ESP8266 Community Forum

- Thu May 14, 2015 11:43 am #17386

i'm a beginner.. pls bear with me..
why u use 100uF tantalum capacitors in-out to LDO
in other circuits i have seen someone using in-100uF and out-1000uF,
another using two capacitors(ceramic) to in and out of LDO as shown in below image...


another in-4.7uF and out-10uF,

is there any difference between types(tantalum ceramic electrolytic etc) of caps we use...?
and what values of caps are best to use for esp-12..?
thanks..

The caps i used are what i had laying around. And these work fine with my board. Though you can always choose to put bigger caps on there, might you need it.

Tantalum capacitors are more precize and efficient than normal caps. But here goes the same, you may change them for normal caps.

Usually, the bigger the cap value, the bigger power fluctuations it can filter.

Some wifi a day, keeps the doctor away!
ESP-07 + DIY breadboard adapter

- Thu May 14, 2015 3:50 pm #17404

With all do respect,
Why is that nodemcu board better?
Waiting for it to arrive from china takes more than 30 days to most countries.
My board costs less than 10 dollars incl. the esp module.
For most makers, making your own singlesided pcb is a matter of 20 minutes. And no struggle at all. It all depens on your skills...

No offence, and you are absolutely right. It is all up to an individual to what level they would want to go. I have seen people making their own vacuum tubes. People wind their own transformers. It is all up to an individual's time, capacity, skills, motivation, patience, etc.

Many of us (DIY kind of people) have already dropped the idea of making PCBs at home as China is much cheaper and quality of boards is up to the mark. My UV exposure unit is collecting dust at the moment, yet I may still have FeCl3 and NaOH lying around somewhere.

I totally agree that you can get a PCB etched in 20 minutes. Skill factor comes in play after 20 minutes. Soldering, debugging, looking for dry joints, looking for shorts, etc.

If skill factor is low, patience factor diminishes after 40 minutes. Eventually it affects the motivation factor

My NodeMCU board arrived in less than two weeks.

Finally, as I said earlier, your board is a great effort. Nice single sided board is a great offering to the community, Your board Rocks!

--µrt

- Sat May 16, 2015 1:58 pm #17581 Thanks for this great board. Te files in the first post doesn't contains the right brd file. It appears to be an older version?
I would like to etch this board and need the pdf not to be mirrored.
The included pfd however, is the right version.

- Sat May 16, 2015 2:06 pm #17582 The pdf does need to be mirrored. Since it is the top layer instead of the bottom layer.
In the .brd file, is there a diode on the very right, connected to ground? If not, than it is the correct V3 file. I'm not behind my computer now so i cannot check it.
if it is indeed the wrong file, i will update it asap.

Some wifi a day, keeps the doctor away!
ESP-07 + DIY breadboard adapter