KELVIN® Electronics Kits
  • KELVIN® 20 Watt Audio Amplifier Assembled Demo

    KELVIN® 20 Watt 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
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  • KELVIN® 20 Watt Audio Amplifier Bulk Pack

    KELVIN® 20 Watt Audio Amplifier Bulk Pack

    Bulk Pack of 10 Kits 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 Watt Audio Amplifier Kit

    KELVIN® 20 Watt 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
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  • KELVIN® 20+20 W Stereo Audio Amplifier

    KELVIN® 20+20 W Stereo Audio Amplifier

    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...

    $21.95
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  • KELVIN® 20+20 W Stereo Audio Amplifier Assembled Demo

    KELVIN® 20+20 W Stereo Audio Amplifier Assembled Demo

    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...

    $69.95
    Add to Cart
  • KELVIN® 3D Christmas Tree Kit

    KELVIN® 3D Christmas Tree Kit

    This kit features 32 LEDs that can either blink in pattern or light up the whole board with the use of two switches. Easy assembly by sliding the two boards together onto the bottom board (where major components are soldered). Requires 9V...

    $15.95
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  • KELVIN® Audio Amplifier Booster Bulk Pack

    KELVIN® Audio Amplifier Booster Bulk Pack

    Bulk Pack of 20 Kits As Low As $5.45 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. 

    $109.00
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  • KELVIN® Audio Amplifier Booster Kit

    KELVIN® Audio Amplifier Booster Kit

    Amplifies music from a portable CD player, audio project, or any audio signal up to 1W and relays it to an 8? speaker with volume control (speaker included). Requires 9V DC Battery.

    $6.95
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  • KELVIN® Audio Level Meter Assembled Demo

    KELVIN® Audio Level Meter Assembled Demo

    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. Teacher Demo Unit, Assembled/Tested.

    $59.95
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  • KELVIN® Audio Level Meter Bulk Pack

    KELVIN® Audio Level Meter Bulk Pack

    Bulk Pack of 10 Kits As Low As $12.00 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...

    $120.00
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  • KELVIN® Audio Level Meter Kit

    KELVIN® Audio Level Meter Kit

    The louder the sound, the more the LEDs will light. This kit uses the LM3915 Bar Graph IC and an audio pre-amplifier stage to measure an audio level. It has a sensitivity adjustment to increase or decrease the microphone sensitivity level. Requires 9VDC...

    $13.95
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