Hello, I'm currently planning to build a small benchtop device. I'm working through some of the basics - physical layout, external connections, and status lighting.
My current question is around how best to power the indicator lamps. This device will be directly connected to mains power and I'm planning on using separate switches for the primary and secondary sides of the power transformer. I've put together a drawing showing two simplified versions of the power supply circuit:
- Figure 1 shows what I think is a typical Power/Standby switch layout using a single pole single throw switch (1P1T) and an indicator lamp on both sides of the transformer.
- Figure 2 shows an alternate layout where the both the primary and secondary indicator lamps are powered from the primary side.
- Figure 3 shows another layout powering both lamps from the primary side, using a relay in this case.
Are there any rules, best practices, or other guidelines I can consider here?
Drawing updated to include Figure 3, using a relay.
Thanks, any input provided is appreciated.
-Rob