KELVIN® Electronics Kits
  • KELVIN® 20 W Audio Amplifier Kit

    KELVIN® 20 W Audio Amplifier Kit

    This kit contains all the parts necessary to build a 20W Mono Hi-Fi Amplifier using a LM1875 to amplify any small signal and to drive an 8 ohm speaker with 1% THD. Requires a 12-30 Volt DC power supply.

    $19.95
    Add to Cart
  • KELVIN® 20 W Audio Amplifier Bulk Pack

    KELVIN® 20 W Audio Amplifier Bulk Pack

    Bulk Pack of 10 - As Low As $16.00 Per Kit! All the parts necessary to build a 20W Mono Hi-Fi Amplifier using a LM1875. Amplify any small signal and drive an 8 ohm speaker with 1% THD. Requires a 12-30 V DC power supply.

    $160.00
    Add to Cart
  • KELVIN® 20 W Audio Amplifier Assembled Demo

    KELVIN® 20 W Audio Amplifier Assembled Demo

    All the parts necessary to build a 20W Mono Hi-Fi Amplifier using a LM1875. Amplify any small signal and drive an 8 ohm speaker with 1% THD. Requires a 12-30 V DC power supply. Teacher Demo Unit, Assembled/Tested.

    $69.95
    Add to Cart
  • KELVIN® 20+20 W Stereo Amplifier Kit

    KELVIN® 20+20 W Stereo Amplifier Kit

    A high quality stereo audio amplifier which operates from a 12-30 Volt DC power supply. This kit contains all the parts necessary to build a 20+20 Watt stereo Hi-Fi Amplifier using a LM1875 to amplify any small signal and to drive an 8 ohm speaker with 1...

    $31.95
    Add to Cart
  • KELVIN® 20+20 W Stereo Amplifier Assembled Demo

    KELVIN® 20+20 W Stereo Amplifier Assembled Demo

    A high quality stereo audio amplifier which operates from a 12-30 V DC power supply. This kit contains all the parts necessary to build a 20+20 Watt stereo Hi-Fi Amplifier using a LM1875 to amplify any small signal and to drive an 8 ohm speaker with 1%...

    $69.95
    Add to Cart
  • KELVIN® Wireless Microphone Kit

    KELVIN® Wireless Microphone Kit

    While building this kit, students learn about microphones, audio amplifiers, RF oscillators and how FM radio works. Transmit your voice or sing to any FM radio up to 100 feet away! Includes instructions and handheld housing made from a PCV pipe. Kit...

    $29.95
    Add to Cart
  • KELVIN® Wireless Microphone Bulk Pack

    KELVIN® Wireless Microphone Bulk Pack

    Bulk Pack of 10 - As Low As $26 Per Kit! Build this kit and learn about microphones, audio amplifiers, RF oscillators and how an FM radio works. Transmit your voice or sing to any FM radio up to 100 feet away. Includes instructions and handheld housing...

    $260.00
    Add to Cart
  • KELVIN® Wireless Microphone Assembled Demo

    KELVIN® Wireless Microphone Assembled Demo

    Build this kit and learn about microphones, audio amplifiers, RF oscillators and how an FM radio works. Transmit your voice or sing to any FM radio up to 100 feet away. Includes instructions and handheld housing made from a PCV pipe. Requires a 9V...

    $69.95
    Add to Cart
  • KELVIN® PaceMaker™ Kit

    KELVIN® PaceMaker™ Kit

    Assemble this kit to create a device that will pace your speed when walking or jogging. Attach to belt for use. Ideal as a gift. Requires [2] AA batteries. Kit.

    $13.95
    Add to Cart
  • KELVIN® PaceMaker™ Bulk Pack

    KELVIN® PaceMaker™ Bulk Pack

    Bulk Pack of 10 - As Low As $12 Per Kit! Assemble KELVIN®'s PaceMaker to create a device that will pace your speed when walking or jogging. Attach to belt for use. Ideal as a gift. Requires [2] AA batteries.

    $120.00
    Add to Cart
  • KELVIN® PaceMaker™ Assembled Demo

    KELVIN® PaceMaker™ Assembled Demo

    Assemble to create a device that will pace your speed when walking or jogging. Attach to belt for use. Ideal as a gift. Requires [2] AA batteries. Teacher Sample, Hand Assembled.

    $49.95
    Add to Cart
  • KELVIN® Reaction Tester Kit

    KELVIN® Reaction Tester Kit

    A fun electronic game to play with, either by yourself or with friends. By building and using this kit, the reaction of anyone can be tested. The object of this game is to anticipate when the LED will light up and to release the switch at that exact...

    $3.95
    Add to Cart
  • KELVIN® Reaction Tester Bulk Pack

    KELVIN® Reaction Tester Bulk Pack

    Bulk Pack of 30 - As Low As $3.30 Per Kit! A fun electronic game to play with, either by yourself or with friends. By building and using this kit, the reaction of anyone can be tested. The object of this game is to anticipate when the LED will light up...

    $99.00
    Add to Cart
  • KELVIN® Reaction Tester Assembled Demo

    KELVIN® Reaction Tester Assembled Demo

    A fun electronic game to play with, either by yourself or with friends. By building and using this kit, the reaction of anyone can be tested. The object of this game is to anticipate when the LED will light up and to release the switch at that exact...

    $49.95
    Add to Cart
  • KELVIN® Decision Maker Kit

    KELVIN® Decision Maker Kit

    When you have to make a decision of YES, NO, or Heads or Tails, make your life simple and get the KELVIN® Electronic Decision Maker. Requires 9VDC battery. Kit.

    $3.95
    Add to Cart
  • KELVIN® Decision Maker Bulk Pack

    KELVIN® Decision Maker Bulk Pack

    Bulk Pack of 30 - As Low As $3.30 Per Kit! Whenever you have to make a YES, NO, or a Heads or Tails decision, make your life simple and build the Electronic Decision Maker. The kit includes all parts. Requires a 9V battery.

    $99.00
    Add to Cart
  • KELVIN® Decision Maker Assembled Demo

    KELVIN® Decision Maker Assembled Demo

    Whenever you have to make a YES/NO or a Heads/Tails decision, make your life simple and build the Electronic Decision Maker. The kit includes all parts. Requires a 9V battery. Teacher Demo Unit, Assembled/Tested.

    $49.95
    Add to Cart
  • KELVIN® Decision Stick Bulk Pack

    KELVIN® Decision Stick Bulk Pack

    Bulk Pack of 20 - As Low As $7.45 Per Kit! Push the button to display the answers to all of your questions. Requires a 9V battery. Does not include enclosure.

    $149.00
    Add to Cart
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