Need a wee heater for my Feeders. saw something where 4 ...100 Ohm 1/4 watt resistors ( parallel) epoxied to underside of feeder provided 1 watt heat off of a cheap /ubiquitous USB power wart.
What resistor assembly could produce say 1.5 to 2 watts on a 5 v 1 amp or even 12 V 1 amp wall wart ? Have a few unused ones on hand
Hey.. this is what old guys fixate on.. apologies.. if not strictly Audio.
What resistor assembly could produce say 1.5 to 2 watts on a 5 v 1 amp or even 12 V 1 amp wall wart ? Have a few unused ones on hand
Hey.. this is what old guys fixate on.. apologies.. if not strictly Audio.
Ten resistors, each 300R rated at 1W, all in parallel, would burn 5W.
That may be enough heat, using your 12V 1A power supply.
But I think he's right, they migrate during the winter.
That may be enough heat, using your 12V 1A power supply.
But I think he's right, they migrate during the winter.
Use the symbol N to denote the number of identical resistors connected in parallel
Use the symbol R to denote the resistance of each identical resistor
Use the symbol V to denote the output voltage of the wall wart
Use the symbol P to denote the TOTAL POWER dissipated by the N parallel resistors
Use the symbol I to denote the current drawn from the wall wart
then you can explore your options by using one or more of the equations below
Use the symbol R to denote the resistance of each identical resistor
Use the symbol V to denote the output voltage of the wall wart
Use the symbol P to denote the TOTAL POWER dissipated by the N parallel resistors
Use the symbol I to denote the current drawn from the wall wart
then you can explore your options by using one or more of the equations below
P = (V * V * N) / R . . . . . and each of the N resistors dissipates (1/Nth) of the total power
R = (V * V * N) / P
I = P / V
We have a few hummingbirds that weather out the winter here in NW Washington (state).
My wife's solution to the extra cold weather we've had for the past couple of weeks:
Attachments
The heat lamp is a great idea.
There are lots of Anna's humming birds here. It's generally mild on the southern tip of the Island.
jeff
There are lots of Anna's humming birds here. It's generally mild on the southern tip of the Island.
jeff
Yes, during the coldest temperatures (8 or 10 deg F) we noticed a few would come by just to warm up. 🙂
The true naturalists say not to feed humming birds as it stops them from doing their natural migration. Free food but they may freeze.
1) Thank you.. for the 'how to' responses Appreciated/usefull information..
2) as for migrating; Here in Pacific Northwest... Anna' s Hummingbirds... Do Not Migrate.... they simply Die..... during extended Cold periods.
Which are currently going from Rare to Common place events...thanks to All those Coal fired Electric plants.
2) as for migrating; Here in Pacific Northwest... Anna' s Hummingbirds... Do Not Migrate.... they simply Die..... during extended Cold periods.
Which are currently going from Rare to Common place events...thanks to All those Coal fired Electric plants.
The heat lamp is a great idea.
There are lots of Anna's humming birds here. It's generally mild on the southern tip of the Island.
jeff
Nope... Hydro generators in this part of the world. Mostly USA and SE Asia that still use the things currently.
Currently +1.0C here with ~10cm of fresh wet snow. Pretty much a giant slurpee out there right now.🙁
jeff
jeff
I saw one about a week and a half ago (Olympia area), gorgeous little thing, even returned to the particular pine shrub a second day. Then the snow hit. Now it's raining non-stop. I wonder what happened to him/her? Where does a tiny creature like that go when the weather is completely abysmal?