DIY-Wireless calling bell | ওয়্যারলেস কলিং বেল
Wireless calling bell made with RF transmiter and receiver module pair, HT12E and HT12D encoder-decoder Remote controlled calling bells are made this way.
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DIY-Power Bank | হাতে তৈরী পাওয়ার ব্যাংক
Learn how to make a power bank with a 18065 battery.
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