“Automatic LED Light Control Using LDR with BD139 / BD140 Transistor | Simple 3.7V Day Night Switch
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YouTubeTech Sparks
“Automatic LED Light Control Using LDR with BD139 / BD140 Transistor | Simple 3.7V Day Night Switch
Automatic LED Light Control Using LDR with BD139 / BD140 Transistor | Simple 3.7V Day Night Switch Learn how to make a simple Automatic Day–Night LED Light Control Circuit using an LDR (Light Sensor) and BD139 / BD140 transistor. This DIY project works perfectly on 3.7V battery, controls LED brightness automatically, and is ideal for ...
22.2K views1 month ago
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