27mm Brass Piezo Discs with 3 contacts
These are perfect for constructing contact mics, CBG pickups, touch-sensors, drum triggers, speakers, buzzers, etc
Picture Illustration: (comparision)
Note: The 3rd lead is Feedback Electrode (Hartley Oscillator..
BMP180 Digital Barometric Pressure Sensor Board Module For Electronic Projects
Measuring the absolute pressure of the environment using a digital barometer such as this has some interesting applications. By converting the pressure measured into altitude, you have a reliable se..