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Gold for these 4K3 resistors
7 ohm Color Code Red
5 TOUCH - Active Low output when there is a touch on the sensor by a finger
Model 68KTYZ Operating Voltage 220V AC Frequency 50-60Hz Power 28W Speed 2
Inversion Welder
35mm Piezo Electric Sensor 72mm Green Paper Adhesive Tape Gold for these 4K3 resistorsA piezoelectric sensor or element is a device that uses the piezoelectric effect to convert voltage to vibration and vibration to voltage. This is a piezoelectric disc that picks up sound from musical instruments and other devices. Because it produces analogue output, you can connect it to a comparator circuit to produce digital output, or you can connect it directly to the microcontroller you're using. It is small and reliable enough to handle rough