To indicate when the 12V line (designator VCC12V) is present, you can use an LED with a current-limiting resistor. Here's how you can do it:
Connection Steps:
Choose an LED: If you don't have an LED in your project already, you might consider adding one. Since you have a place for a power indication with the designator PWR, you can use it for this purpose.
Current-Limiting Resistor Calculation:
Assume a typical LED forward voltage of 2V and forward current of 20mA.
The resistor value can be calculated using Ohm's Law:
R=ILEDVsource−VLED
For a 12V source: R=0.020A12V−2V=500Ω
You can use a standard resistor value of 470Ω or 560Ω.
This setup will light the LED whenever the 12V is present, providing a visual indication. Let me know if you have any specific LEDs or resistor values in mind!
ekalan
copilot
-
Choose an LED: If you don't have an LED in your project already, you might consider adding one. Since you have a place for a power indication with the designator PWR, you can use it for this purpose.
-
Current-Limiting Resistor Calculation:
-
Assume a typical LED forward voltage of 2V and forward current of 20mA.
-
The resistor value can be calculated using Ohm's Law:
R=ILEDVsource−VLED
-
For a 12V source:
-
You can use a standard resistor value of 470Ω or 560Ω.
-
Connections:
- Connect VCC12V to the anode (A) of the PWR LED.
- Connect the cathode (K) of the PWR LED to one end of a resistor. For this example, let's use a 560Ω resistor, assuming designator R10.
- Connect the other end of R10 to GND.
Summary:R=0.020A12V−2V=500Ω