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Now I am sharing This video, Mini UPS || মাত্র ৫০০ টকায় ৬ ঘন্টা ব্যাকআপ - How To Make Mini UPS For WiFi Router & Onu At Home
They Are:
1. ups circuit
2.old laptop battery
3.male/female jack
4.swtich
5.5v circuit
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#homemade_UPS
#ups