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32 Bit Pro Audio Level Indicator With Microphone Signal Acquisition Automatic Gain VU Meter Red Green Colors Mixed DC5V 250MA

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Mini Dual 12 Level Indicator VU Meter Stereo Amplifier Board Adjustable Light Speed Board With AGC Mode DIY Kit

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DIY Electronic Kit 6 Bit Digital Circuit Clock Production Kit Skill Contest Training Materials

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PWM Square Wave Rectangular Wave Signal Generator Driving Module Pulse Frequency Duty Cycle Adjustable 1Hz-100KHz 5.5-24V DC

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YYC-7 Time Delay Relay Module Signal Cycle Timing Switch Timer Relay 3V 3.7V 4.5V 5V 6V 7.4V

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AE11A04 DTMF Audio Signal Generator Module Voice Dual Encoder Transmitter Board for MCU Keyboard 5 - 24VDC