- Thu Sep 01, 2016 8:01 pm
#54293
Without power applied, do an ohm meter check from the input and output of the regulator.
Could you post a picture of the board?
Could you post a picture of the board?
- Thu Sep 01, 2016 8:37 pm
#54294
170 K between input and output. Here is an image of the board with nothing on it other than the VR, which still gives me 5V out for 6V in.
- Thu Sep 01, 2016 9:00 pm
#54295
I realize that the solder joint on the center pin looks pretty bad in that photo. The pad is quite large and the solder connection was good - but just to quell your doubts, I fixed it up and re-shot it. I also uploaded the full-res version of the board this time;
- Thu Sep 01, 2016 11:17 pm
#54298
OK.
I don't see any capacitors. The was my first OMG
Some regulators can be unstable without adequate capacitance. The LM317 series isn't as bad as some but I would add it if you can.
I had thought that not having a load would have been a no-no, but according to the data sheet the fixed voltage models are not required to have a load.
Now back to capacitors. I don't see any reference designators to indicate that you have any. Most electronics needs them. As a reservoir for current surges that happen when state changes happen. The ESP8266 would have some internally but I have found it to be marginal. I don't know what the other chip on your board is but it looks to be an IC (not a module) and I would expect it needs to have some capacitance included across it's power and ground lines. Without them you end up with glitches and unstable operation. The must be placed as close to the pins that require them.
Just to cover all the bases, could you tell me what the sequence function is of the pads for the regulator. From left to right, which is ground, Vin, Vout.
I don't see any capacitors. The was my first OMG
APPLICATIONS INFORMATION
Figure 1 shows the basic hookup diagram for fixed-voltage
models. All models require an output capacitor for proper
operation, and for improving high-frequency load
regulation; a 10µF tantalum capacitor is recommended.
Aluminum electrolytic types of 50µF or greater can also be
used. A high-quality capacitor should be used to assure
that the ESR (Effective Series Resistance) is less than
0.5Ω.
Some regulators can be unstable without adequate capacitance. The LM317 series isn't as bad as some but I would add it if you can.
I had thought that not having a load would have been a no-no, but according to the data sheet the fixed voltage models are not required to have a load.
Now back to capacitors. I don't see any reference designators to indicate that you have any. Most electronics needs them. As a reservoir for current surges that happen when state changes happen. The ESP8266 would have some internally but I have found it to be marginal. I don't know what the other chip on your board is but it looks to be an IC (not a module) and I would expect it needs to have some capacitance included across it's power and ground lines. Without them you end up with glitches and unstable operation. The must be placed as close to the pins that require them.
Just to cover all the bases, could you tell me what the sequence function is of the pads for the regulator. From left to right, which is ground, Vin, Vout.
