Hello,
I’d like to add a RPM sensor and display
to a 110 vac, house current, single phase, miter saw.
The sensor is finished and working fine,
but it is powered by a battery.
Is there a way to tap into the 110vac in a small way
to get my 5vdc power?
I know I could use a wall-wart sized, transformer
power supply. But is there anything smaller?
Thanks.
A transformer is a safe source. Look for a small one (plentiful and cheap at recycling or thrift stores).
If you’re going to say “is there anything smaller” you need to say smaller than what. Give dimensions; wall warts come in all sizes.
I decided to try this power supply. I also ordered the 5v version too.
This is pretty small and I should be able to tuck it in somewhere.
IRM-02-3.3
Manufacturer: Mean Well
Input Voltage: 85 VAC to 305 VAC, 120 VDC to 430 VDC
Output Voltage: 3.3 V
Output Current: 600 mA
Length: 33.7 mm
Width: 22.2 mm
Height: 15 mm
I’m not sure if this is enough power.
But everything is an experiment for me anyway.
Thanks.