ESP8266 Community Forum

- Fri Sep 02, 2016 2:12 pm #54332 Left to right: GND, Vout, Vin.

I know that board doesn't have caps and should but I added 10uF tantalum caps between Vin and ground and Vout and ground on two other boards and they did not change a thing. I had to add the caps after the board was manufactured because ... OK, no real excuse. But I did add them after the fact and it didn't change anything at all. Here are two more photos with the caps added, one with the 12-F and a few resistors and a diode.

- Fri Sep 02, 2016 2:20 pm #54333

The only explanation I can think of is incorrect connections to Gnd-Vout-Vin. Also note the tab is connected to Vout, the center pin.

Not having capacitors would not yield such erroneous results, at least not in simple voltage measurement tests.

The footprint I used from the Eagle library (Device REG1117, Burr-Brown library), does not have any connections to the tab. I thought it was no more than a heat sink. I will see what happens when I connect it to Vout.

- Fri Sep 02, 2016 2:24 pm #54334 You shouldn't have to, its internally connected. But its always a good practice to.

- Fri Sep 02, 2016 2:45 pm #54336 I really hate to tell you guys this but the problem is with my DVR! When I checked it against a known 3.3V value (Vcc out of a FTDI), it measured 6V! Other measurements of known voltages were similarly wrong. I never would have suspected this. Well, eventually I did suspect it, hence my check. I am so sorry for taking all your time and effort but on the other hand, I can't tell you how much I appreciate it. I wish there was some way to pay you all back. If there is ever a ESP8266 convention, drinks are on me!