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

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

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

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

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

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