PaulStoffregen
Well-known member
My multimeter seem not to want to measure current... it's a cheap AstroAI AM33D, when I set it on "200m" it's going over the limit, if I set it to "10" it's reading 0.00... so between 200mA and 10A...
Most multimeters have 1 or 2 fuses. If you ever mistakenly attempt a voltage measurement across a power supply while the meter is accidentally set to current mode, the fuse blows. That's nicer than massive sustained current damaging your gear, and maybe even starting a fire if the power source is huge. But then it leaves your multimeter forever unable to measure current until you replace the fuse, which you may not even know is inside the meter and you probably wouldn't even know it's blown if it happened by accident when attempting a voltage measurement.
Alternately, you could replace that 33uH inductor before the regulator with a resistor in the 1 to 10 ohm range. Then just measure the DC voltage across the resistor and use Ohm's law to compute the current.
You really should measure the current.
Besides this i would suspect something wrong on the teensy side, most probably some bad soldering at the pins?
Indeed, there could be another problem causing the too-high current. You're really flying blind without a way to measure the actual current.