Re: 120 volt LED design


<Blake180@xxxxxxxxxxx> schreef in bericht
news:9093da5b-4029-4f18-afeb-011c0f8622cd@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Is it possible that I can add an LED in series with a 120 Volt AC
circuit, this will light up to indicate that I have power when a load
is connected. This LED will have to handle 15 amp load


120V~
| |
| |
| |
| | +-----+
| o | |
| | | |
| +-----+ | .-.
| | |5V~ 120V~ | | |2k2
| .-. +---. ,------+ .-----. | | |
| | | )|( +-| ~/ |-+ '-'
| | |.02R/5W )|( +---| / = |---+ |
| '-' +---' '----+ '-----' | |
| | | 100mA | V LED
| +-----+ | -
| | | |
| o +---+
| |
| |
| |
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

For measuring or signaling current the best thing you can use is a current
transformer. But this tend to be expensive things that are not always
available.

If you only want to signal the current in 10-15A range, the circuit above
will do.
Be sure to make proper connections between the 0.02R/5W resistor and the
main line. A bad connection will become hot and fry itself. The resistor
will become hot as well so provide enough ventilation.
Connect the transformer directly to the resistor (so not to the line).
The transformer can be a ordinary 100mA type. Even a 50mA type may do though
it can become a little bit too warm. Mention its orientation.
Use a low current type for the LED. A 2mA type will do.

As the circuit is directly connected to the mains, use proper insulation.
120V~ does not always kill but you don't want to be the exception... I guess
:)

petrus bitbyter









.

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