Electronics Kit Bulk Packs
  • 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
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  • KELVIN® Audio Amplifier Booster Bulk Pack

    KELVIN® Audio Amplifier Booster Bulk Pack

    Bulk Pack of 20 - As Low As $7 Per Kit! Amplify music from a portable CD player or any audio signal up to 1W. Relays it to a speaker with volume control (speaker included). Requires a 9V battery.

    $140.00
    Add to Cart
  • KELVIN® Audio Level Meter Bulk Pack

    KELVIN® Audio Level Meter Bulk Pack

    Bulk Pack of 10 - As Low As $19.00 Per Kit! Uses an LM3915 Bar Graph IC and audio pre-amplifier stage to measure an audio level. The Meter includes a sensitivity adjuster to increase and decrease the mic's sensitivity level. Requires a 9V battery.

    $190.00
    Add to Cart
  • KELVIN® Bicycle Safety Light Bulk Pack

    KELVIN® Bicycle Safety Light Bulk Pack

    Bulk Pack of 10 - As Low As $9.99 Per Kit! Build this kit and connect it to your bicycle or place it on your table top or on the wall for a conversation piece. Requires [2] AA batteries. Does not include enclosure.

    $99.95
    Add to Cart
  • KELVIN® Big Ear Bulk Pack

    KELVIN® Big Ear Bulk Pack

    Bulk Pack of 10 - As Low As $16.00 Per Kit! Amplify sounds from different sources (far away, birds, conversations. Add a parabolic reflector and hear blocks away. This kit contains all parts necessary to build an ultra sensitive listening device. Use a...

    $160.00
    Add to Cart
  • KELVIN® Blinking LEDs Bulk Pack

    KELVIN® Blinking LEDs Bulk Pack

    Bulk Pack of 30 - As Low As $1.95 Per Kit! When you want the attention, put this kit on your shirt but first, you have to assemble and test it! This kit demonstrates how to blink two LEDs with common electronic components such as capacitors and resistors...

    $58.50
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  • KELVIN® Continuity Tester w/ Electric Buzzer Bulk Pack

    KELVIN® Continuity Tester w/ Electric Buzzer Bulk Pack

    Bulk Pack of 20 - As Low As $3.95 Per Kit! Don't be fooled by the low price - this is a real test instrument with Electric Buzzer and LED Light. When troubleshooting a circuit, this kit would be a great tool to test for continuity in a circuit. It has a...

    $79.00
    Add to Cart
  • KELVIN® Continuity Tester w/ LED Light Bulk Pack

    KELVIN® Continuity Tester w/ LED Light Bulk Pack

    Bulk Pack of 20 - As Low As $2.95 Per Kit! Don't be fooled by the low price - this is a real test instrument with LED light only. When troubleshooting a circuit, this kit would be a great tool to test for continuity in a circuit. Requires a 9 V DC...

    $88.50
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  • 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 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
  • KELVIN® Fiber Optic Alarm Chain Bulk Pack

    KELVIN® Fiber Optic Alarm Chain Bulk Pack

    Bulk Pack of 10 - As Low As $24.50 Per Kit! Design, Build and Test a Structure Wrap the fiber optic cord around a valuable possession. If the cord is cut, the relay will trigger your alarm circuitry (not included). The alarm can be de-activated or reset...

    $245.00
    Add to Cart
  • KELVIN® KGB Ear Bulk Pack

    KELVIN® KGB Ear Bulk Pack

    Bulk Pack of 10 - As Low As $9.99 Per Kit! For education purposes only. Listen to a clear broadcast over 100 ft. away by using any standard FM radio. Each kit includes: Pre-Drilled PC Board Parts Instructions Requires a 9V battery and an FM Radio.

    $140.00
    Add to Cart
  • KELVIN® Light Activated Circuit Bulk Pack

    KELVIN® Light Activated Circuit Bulk Pack

    Bulk Pack of 20 - As Low As $7.45 Per Kit! This kit uses a light to activate a relay that will trigger your alarm or your robotic system to operate. It has a built-in photocell, plus a relay and a potentiometer for sensitivity adjustment. Requires a 9V...

    $149.00
    Add to Cart
  • KELVIN® Metal Detector Bulk Pack

    KELVIN® Metal Detector Bulk Pack

    Bulk Pack of 10 - As Low As $12 Per Kit! This handy metal detector, detects metallic objects in or behind surfaces. Sensor is mounted on a wooden stick to minimize interference. Requires a 9V battery. Does not include enclosure.

    $120.00
    Add to Cart
  • KELVIN® Metal Stud Finder Bulk Pack

    KELVIN® Metal Stud Finder Bulk Pack

    Bulk Pack of 10 - As Low As $9.99 Per Kit! For education purposes only. Listen to a clear broadcast over 100 ft. away by using any standard FM radio. Each kit includes: Pre-Drilled PC Board Parts Instructions Requires a 9V battery and an FM Radio.

    $99.95
    Add to Cart
  • KELVIN® Micro-Mazer™ Bulk Pack

    KELVIN® Micro-Mazer™ Bulk Pack

    Bulk Pack of 20 - As Low As $3.95 Per Kit! The layout of components gives this kit a 'robotic face'. Blinking LED eyes give it a personality. Each kit includes: [2] blinking LEDs for eyes and a jumbo LED for a nose. Requires a 9V battery.

    $79.00
    Add to Cart
  • KELVIN® Moisture Sensor Bulk Pack

    KELVIN® Moisture Sensor Bulk Pack

    Bulk Pack of 20 - As Low As $7.45 Per Kit! Use this kit to check the soil moisture of plants and keep them alive! By placing probes in the potting soil of the plant, the moisture level is tested and a buzzer sounds if the level is low. Requires a 9V...

    $149.00
    Add to Cart
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