ESP8266 Community Forum

- Tue Oct 02, 2018 6:14 pm #78470

but rather 40V/1A

Chances are, though, that in the end a brand new NodeMCU including shipping is a cheaper and easier option.

How is that cheaper? Perhaps in your country they sell for a dollar or two but where I live, shipping on both items is the same, and that diode is about 1/100th cheaper, but I need to get the right one.

I'm not in favour of trying to answer/reply on someone else's behalf, but my answer would be similar to QuickFix and justify it being 'cheaper' on the grounds that you have saved time/effort/labour cost by not sodding about trying to replace a diode of unknown properties. Of course, that is a matter of opinion and if you have nothing better to do with your time, then it is a valid exercise. Given the cheapness in my country I always buy 2 or 3 of something such as a NodeMcu, component, etc because it saves time in the long run, as these things are made to a cost and can sometimes break or not work in the first place.

- Wed Oct 03, 2018 2:30 am #78472

How is that cheaper? Perhaps in your country they sell for a dollar or two

We pay in Euro's, not dollars (I'm from The Netherlands, you know: the country that comes second).

Like McChubby007 says: it's "Cheaper" (not specifically monetary wise) to just buy a new one; they're only around €2 (±US$2.50) each in China: that's about one tenth (so 6 minutes) of an hourly wage for us westerners.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.

- Wed Oct 03, 2018 3:03 am #78473

How is that cheaper? Perhaps in your country they sell for a dollar or two

We pay in Euro's, not dollars (I'm from The Netherlands, you know: the country that comes second).

Like McChubby007 says: it's "Cheaper" (not specifically monetary wise) to just buy a new one; they're only around €2 (±US$2.50) each in China: that's about one tenth (so 6 minutes) of an hourly wage for us westerners.

In South Africa, the NodeMCU cost about €8.40 and courier another €6.20.
The 1N5819 would cost €1.30, and I would still pay the €6.20 courier fee.

So it's not quite cheaper.
And although I got another NodeMCU, I would still like to fix this one as well.

I see on the new one, it has an "S4 diode", which led me to this: https://www.diodes.com/assets/Datasheets/ds30101.pdf

So this should then work fine?
https://za.rs-online.com/web/p/rectifie ... s/7082273/

- Wed Oct 03, 2018 3:28 am #78474

So this should then work fine?
https://za.rs-online.com/web/p/rectifie ... s/7082273/

That one only has a current rating of 350mA (the ESP alone can draw that much at peak consumption), which is too low. Just use the parametric search and filter for package SOD-323, 1A current rating and 20V or higher reverse voltage.

Since the diode is only used to protect your USB port from reverse current, you could just short the pads and the board would work fine. However, if you do that, you need to be extra careful not to apply any voltage to the VIN pin, as long as the USB cable is connected.