On eBay Now...

Transducer Ultrasonic 25khz (4 pieces) MK-109C 349 25 DIA X 20 MM For Sale

---

Transducer Ultrasonic 25khz (4 pieces) MK-109C 349 25 DIA X 20 MM :
$12.00

HELLO ERS , UP FOR "BUY IT NOW " ARE ULTRASONIC TRANSDUCERS MADE BY MASSA ,,, THESE ARE NEW OLD STOCK NOT USED,, YOU ARE BUYING IT NOW FOR 4 PCS,,, FREE GROUND SHIPPING IN USA . WE DON'T KNOW WHAT THE FREQUENCY IS FOR SURE , WE THINK THEY ARE 25 KHZ BECAUSE WE HAVE BEEN SELLING THEM FOR A WHILE ON AND A BUYER GOT BACK TO US THAT DID TESTING ON THE ONES HE BOUGHT AND HE SAID THEY ARE 25 KHZ? THERE IS A 349 STAMPED ON THE BACK OF THE TRANSDUCER AND ON THE BOX THEY CAME FROM IT SAYS MK-109C 42A THEY MEASURE 25MM IN DIA AND 20 HEIGHT NOT INCLUDING THE RCA PHONO FEMALE CONNECTOR THEY WERE MADE IN USA IN 280 LINCOLN STR HINGHAM , MASS .... THANK YOU FOR READING AND MESSAGE ME IF YOU HAVE ANY MORE QUESTIONS ...

---

---

---

US Stock 110VAC 60W 40KHz Ultrasonic Cleaning Transducer Cleaner & Driver Board

$50.53

---

60W 40KHz Ultrasonic Piezoelectric Transducer Cleaner High Conversion Efficiency

$16.14

---

HC-SR04 Ultrasonic Distance Measuring Transducer Sensor Module for Arduino

$5.19

---

Popular Tutorials

Alarms and Indicator Circuit diagrams

• Power supply failure alarm
• Theft preventer alarm
• Rain Alarm
• A simple electronic buzzer
• Water Level Indicator with alarm

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
• Audio Visual Indicator for Telephones
• Ultrasonic pest repellent

Circuits for Cars/Motorcycles

• Charge Monitor for 12V lead acid battery.
• Wiper Speed Control
• Dome Light Dimmer for Cars
• Car anti theft wireless alarm.

Computer/PC Hardware Circuits :

• Control electrical appliances using PC
• Simple Analog to Digital Converter
• PC based Frequency Meter
• 7 segment rolling display using PC

Design Ideas :

• Soft ON/OFF switch

Fun/Games Circuits :

• Electronic Scoring Game
• JAM(Just A Minute) Circuit
• Flashy Christmas Lights
• TV remote control blocker

Signal/Sequence/Misc. Generators :

• Simple IF Signal Generator

Home/Garden related Circuits :

• Ultrasonic Pest Repeller
• Programmable Digital Code Lock
• Pot plant water tester

Lights & LED Circuits :

• Light Flasher (blinking lights)
• Automatic Dual output Display
• Emergency Light
• Automatic Room Lights
• Running Message Display

Motor Circuits :

• Automatic Speed Controller for fans & Coolers
• Soft Button type Motor Direction Controller
• Super simple stepper motor controller
• Discrete component motor direction controller

Music related Circuits :

• Digital Volume Control
• 5 band graphic equalizer

< Oscillator Circuits :

• Simple variable frequency oscillator
• Sawtooth wave generator

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 :

• Car anti theft wireless alarm.
• Long range FM transmitter
• Remote control using VHF modules
• 40 meter Direct Conversion Receiver

Remote Control Circuit diagrams :

• Remote control using VHF modules
• Remote control using telephone
• A simple Remote control Tester
• Clap Activated Remote
• Radio Remote Control using DTMF
• Ultrasonic switch

Robotics related Circuits :

• Magnetic proximity sensors
• Color Sensor
• Super simple stepper motor controller

Sensors :

• Magnetic proximity sensors
• Dew sensor
• Color Sensor
• Metal Detector
• Optical toggle switch using a single Chip

Telephone Circuit diagrams :

• Telephone Ringer using 556 dual timers
• Two line intercom plus a telephone changeover switch
• Telephone line based audio muting and light on circuit
• Having secrecy in parallel telephones
• Telephone call meter using calculator & COB

Test & Measurement Circuits :

• High Resistance Voltmeter
• A simple Remote control Tester
• Contactless Mains Voltage Indicator
• Zener Diode Tester