First, in a bit of meta-commentary, I’d like to briefly bring the new Substack chat feature to your attention. Chat was already available to users of the mobile app, but now it’s also available to web users, which I suspect would be more useful to many of my readers. One of my big goals is to build up a community, so please don’t be shy about jumping in. I’ve enabled every subscriber to be able to use chat on this Substack.
I'm guessing that the use of square vias versus circular vias is a following a convention for indicating positive and negative... I just have no idea what the convention _is_. Given that this will be assembled by amateur builders, you have a little board real estate between the silk screening of 5VDC and 12VDC - suggest you add silk screening to indicate that [] is + and O is - (or vice versa...). That way, there's no ambiguity.
This would probably be better than the three 3A DC-DC LM2596 Buck converters (for 12v, 5v, and 3.3v) I'm using for one of my Digital radio/sdr go box projects. Too much clutter at the moment. Would the components be able to handle 5A max across all rails?
Hi Jason, I'm not sure you are going to do 3V3 @ 500mA. With 12V in and 3V3 out that's 8.7V dropped across the regulator. The power in the reg will be 8.7V x 0.5A = 4.35W. The datasheet for the AP2213 talks about ThetaJC being 45 degC/W so we are talking close to 200degC. Alan ZL3UYJ
I'm guessing that the use of square vias versus circular vias is a following a convention for indicating positive and negative... I just have no idea what the convention _is_. Given that this will be assembled by amateur builders, you have a little board real estate between the silk screening of 5VDC and 12VDC - suggest you add silk screening to indicate that [] is + and O is - (or vice versa...). That way, there's no ambiguity.
1. Why is the order of the leds different from the order of the power rails ? That is confusing.
2. I have much SDR equipment and GPS and 10 MHz references needing 9V. Could that be something to add.
I also have a lot of 5 V like Raspberry Pi, Red Pitaya, GPS modules.
The 5V + 9V pieces are a lot more in need than 12V at my shack desk. So I would prefer (oh dear) less 12V pins and more 5 and 9V pins.
But I also realize these might together need more than the 2A your interesting design is going to provide.
This would probably be better than the three 3A DC-DC LM2596 Buck converters (for 12v, 5v, and 3.3v) I'm using for one of my Digital radio/sdr go box projects. Too much clutter at the moment. Would the components be able to handle 5A max across all rails?
Hi Jason, I'm not sure you are going to do 3V3 @ 500mA. With 12V in and 3V3 out that's 8.7V dropped across the regulator. The power in the reg will be 8.7V x 0.5A = 4.35W. The datasheet for the AP2213 talks about ThetaJC being 45 degC/W so we are talking close to 200degC. Alan ZL3UYJ