Laptop and Notebook Repair and Troubleshooting Tips
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Diagram circuit
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Negative Supply from single positive Supply
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Self switching Power Supply
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Ultra low drop linear voltage regulator
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Over / Under Voltage Cut-Out
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High and Low Voltage Cutout with delay and Music
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High Voltage, Low Current Supply
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Simple Car Battery Charger
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7 segment rolling display using PC
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PC based Frequency Meter
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Simple Analog to Digital Converter
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Sawtooth wave generator
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Simple variable frequency oscillator
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Discrete component motor direction controller
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Super simple stepper motor controller
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Discrete component motor direction controller
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Automatic Speed Controller for fans & Coolers
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Alternating Flasher
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Dancing Lights
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Switch using a single Chip
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Christmas Star
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Running Message Display
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Automatic Room Lights
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Emergency Light
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Automatic Dual output Display
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Pot plant water tester electronic
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Programmable Digital Code Lock
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Ultrasonic Pest Repeller
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Simple IF Signal Generator
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TV remote control Blocker
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Flashy Christmas Lights
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JAM(Just A Minute) Circuit
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Electronic Scoring Game
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Soft ON/OFF switch
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Control electrical appliances using PC
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Car anti theft wireless alarm.
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Dome light dimmer for Cars
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Wiper Speed Control
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Charge Monitor for 12V lead acid battery.
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Audio level meter (vumeter)
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Bass-treble tone control circuit
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Audio Light Modulator
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5 band graphic equalizer using a single IC/chip
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Digital Volume Control
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Ultrasonic Switch
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Sound Controlled Filp Flop
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Audio Visual Indicator for Telephones
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Use the CD-ROM drive as a audio CD player without ...
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Infrared Head Phones
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Low cost intercom using transistors
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Stereo Channel Selector
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Brakelight Flasher
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Melody generator for greeting cards
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Timed Burglar Alarm
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Infrared beam barrier/ proximity sensor
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Beeper
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Big Ben Sound
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Police Siren
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Factory Siren
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DayLight Alarm
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Fire Alarm
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Water Level Indicator with alarm
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A simple electronic buzzer ic
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Rain Alarm
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Power supply failure alarm
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