Powering 16F628 From Stable 12vDC

[mat janssen]

When you take 300 mA and the voltake over the LM317 is 24 - 8 = 16 volt. The power into the LM317 is 16 x 0,3 = 4.8 watt.
So you have to cool that power down. The power in the LM7805 is less 0,3 x 3 = 0.9 watt. For this power you need also cooling.
LM2578 is may be usable

[ngeronikolos]

Hi Acetronics,

Could you please suggest me a common switching supply.
Do you mean dc-dc step down converter?

[Acetronics2]

Hi Acetronics,

Could you please suggest me a common switching supply.

That's the kind of question I CAN'T answer : you live in a different country with a widely different market !!!

> Do you mean dc-dc step down converter ?

Yes, National has lots of down converters, in the LM 25xx series you mentionned.
And the Datasheet is really crystal clear for components around ...
do not forget a small ( LoL ) heatsink will also be necessary ...

Alain

[Gevo]

I use for a lot of applications the LT1933. (Linear Technology)

A very small device, external a few resistor, diode and 1 coil of 22uH.

See the internet for specs.

[CocaColaKid]

We currently use th LM2574-5.0 just for this reason. Our 5V line require around 200mA-300mA which when run through a linear regulator I could probably heat my house since our source voltage is 24VAC which comes up to around 30-35VDC. The regulator works quite nice and is pretty cheap. I've run it up to about 350mA-400mA and it does get warm to the touch but not hot by any means.