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FlashProg is USB base flash memory programmer to work with 3.3V serial flash memory devices. This programmer is specifically design to read, program and configure 25x series, serial flash memory devices which are commonly used to store BIOS in PC mainboards. Originally we design this project to read and program BIOS of Foxconn G31MXP mainboard. Our version of G31MXP contains Macronix MX25L8005 8M-Bit serial flash memory and we use this programmer to load some of our custom BIOS to this serial memory. [ ]

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 eventually leads to excessive contact wear in the USB connector. The answer is to build this electronic isolator which disconnects the peripheral device at the touch of a button. This is guaranteed to reduce any physical wear and tear and restore calm once again to the workplace.  Circuit image :   USB Switch Schematic Circuit Image The circuit uses a quad analogue switch type 74HC4066. Two of the switches in the package are used to isolate the data path. The remaining two are used in a classic bistable flip-flop configuration which is normally built using transistors. A power MOSFET switches the power supply current to the USB device....

USB connector there are only 2 kinds, namely the connector type A and type B connector, as shown below. Type A connector used to connect the USB cable into the USB terminal on the back of the computer the last few years of production. Type B connector used to connect the USB cable into the USB terminal on the equipment, for a simple USB devices, such as mouse, usually do not use the connector B, to save cost in the cable directly connected to the inside of the mouse. Specified in the standard reference pesyaratan very strict to USB cable, not just the cable can be used, all the more for USB full-speed transfer of data to 1.2 Mega bps. So that the USB cable always sold as a ready-made, one end attached to the connector type A and the other end attached to the connector type B, no one sells it off the USB connector. On the computer, usually there are two terminals for connector type A, so it can easily be paired with 2 pieces of USB devices. Manufacturing company that makes the ...

When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc.) often have to be turned on and off as well. By using the 5-V supply voltage from the USB interface on the PC, all these peripherals can easily be switched on and off at the same time as the PC. This principle can also be used with other appliances that have a USB interface (such as modern TVs and radios).  USB Standby Killer Circuit Diagram : This so-called ‘USB-standby-killer’ can be realised with just 5 components. The USB output voltage provides for the activation of the triac-opto driver (MOC3043) which has zero-crossing detection. This, in turn, drives the TRIAC, type BT126.  The circuit shown is used by the author for switching loads with a total power of about 150 W and is protected with a 1-A fuse. The circuit can easily handle much larger loads however. In that case and/or when using a very inductive load a so-called snub-ber network is required across the triac. The val...

Britania Fame 240USB - Home Theater – SV VCD THEATER FAMA 240 - SMPS and AMP Circuit Diagram Used semiconductors:  MP7742-2X15W – SHT600A – FSDM0565 SUBWOOFER - CENTER - SURROUND - FRONT LEFT and RIGHT Amplifier - schematic PRE-AMP SMPS (Power) Click on the circuit diagrams to zoom in

I am quite sure that by now, many of us have already amassed quite a collection of USB flash drives over the months and years that have gone by. Hardly any conference or road show is devoid of a USB flash drive which more often than not contains the press release of a particular company, or a portfolio of new products. Having said that, it can be pretty difficult trying to keep track of just where exactly have you placed that particular file over in the myriad of USB flash drives that you have in your collection, and instead get a personal USB flash drive for yourself so that you can keep personal things private and secure. Just in case you are in the market scouting for a new USB flash drive, have you considered checking out the Mushkin Atom 3.0? The Mushkin Atom 3.0 USB flash drive will place plenty of emphasis on convenience, where it comes in an extremely small form factor which is slightly less than the size of your average quarter. All of this without having to sacrifice on perfo...

This is 5V 3A power supply to drive two USB based devices simultaneously. This power supply is design around LM2576-5.0 switching regulator IC and the main reasons to choose this IC is its low parts count, small heat sink requirements and its inbuilt current limit protection feature. We specially design this power supply to work with development boards / single board computer (SBC) platforms such as Raspberry Pi, Banana Pi, BeagleBone, etc. This power supply can also be used to provide power to USB OTG peripherals over USB Y cables. We test this setup and got successful results with Huawei Ascend P6 mobile phone. [ ]

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 eventually leads to excessive contact wear in the USB connector. The answer is to build this electronic isolator which disconnects the peripheral device at the touch of a button. This is guaranteed to reduce any physical wear and tear and restore calm once again to the workplace. Circuit image :   USB Switch Schematic Circuit Image The circuit uses a quad analogue switch type 74HC4066. Two of the switches in the package are used to isolate the data path. The remaining two are used in a classic bistable flip-flop configuration which is normally built using transistors. A power MOSFET switches the power supply current to the USB device.  Capacitor ...

This circuit is a 5v to 12 DC-DC step-up converter circuit which is specially ideal for the usb powered applications. A usb has two current supply modes.Before deecting the connected device the maximum supplies is 100mA to the load.when recognizing device its increases the output current up to 500mA.the controller (LT1618) also provides two input currents modes 100mA and 500mA which is selected by the user. Output currents are limited due to the increased potential difference at the output. When the demand of the load increases, output voltage will start to decrease. For example, if the circuit operates in the 100 mA input mode, when the load is 35 mA, the output voltage will be kept at 12V. But if the load increases to 50 mA, output voltage will reduce to 8V to maintain the constant 100 mA input current.

