주요 콘텐츠로 건너뛰기

기기를 수리하세요

수리할 권리

상점

기기 수리 작업 관련 기술에 대하여 알아보십시오.

60 질문 전체 보기

LED and USB connection advice.

i am a serial restorer and upcycler have done many lamps previously but they’ve all been 240v (UK).

i now want to venture into LED lamps powered by USB. USB is 12V which means i need a transformer….or do i?

my question is the following: if i buy 12V G4 LED lightbulbs with their corresponding socket am i able to simply wire them up using a USB cable and that’s it? I am not an expert but i was thinking if the bulbs are already 12V i wouldn’t need a transformer from 240V to 12V? any advice is greatly received. I’d be looking to run these lights from normal power banks and/or laptop USB ports. (the reason i want to avoid a transformer as it’s a bulky item and the lamp i have in mind is small, the transformer will just ruin it)

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

점수 1
의견 추가하세요

답변 1개

선택된 해법

Caveat Emptor: You are trying to do or modify something that is connected to mains voltage. Please tread very carefully and do additional research.

A few notes on your question and assumptions.

  • USB is a 5V device, not a 12V device
  • A lamp that was designed to handle G4 bulbs will already have a 12V transformer built in.
  • If you just want to power the G4 LED bulb (in it’s accompanying socket), then you need a 12VDC, constant current power source. The current required will vary depending on the bulb so it would be best if you have the specs. If not, you can tinker a circuit in series with a multimeter and play around with different current levels. Higher current will give a brighter output but also shorten life.
  • If you want to stick with USB (5V), then you can find individual, high brightness LED’s and create a drive circuit with a series resistor to modulate the required curent.

해당 답변은 도움이 되었습니까?

점수 3
의견 추가하세요

귀하의 답변을 추가하십시오

Emil 가/이 대단히 고마워 할 것입니다.
조회 통계:

24 시간 전: 0

7일 전: 0

30일 전: 1

전체 시간: 19