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I am a very beginner on electronics, and founding a power supply that delivers enough voltage and current to my experiments is just practically impossible (and something that makes things even harder is that on my country this things is a lot more expensive). So, I googled a bit and found nothing than things that uses a lot of inexpensive components on USA or Germany (mostly), but here are just a lot of money, and are too complex and dangerous to me, and requires a lot of transformers, that I already have.

So basically I am asking for a simple diy design that can regulate freely a DC source (like input 9V DC and output from 3V to 15V, something like that, with from 0.1mA to 1A will be enough). And, if you find a design that would be good for me, please explain how it works, so I can learn a bit more of this complex world (at least for me).

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    \$\begingroup\$ How do you feel about soldering? Your requirement of 9V input and 3V-15V output is not the easiest in the world, as it means the output can be both lower and higher than the input, so the system needs to be more complex. It would be easier to start with if the input was 9V and the output was between 1V-8V, or input 16V and output 3V-15V \$\endgroup\$ – BeB00 Feb 18 '18 at 0:43
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    \$\begingroup\$ You won't want to try getting 1A from a 9v battery. Those little guys just can't deliver that amount of current. \$\endgroup\$ – JRE Feb 18 '18 at 0:45
  • \$\begingroup\$ The only solder I do is like when I go to somewhere and someone says like "hey, do you want to solder this capacitor?", but I will order a soldering station soon so my soldering capabilities will increase a bit. \$\endgroup\$ – Taarak Feb 18 '18 at 0:45
  • \$\begingroup\$ If you want to get from 3 to 15V out of 9v, then you will have to use a buck/boost switching regulator. That will be complicated, and probably involve a lot of those expensive parts. \$\endgroup\$ – JRE Feb 18 '18 at 0:46
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    \$\begingroup\$ If you have a spare laptop powersupply, then you could probably modify it instead of building the kit. \$\endgroup\$ – JRE Feb 18 '18 at 8:29
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For voltage control, you can use an LM317 voltage regulator. This is able to lower the input voltage, and is variable, so you can adjust the output voltage.

However, The maximum output voltage will always be less that the input voltage. To get 15V from a 9V input, you will need to use something like a boost switching regulator, which may require some “expensive parts.”

As stated in one of the comments, don’t try getting 1A from a 9V battery. They are not meant to supply that much current. Also, you may need to add a heat sink to the LM317 depending on the voltages and current. To find the heat created by the regulator, you can use the following formula:

Heat = (Vin - Vout) * I

This will provide the heat in Watts when the values are plugged in.

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