What is the SMD version of 1N5400
Thank you
Something like this: https://uk.farnell.com/on-semiconductor/s3a/diode-standard-3a-50v-smd/dp/1017803
Is it OK for this circuit???
Thank you
Which museum did you get that 78S05 from.
It's 2020.
We now use switching buck converters to drop that much voltage at that current.
They are about $1 on ebay, and don't need a heatsink (the 78S05 would need one as big as a fist).
Leo..
xlameee:
Is it OK for this circuit???Thank you
Yes - do you know if its actually needed for your purposes - it prevents the regulators capacitor back-driving the power source - often this is not needed.
Your circuit has a very large input capacitor, which implies it assumes the power source is intermittent in nature, so the diode prevents the input voltage dropping too fast during gaps in the supply.
Perhaps if you explained what you are trying to do and what the power source is you will get a higher quality answer, I'm sensing an element of xyproblem here.
MarkT:
Yes - do you know if its actually needed for your purposes - it prevents the regulators capacitor back-driving the power source - often this is not needed.Your circuit has a very large input capacitor, which implies it assumes the power source is intermittent in nature, so the diode prevents the input voltage dropping too fast during gaps in the supply.
Perhaps if you explained what you are trying to do and what the power source is you will get a higher quality answer, I'm sensing an element of xyproblem here.
I need to power arduino pro mini 5v from my solar system witch is 24v I also need 3.3v for other stuff
so from this schematic that I attached I also have 1117-3.3 version to get the 3.3v
I need something simple
Wawa:
Which museum did you get that 78S05 from.
It's 2020.
We now use switching buck converters to drop that much voltage at that current.
They are about $1 on ebay, and don't need a heatsink (the 78S05 would need one as big as a fist).
Leo..
This is what I found online I want it something simple. I have seen a lot of schematics for 24v to 5v but I didn't understand them and I want it also variable input voltage because I am going to connect it to a solar battery 24v and the voltage will change
Thank you
xlameee:
I need something simple
LM2596 based DC/DC buck converters are about US$1 on ebay, shipped.
Adjust it to 5volt before you connect it to the 5volt pin of the ProMini.
You can use a 1117 to drop that 5volt to 3.3volt.
Leo..
xlameee:
I need to power arduino pro mini 5v from my solar system witch is 24v I also need 3.3v for other stuff
Then the diode may be useful.
Why the large capacitor values though? 0.33uF and 0.1uF are all you need for the L78S05 input/output according to the datasheet, although larger output caps are often needed by the load.
so from this schematic that I attached I also have 1117-3.3 version to get the 3.3v
I need something simple
Best to post the full schematic then, in case you've more issues...
A linear supply (the 78S05) could be OK if total current draw is below 50mA.
Anything more and the 78S05 will be too hot to run without a heatsink.
A DC/DC buck converter does this more efficiently, so doesn't get hot.
This one has a fixed 5volt output.
I don't see the need (yet) for a diode, unless a battery is involved with that solar panel.
Would be good to see the whole circuit diagram.
Leo..