Revised a bit, boards ordered

A project log for Soft power button with sense output

One of my designs needs a soft power button with sense output. I'm posting my design here to be reviewed and improved.

Christoph • 11/02/2017 at 20:48•3 Comments

So this is what I'll try:

There's only one modification compared to the schematic in the previous log: A cap between Q1's gate and Vbat_in. When the button is pressed, this cap will be charged and keep the mosfet open should the switch bounce.

One of the headers has the same pinout as standard TO-220 MOSFET (G-D-S) so Q1 can be replaced by an external larger transistor, even on a breadboard.

The PCB:

The switch is centered so the board won't lean over when pressing the switch while breadboarded.

A pack of these is ordered from both oshpark and aisler, I'll compare, solder and test them when they're here.

Previous log

First version (untested)

10/28/2017 at 19:52 • 4 comments

Next log

Boards and stencil from Aisler arrived, first test

11/15/2017 at 00:19 • 1 comment

Discussions

K.C. Lee wrote 06/09/2018 at 19:20

I would serious not want to use Schottky diodes for D1. Schottky diodes have more leakages than silicon diode i.e. small current can flow even when they are reverse biased at higher temperatures.

Are you sure? yes | no

davedarko wrote 11/02/2017 at 22:11

so did you order 2 versions? Are they labeled with version numbers? That's helpful when the older one gets a swift upgrade ;)

Are you sure? yes | no

Christoph wrote 11/02/2017 at 22:24

No I ordered the same board twice. The first (oshpark) was an accident because I was simply used to ordering boards from them, and then I placed the aisler order (plus stencil) for faster shipping.

Are you sure? yes | no

Revised a bit, boards ordered

First version (untested)

Boards and stencil from Aisler arrived, first test

Discussions

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