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A high-power LED torch using a single AA-batteryby qs
RGB LED Love Heartby simoninns
Homemade Infrared Rangefinder (Similar to Sharp GP2D120by pyrohaz
5 Minute Water Sensorby sjroth
Water Level Sensorby aessam1
Zelio PLCby Husham Samir
Underwater Video Camera / Camcorder Housing for less than $50by gomiboy
Water Level Indicator with Alarmby raikut
Hearing Aid amplifier four transistors (good quality and low cost)by Mic100
Water Level Indicator with Alarmby Er Varun Goyal
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