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September 27, 2010
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... [more]
circuit from:http://www.extremecircuits.net/2010/05/usb-fuse.html
September 27, 2010
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... [more]
circuit from:http://www.extremecircuits.net/2010/05/usb-operated-home-appliances.html
September 27, 2010
In fact, the device is powered from two USB ports, since one port is incapable of supplying sufficient current. That’s done using a special USB cable that’s supplied with the drive. It has two connectors... [more]
September 27, 2010
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... [more]
September 27, 2010
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... [more]
circuit from:http://www.extremecircuits.net/2010/05/usb-switch-for-printers.html
September 27, 2010
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... [more]
circuit from:http://www.extremecircuits.net/2010/05/usb-power-socket-with-indicator.html
September 27, 2010
This circuit has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an... [more]
September 27, 2010
This i-TRIXX circuit can prevent a whole lot of trouble for those of you who go on holiday in a caravan. It would be a significant damper on your holiday spirit when you are ready... [more]
circuit from:http://www.extremecircuits.net/2010/04/battery-indicator-circuit-for-caravan.html
September 27, 2010
Connecting this circuit to the battery of your vehicle, you will always know at a glance the approximate voltage available. An indication of battery voltage is useful to the motorist for monitoring the battery's capacity... [more]
circuit from:http://www.extremecircuits.net/2009/08/battery-voltage-indicator-circuit.html
September 27, 2010
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be... [more]
circuit from:http://www.extremecircuits.net/2009/12/cellular-phone-calling-detector-circuit.html
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