Video sharing how to make a test kit and a versatile DC source:
☞ the test led (1 or more bulbs 1 at auto volt)
☞ measure diode
☞ measure Zener
☞ continuity measurement
☞ short-circuit protection
☞ versatile DC power supply from battery and boost voltage
☞ cheap cost: $5
#thachxuyenchannel
7 сен 2024