Transmitter Circuit
A simple USB FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio by connecting it to an USB port. The circuit use no coils that have to be wound. This USB transmitter can be used to listen to your own music throughout your home. To keep the fm transmitter circuit simple as well as
USB Cellphone Charger circuit
You can charge your Mobile Phone from the USB outlet of PC. This simple usb cellphone charger circuit can give regulated 4. 7 volts for charging the mobile phone. USB outlet can give 5 volts DC and 100 mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone battery is rated 3. 6 volts at 1000 to 1300 mAh.
USB Reading Lamp Circuit
Light your table top with this cool White LED Lamp. It is powered from the USB port and is ideal to take notes while browsing internet. The USB port can pr..
USB DC Power Supply from Cigar Lighter Socket
The diagram shows the circuit of a versatile USB power socket that safely converts the 12V battery voltage into stable 5V. This circuit makes it possible t..
USB Game-pad and Mouse With Accelerometer
Tutorial Famicom USB Controller
USBStickLogger - USB thumb drive logger for serial data - fischl.de
Default setting for the UART is 9600 baud, 1 start bit, 1 stop bit, no parity. You can configure this paramter by placing the file "CONFIG. TXT" to the USB thumb drive. Currently only the baudrate can be configured. Example: Once the device is connected and correctly configured, all incoming characters on the serial interface are written to the fi
USB As A Power Source
The Universal Serial Bus (USB) has become a popular method of connecting computer peripherals. The original USB 1. 1 specification limited data rates to about 12 Mbits/sec. The updated USB 2. 0 spec increases those rates to up to 480 Mbit/sec. Both versions of USB can provide DC power to peripheral devices. This power form is the subject of this...
The Itsy-Bitsy USB Lamp circuit
We`ve called it the Itsy Bitsy USB Lamp. It is such a delightfully simple idea we`re wondering why no-one ever thought of it before. It started life (and continues) as a student project at Massey University in Wellington, New Zealand - and in fact was submitted to us by the lecturer, Stan Swan. When we say simple, we mean it: just a USB plug on...
USB Printer Share Switch Circuit
This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate the selected PC..
USB Switch For Printers circuit
This circuit switches a printer s USB connection from a PC to a laptop. What was needed was a method of allowing a laptop to use the printer occasionally while at all other times the printer would be connected to the PC. Instead of unplugging the printer from the PC and then into the laptop, the circuit switches the USB connection automatically....
Usb Power Socket With Indicator circuit
Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 100 mA of continuous current at 5V to the peripherals that are connected to the bus. So a USB port can be used, without any trouble, for powering 5V DC operated tiny electronic gadgets. Nowadays, many handheld...
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...
USB Data Acquisition
The Universal Serial Bus (USB) has become a ubiquitous technology for computer peripherals. It is available on virtually every new computer and in most cases provides a seamless connection method for a variety of consumer electronics devices such as digital cameras, scanners and printers. This ease of connection together with the inherent high dat
My projects typically involve many LEDs and microcontrollers. However sometimes I just love the simplest of things with LEDs. One of the very basic L..
USB Host and Device
The DE2 board provides both USB host and device interfaces using the Philips ISP1362 single-chip USB controller. The host and device controllers are compliant with the Universal Serial Bus Specification Rev. 2. 0, supporting data transfer at full-speed (12 Mbit/s) and low-speed (1. 5 Mbit/s). Figure 1 shows the schematic diagram of the USB...
MAX3420 Maxim USB Peripheral Controller
The MAX3420 is a USB peripheral controller chip with an SPI bus. This page hopefully contains enough information to help you easily make use of the device in your projects. The MAX3420 provides a very simple approach to adding a USB interface to a circuit. It uses a SPI bus to connect to your system. It does require a reasonable amount of configur
The Itsy-Bitsy USB Lamp
It plugs into the USB port and is just the shot for checking motherboard switch and jumper settings. Many readers will remember a commercial product of a few years ago, the "Itty Bitty Book Light". It was designed to clip over the top of a book to give just a tiny light on the page when, for example, you were reading in bed and didn`t wish to dist
Low-Power Car/Bike USB Charger
We tested a regular charger and found that it consumed 13mA with no load. Like many others, it has an integrated power LED and that would contribute significantly to the standby current consumption. However, since the cigarette lighter socket is only powered when the engine is running, there is no real reason for the designers of these car supplie
Power Supply For USB Devices
More and more equipment is sold that runs off internal rechargeable batteries. Although a matching charger is usually supplied in the package, there are also devices that can only be charged via a USB port. That is not surprising in the case of USB MP3 players, which have to dock` in the PC anyway for some time for the purpose of file transferring
Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials - take for example the USB powered teacup warmer; this device is obviously an invaluable productivity tool for all users but it could prove a little tire some if the extra current it draws from the USB port is suffic
USB Powered Audio Power Amplifier
This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This IC is, in fact, mono-lithic type in 8-lead mini DIP package. It is intended for use as a dua
USB Switch For Printers
This circuit switches a printer`s USB connection from a PC to a laptop. What was needed was a method of allowing a laptop to use the printer occasionally while at all other times the printer would be connected to the PC. Instead of unplugging the printer from the PC and then into the laptop, the circuit switches the USB connection automatically. K
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
USB phone charger
A portable phone charger for a Siemens mobile phone. Since I don`t use that phone anymore and recent phones can usually be charged with a USB connector I built a new version of the charger. This time with a proper PCB, a USB connector and a higher current capability. Just as the previous charger it is basically just a step-up conve
Improving USB 2.0 Switched-System Response
By adding discrete inductors in series with the device, we can œtune out some of the capacitance, and improve the eye opening. If we add enough inductance to peak the 3rd harmonic of 240 MHz, with the capacitance of the device and any added board capacitance, we won t affect the lower frequencies much, and we ll enhance the performance where we...
car cigar lighter to usb power socket circuit
A USB port, in practice, is capable of supplying more than 100 mA of continuous electric current at 5V to the peripherals which are hooked up with the bus. So a USB port could be utilized, without having any problems, for powering 5V DC operated tiny electronic devices. Today, a lot of handheld gadgets (for example, portable reading lamps)...
simple usb avr isp compatible programmer
In the old days it was very simple to use the parallel port of a standard PC and program just about any type of AVR microcontroller with it. When you want to do that now, you`re first obliged to buy aprogrammer that communicates with the PC via USB, which immediately raises the threshold of getting started with these microcontrollers. The...
usb switch schematic circuit
Anyone experimenting or developing USB ported peripheral hardware soon be comes irritated by the need to disconnect and connect the plug in order to reestablish communication with the PC. This process is necessary for example each time the peripheral equipment is reset or a new version of the firmware is installed. As well as tiresome it eventuall
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..
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...
Computer 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