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Small great bread board circuit board bread board experiment board universal version product n..
$0.18
1 module uses S8550 triode drive 2 working voltage 3.3V-5V 3 is provided with fixing bolt holes to f..
$0.13
-1. size: length 32mm X width 17mm X height 15mm 2. main chip: LM393, electret microphone 3. working..
$0.26