joulethief

@joulethief@compuverse.uk

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joulethief,

2

No output with MCP1700-3302E

I’m trying to build a esp8266 weather station and got some MCP1700-3302E to power the esp8266 from a lipo. But when I connect the lipo to the MCP1700 (looking at it flat spot at the front, ground left, Vin in the middle and Vout on the right) I get no output at Vout. I googled and could not find anything. I tested 5 different...

joulethief,

Huh, that’s weird. Double checking the part markings would’ve been my next suggestion, but the picture shows they’re correct. Maybe try a 1kOhm load resistor across Vout and GND, though in theory you should be able to see the output voltage without it.

joulethief,

Unlikely. Have you measured the voltage present at Vin?

joulethief,

Just to be sure: positive probe on Vin, negative probe on GND, measurement shows no minus sign?

joulethief,

Do you have more information on this? I’m working on a PCB that suffered from a broken ferrite due to flex.

joulethief,

I haven’t got enough time on my hands right now to review the whole desingn, but one thing that jumps to mind is that you’ll want to use an antiparallel diode on each relay coil to suppress the negative voltage spikes when switching it off.

Be sure to keep adequate distance between high and low voltage traces. The ground plane seems awfully close to the N trace.

Other than that, I’d happily welcome more PCB and/or personal project discussions!

joulethief,

You’re welcome!

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