Amazing Project using an old phone charger !

I modified an old phone charger and made it output 30 volts then, I added a voltmeter screen to use it as a tester for measuring any LED or zener diode less than 30 volts.

• #science_technology
• #inventor_aw
• #thats_why_you_shouldnt_throw_away_your_old_phone_charger
• #phone_charger
• #good_idea
• #tools
• #inventions
• #beautiful_ideas
• #convert_old_phone_charger_to_amazing_device