Voltage converter

Amps from each???

The 9 may be uncommon so you might consider using a 7809 to make that one from the +12.

Tim

-- Seven Transistor Labs Electrical Engineering Consultation Website:

Isolation?

Current?

Regulation?

Depends a lot on the current ratings required. It should be possible to get +12 and +5 out in a single DC-DC converter, and, if you only needed 100mA or 200mA at 9V, just stick an LM7809 onto the 12V output.

-------------- Upps , my mistake.

--------------------- Im end effect this should be based on this concept with some additional stuff, like siren, relay outputs etc..

On a sunny day (Mon, 02 Feb 2015 19:22:02 +0100) it happened gm wrote in :

I can confirm these modules work.

On a sunny day (Mon, 02 Feb 2015 19:22:02 +0100) it happened gm wrote in :

I can confirm these modules work.

PS: The current sense shunt is in the -, so the - input is not directly connected to the - output. That can be a problem if you need the current limit. There is what seems a 10 mOhm (milli Ohm) resistor as current sense.

You could get three adjustable step-down switchmode modules to do this:

as long as you don't mind all of 'em having a common GND which is the negative terminal of your 24V source.

Yep, I use some of them. $0.99 on ebay with free shipping

-Lasse

The maximum current values that you have quoted are no problem at all. Each of the 780x series devices have a maximum continuous current rating of 1 Amp( please check the data sheet to verify) So, to tackle the higher current ratings, put 2 few of the regulators in parallel, so that each regulator handles a small fraction of the current. I have done this in the past, and it works fine.

input voltage is 24V so, 15V*0.5A+19V*1.5A+12V*1A = 48W That'll need a big heatsink

-Lasse

--------------- Thank you guys for your suggestions. My main goal is to have one board with three outputs, but i guess i can pull one additional output from some ready made buck converter...

---------------------- Guys, what do you think about this one ?

On a sunny day (Tue, 03 Feb 2015 12:45:25 +0100) it happened gm wrote in :

That should work. I don't see why you need 9V, the Arduino runs on 5V just connect it directly to 5v and don't use the regulator

-Lasse