http://www.learningelectronics.net/circuits/high-intensity-energy-efficient-led.html

 

Discussion of this kind of circuit is allowed on these forums - transformerless power supplies, and mains powered LEDs.

 

Discussion of this kind of circuit is allowed on these forums - transformerless power supplies, and mains powered LEDs.

Will u pls provide any link of these typ of forum which u r telling.

 

The circuit is described in the link.

"When switch S1 is towards left position and AC mains is available, the battery charges through diode D6 and the white LEDs don’t glow. The negative DC path through diode D5 makes the transistor cut-off, preventing the battery current from LEDs to the negative terminal through the transistor.

Thus the white LEDs don’t glow. On the other hand, if AC mains is not available, charging stops and the base of transistor SS8050 gets positive voltage from the battery through slide switch S1 and resistor R3. The transistor conducts and the current flows from the battery’s positive terminal to the negative terminal of the battery through the LEDs (LED2 through LED21), collector to emitter of transistor T1 and switch S1."​

 

Will u pls provide any link of these typ of forum which u r telling.

Check the 'user agreement' link at the very bottom of this page.

Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:

• Any kind of over-unity devices and systems
• Devices designed to electrocute or shock another person
• LEDs to mains
• Phone jammers
• Rail guns and high-energy projectile devices
• Transformer-less power supplies

If You come across a thread or post discussing any of the above topics please report the thread so We can close, and if necessary remove, the offending thread/posts.

 

Hello,

As @AlbertHall said, the subject can not be discussed here.
Both the transformer-less power supply as the leds to mains will apply.

Bertus