Propeller protoboard 12v?
Hello guys!
Is it possible to feed the proto-board with 12v? It says only 6-9. But according to the data-sheets for the regulators, they can take much more. Or am i missing out on something here?
Is it possible to feed the proto-board with 12v? It says only 6-9. But according to the data-sheets for the regulators, they can take much more. Or am i missing out on something here?
Comments
Graham
With 12V in and 5V out that's 7V difference times the current when it's just running a little demo will be maybe 10 to 20ma but can climb to over 100ma. That's still okay though even though those regulators are getting a bit warm at just under 1W. Now you want to do something more with it then running a demo and you hook-up a few more things that load up the +5V supply. That's where we wave bye bye to the valiant linear regulator which gave it's all for Prop and Spin.
It's okay as Graham said but know the limits based upon those other variables that only you know. Parallax specified these voltages because they took into account how the protoboards are used and that all kinds of stuff gets hooked-up to them.
Again! Thank you very much for that explanation!
I think i will be safe then. Because, i will not pull anything more through them than the prop itself and a RTC-clock.
The need for 12volt is for my ULN circiuts, and those will not feed through the regulators anyway!
So the voltage-drop is only 12V-9V=3V and then 9V-5V = 4V. So this might be a good alternative for using two different powersupplies.
Now a days voltage-regulators use to have a thermal protection.
This means the voltage (and current) is going down if a limit-temperature is reached. The circuit will get not enough voltage and will not function as long as the temperature is at the limit but the regulator will be protected from burning through.
Does the datasheet mention anything about thermal protection?
keep the questions coming
best regards
Stefan