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This is a unidirectional electret microphone with high sensitivity
2M ohm (2204) Brand Resistor Chip size 1206 Tolerance 1% Power 1/4W Temperature Range -55°C to +125°C Mounting Type Surface mount No
The resistance between the outer two pins is always 1K
It is suitable for surface mountings
12V 8 Channel Relay Module with Optocoupler 4K7 This is a unidirectional electretThis is an 8 channel relay board that runs on 12 volts. Any microcontroller or other control system circuits can be used to control loads rated up to 250V 10A AC directly. Each relay has three connections: Common (C), Normally Open (NO), and Normally Closed (NC), all of which are connected to three pin screw terminals, making it simple to connect and disconnect. To make debugging easier, the board incorporates a power indicator and a relay status LED.
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