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Toshiba-Mini-notebook

Toshiba-Mini-notebook NB255-N245:

With a 10.1" widescreen, you'll have plenty of room to enjoy your favorite websites, photos and digital entertainment on-the-go. Video-chat with friends and family around world with a convenient built-in webcam and microphone. Empower yourself to share videos, music and pictures from your PC’s media library with any compatible home entertainment network minus hassles. Toshiba ReelTime replaces old fashioned "hunt-and-click" method of finding your files with an innovative timeline or "reel.

mini-notebook NB255-N245

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stepper motor controller

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sos.mathimatics

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Travel Touch Alarm

Diagram circuit:

The Travel Touch Alarm can be used to:
provide a audible alarm when someone touches the door knob or handle of your hotel room.

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The Sun - Up Alarm can be used to:
provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can also be used to detect a light beam, headlights etc.
The circuit works as follows. The phototransistor is very sensitive to light. (Any phototransistor will work fine) The sun shining on this device will provide a high to one of the NAND gates.
This will cause another NAND gate to oscillate which will drive another gate to output a 100hz tone. The transistor provides drive for the speaker.
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