SST03 LED voltage

[dvb-projekt]

Hi P-A,

the LED in my power-switch needs 12V. I measure only 0,46V at the LED connector X4.
Is the measured voltage normal with the resistor value from the BOM?

Any recommendations?

Best regards,
Oliver

[peranders]

You may adjust R2. If your LED can take approx. 40 mA, then you can omit the R2 but if it's too much you can let current go through R2. 560 ohms may be sufficient.

[dvb-projekt]

i have insert a pot to adjust the voltage to the needed 12V.
Run's perfect! :wink:

Best regards,
Oliver

[peranders]

Notice that this pot is on a deadly potential. I'll recommend that you change to a fixed value when you have adjusted the right current.