Quick view 20-Watt 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. MSRP: Was: Now: $19.95 Add to Cart
Quick view 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. MSRP: Was: Now: $59.95 Add to Cart
Quick view 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... MSRP: Was: Now: $120.00 Add to Cart
Quick view 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... MSRP: Was: Now: $13.95 Add to Cart
Quick view Blinking LEDs Kit When you want the attention you deserve, put this kit on your shirt, but you have to assemble and test it! This kit demonstrates how to blink 2 LEDs with common electronic components, i.e. transistors, capacitors, resistors. Requires 9VDC battery. MSRP: Was: Now: $3.95 Add to Cart
Quick view Continuity Tester with Electric Buzzer and LED Light Assembled Demo Teacher demo unit is assembled and tested. When troubleshooting a circuit, this kit would be a great tool to test for continuity in a circuit. It has a LED light and built-in electric buzzer for a clear audible sound. PC board measures 1-1/2 x... MSRP: Was: Now: $59.95 Add to Cart
Quick view Continuity Tester with Electric Buzzer and LED Light Bulk Pack Bulk Pack of 20 Kits As Low As $4.95 Per Kit This is a real test instrument! Don't be fooled by the low price. KELVIN® is making this kit affordable for all. When troubleshooting a circuit, this kit would be a great tool... MSRP: Was: Now: $99.00 Add to Cart
Quick view Continuity Tester with Electric Buzzer and LED Light Kit This is a real test instrument! Don't be fooled by the low price. KELVIN® is making this kit affordable for all. When troubleshooting a circuit, this kit would be a great tool to test for continuity in a circuit. It has a LED light and built-in... MSRP: Was: Now: $7.95 Add to Cart
Quick view Continuity Tester with LED Light Bulk Pack Bulk Pack of 20 Kits As Low As $2.95 Per Kit This is a real test instrument! Don't be fooled by the low price. KELVIN® is making this kit affordable for all. When troubleshooting a circuit, this kit would be a great tool... MSRP: Was: Now: $88.50 Add to Cart
Quick view Continuity Tester with Mechanical Buzzer and LED Light Bulk Pack Bulk Pack of 20 Kits As Low As $4.95 Per Kit This is a real test instrument! Don't be fooled by the low price. KELVIN® is making this kit affordable for all. When troubleshooting a circuit, this kit would be a great tool... MSRP: Was: Now: $99.00 Add to Cart
Quick view Decision Maker Kit When you have to make a decision of "YES" or "NO" , "Heads or Tails", make your life simple and get the KELVIN® Electronic Decision Maker. Requires 9VDC battery. Kit. MSRP: Was: Now: $3.95 Add to Cart
Quick view Decision Stick Kit Push the button to display the answers to your questions. Requires a 9V battery. MSRP: Was: Now: $9.95 Add to Cart
Quick view Function Generator Kit This function generator kit is a piece of test equipment for an electronic technician or hobbyist. Produces sine, triangle and square waveforms with frequency range between 100Hz to 100KHz. Also has an amplitude adjustment. Requires a 9V battery. MSRP: Was: Now: $18.95 Add to Cart
Quick view KELVIN® Audio Amplifier Booster - Assembled Demo 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. Teacher Demo Unit, Assembled/Tested. MSRP: Was: Now: $59.95 Add to Cart
Quick view KELVIN® "Simon Says" Brain Game Kit Just 4 LEDs and 4 push buttons provide hours of fun. The aim-of-the-game is to repeat a pattern, which is generated at random. Low power consumption. Micro-processor controlled. Auto power off. Requires [4] AA batteries. Kit. Also check out... MSRP: Was: Now: $14.95 Add to Cart
Quick view KELVIN® 2-Way Intercom Assembled Demo This high quality intercom has good to excellent sound quality and is easily one of the finest systems in the educational field. Includes a pair of intercoms, project boxes, one pair of wires and batteries. Teacher Demo Unit, Assembled/Tested. MSRP: Was: Now: $69.95 Add to Cart
Quick view 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. MSRP: Was: Now: $69.95 Add to Cart
Quick view 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... MSRP: Was: Now: $160.00 Add to Cart
Quick view 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... MSRP: Was: Now: $21.95 Add to Cart
Quick view 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... MSRP: Was: Now: $15.95 Add to Cart
