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Mini Hidden Spy Digital Audio Voice Activated Recorder MP3 Playback Small Smart For Sale

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Mini Hidden Spy Digital Audio Voice Activated Recorder MP3 Playback Small Smart :
$23.99

Package Content:

1 x 8GB Voice Recorder

1 x Earphone

1 x USB Cable

1 x User Manual

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Mini Hidden Spy Digital Audio Voice Activated Recorder MP3 Playback Small Smart

$23.99

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Mini Hidden Keychain Audio Recorder Voice Activated Listening Device MP3 Player

$26.95

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32gb Spy Digital Voice Activated Recorder Mini Hidden Audio Recording Pen Device

$21.99

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Popular Tutorials

Alarms and Indicator Circuit diagrams

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Audio electronic circuits list

• Stereo Channel Selector
• Low cost intercom using transistors
• Infrared Head Phones
• Use the CD-ROM drive as a audio CD player without the computer
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• Ultrasonic pest repellent

Circuits for Cars/Motorcycles

• Charge Monitor for 12V lead acid battery.
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Computer/PC Hardware Circuits :

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• Simple Analog to Digital Converter
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Design Ideas :

• Soft ON/OFF switch

Fun/Games Circuits :

• Electronic Scoring Game
• JAM(Just A Minute) Circuit
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Signal/Sequence/Misc. Generators :

• Simple IF Signal Generator

Home/Garden related Circuits :

• Ultrasonic Pest Repeller
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Lights & LED Circuits :

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• Running Message Display

Motor Circuits :

• Automatic Speed Controller for fans & Coolers
• Soft Button type Motor Direction Controller
• Super simple stepper motor controller
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Music related Circuits :

• Digital Volume Control
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< Oscillator Circuits :

• Simple variable frequency oscillator
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Power Supply (PS) Circuit diagrams :

• Negative supply from single positive supply
• Self switching Power Supply
• Ultra low drop linear voltage regulator

Radio,transmitter,receiver circuits :

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• Remote control using VHF modules
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Remote Control Circuit diagrams :

• Remote control using VHF modules
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• Clap Activated Remote
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Robotics related Circuits :

• Magnetic proximity sensors
• Color Sensor
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Sensors :

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• Metal Detector
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Telephone Circuit diagrams :

• Telephone Ringer using 556 dual timers
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Test & Measurement Circuits :

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