ausserirdischegesund
Active member
It is no problem to get phone chargers or other "wall warts" that have specs like 700mA/5V, which is of course enough for Teensy. It is oversized by one order of magnitude for most projects, though, as a Teensy would probably be fine with 70mA most of the time.
Now I understand that we are not talking about huge waste of energy, but rather just a tiny bit. Nevertheless losing about 1W in the power supply while doing the actual work with 50mA seems rather wasteful. Using batteries is no solution in many scenarios either (and charging batteries has even worse efficiency, probably). Projects with tens of independent Teensies are no problem. Having tens of wall warts idling at 1W is still a bit of waste.
Is there a 5V 100mA or 200mA power supply that can be bought? What do 0.5W/230V LED bulbs use as a power supply? That was the commercial product with the smallest wattage rating I found.
Now I understand that we are not talking about huge waste of energy, but rather just a tiny bit. Nevertheless losing about 1W in the power supply while doing the actual work with 50mA seems rather wasteful. Using batteries is no solution in many scenarios either (and charging batteries has even worse efficiency, probably). Projects with tens of independent Teensies are no problem. Having tens of wall warts idling at 1W is still a bit of waste.
Is there a 5V 100mA or 200mA power supply that can be bought? What do 0.5W/230V LED bulbs use as a power supply? That was the commercial product with the smallest wattage rating I found.