Eridani is a LM3S3651 based general purpose development board with USB Host/Device/OTG. You can buy one here. This documentation should help you use it effectively. All of the details on how to setup toolchains for this board are filed under getting started. [ ]

This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to be powered from a computer’s USB port. The 555 timer (IC1) is configured as a free-running oscillator, with a frequency of about 6.5kHz. The output of the timer drives four 100nF capacitors and 1N4148 diodes wir-ed in a Cockroft-Walton voltage multiplier configuration. USB-Powered PIC Programmer Circuit diagram: USB-Powered PIC Programmer Circuit Diagram The output of the multiplier is switched through to the MCLR/Vpp pin of the PIC during programming via a 4N28 optocoupler. Diodes ZD1 and D5 between the MCLR/Vpp pin and ground clamp the output of the multiplier to about 13.6V, ensuring that the maximum input voltage (Vihh) of the PIC is not exceeded. A 100kΩ resistor pulls the pin down to a valid logic low level (Vil) when the optocoupler is not conducting. The circuit is compa...

Now you can charge your Mobile Phone from the USB outlet of PC This simple circuit can give regulated 4.7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3.6 volts at 1000 to 1300 mAh. These battery packs have 3 NiMh or Lithium cells having 1.2 volt rating. Usually the battery pack requires 4.5 volts at 300-500 mA current for fast charging. But low current charging is better to increase the efficiency of the battery. The circuit described here provides 4.7 regulated voltage and sufficient current for the slow charging of the mobile phone. Transistor Q1 is used to give the regulated output. Any medium power NPN transistor like CL100, BD139, TIP122 can be used. Zener diode D2 controls the output voltage and D1 protects the polarity of the output supply. Front end of the circuit should be connected to a A type USB plug. Connect a red wire to pin1 and ...

USB Battery Charger For Lithium Ion battery with the LM3622 is a series of lithium ion battery charger. This charger circuit operates using power from the USB source PC. Current consumption of a series of USB Battery Charger For Lithium Ion battery with 400mA LM3622 is limited by R1, so it does not exceed the current maximum limit that can be given by a USB computer. Brains from USB Battery Charger For Lithium Ion battery with IC LM3622 , it is a national of having special technical specification charger for lithium ion batteries. In a series of USB Battery Charger For Lithium Ion with LM3622 R1 0.25 Ohm value that serves to limit the charging current 400mA to the battery. Q2 and Q1 is the last part of the USB Battery Charger For Lithium Ion battery with the LM3622. In principle, USB Battery Charger For Lithium Ion with LM3622 identify the condition of the battery full charged battery voltage via pin 6 LM3622. USB Series Lithium Ion Battery Charger For LM3622 is equipped with a switch ...

This USB charger circuit is designed using the MAX1555 IC circuit manufactured by Maxim Semiconductor This MAX1555 USB charger can be used using the USB power or AC power.This MAX1555 charger is charging at 100mA from USB port and the maximum charging current increases to 350mA if the USB the AC adapter is connected . If both power types are connected in the same time the AC adapter is automatically given precedence.  USB Charger Circuit diagram This charger can be used for small devices like : PDAs ,Cell Phones , Digital Cameras , MP3 Players and other.The charger can be used for Li-Ion or Li-Polymer batteries . The electronic project charger circuit require a input voltage between 3V and 7 V and deliver an 3.3 V output voltage.As you can see in the circuit diagram , before the IC is connected the MAX8881 linear regulator IC which is capable to deliver up to 200mA.The MAX1881 is specially designed for battery-powered applications where reverse battery protection and long battery ...

The AVR Stick is a simple data logging device that instantiates itself as an HID keyboard and reports the voltages, along with a ‘timestamp,’ from two pins on an ATtiny85. The device uses open source firmware availabe from Objective Development (http://www.obdev.at/vusb/) called V-USB to implement the USB 1.1 standard. The code that runs the application was based on the EasyLogger example application from Objective development. [ ]

The tool that I made and I discuss in this article I give the name USB SPDIF DACEvery word in the name corresponds to the function of the tool that I made this. USB, this device serves to take the music information in digital form from a computer via the USB port SPDIF, this tool can output digital music information received through the USB port, through the SPDIF output terminal that is also present in this device, so if you have a DAC that does not have a USB input, you can still use and do not need to buy a new DAC that has an input USB. DAC, this tool can convert the digital signals derived from the USB port, an analog signal, which you can connect to the amplifier to the ahirnya you can hear the speaker Scheme of the USB DAC can be seen in Figure 1 below. Click to view larger. | Figure 1 As you can see on the schematic in Figure 1 above, which is the heart of the circuit is IC USB DAC PCM2902 made ​​by Texas Instrument, other than that I also added a digital SPDIF output isolation...

Power shortage problems arise when too many USB devices connected to PC are working simultaneously. All USB devices, such as scanners, modems, thermal printers, mice, USB hubs, external storage devices and other digital devices obtain their power from PC. Since a PC can only supply limited power to USB devices, external power may have to be added to keep all these power hungry devices happy. This circuit is designed to add more power to a USB cable line. A sealed 12V 750 mA unregulated wall cube is cheap and safe. To convert 12 V to 5 V, two types of regulators, switching and linear are available with their own advantages  and drawbacks. USB Power Booster Circuit Diagram The switching regulator is more suitable to this circuit because of high efficiency and compactness and now most digital circuits are immune to voltage ripple developed during switching. The simple switcher type LM2575-5 is chosen to provide a stable 5V output voltage. This switcher is so simple it just needs three...