Hi,
I would like to build a Linear P.S. able to deliver approximately 10A.
The output voltage should be 12V (fixed, there is no need to have a variable output voltage): this is to replace the switching P.S. of a NAS.
I am looking for a shematics of a reliable and simple P.S.: maybe a few of you have already built a similar P.S. ?
Thank you for your help,
Michel
I would like to build a Linear P.S. able to deliver approximately 10A.
The output voltage should be 12V (fixed, there is no need to have a variable output voltage): this is to replace the switching P.S. of a NAS.
I am looking for a shematics of a reliable and simple P.S.: maybe a few of you have already built a similar P.S. ?
Thank you for your help,
Michel
Oh, linear PSU for computing, some stuff can be found in museums, or really old equipment sale.
I owned a Canon BX-1 (1977) which used a linear PSU. The PSU was as heavy as the rest of the computer, and generated more heat than the computer itself, due to requirement of keeping up with low line voltages.
MO5.COM : Musée des Machines : Ordinateur : Le Canon BX-1
Oh, btw, there is another level, which is making a SMPS which does not significantly disturb shortwave and mediumwave radio, with the help of a radio receiver. In this field I can say that some hard drive 12V 1A adapters disturb radio reception more than my 2000W class D amplifier.
I owned a Canon BX-1 (1977) which used a linear PSU. The PSU was as heavy as the rest of the computer, and generated more heat than the computer itself, due to requirement of keeping up with low line voltages.
MO5.COM : Musée des Machines : Ordinateur : Le Canon BX-1
Oh, btw, there is another level, which is making a SMPS which does not significantly disturb shortwave and mediumwave radio, with the help of a radio receiver. In this field I can say that some hard drive 12V 1A adapters disturb radio reception more than my 2000W class D amplifier.
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Of course there is the dirt DIY approach:
12V 10A Power Supply | Circuit Diagram
btw: To get into the whole subject I recommend getting an old tube radio with some repairable fault, and repairing it. Then facing the challenge of picking stations 1000Km away with SMPS in the equation.
12V 10A Power Supply | Circuit Diagram
btw: To get into the whole subject I recommend getting an old tube radio with some repairable fault, and repairing it. Then facing the challenge of picking stations 1000Km away with SMPS in the equation.
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There are thousands of examples on the net, but some aren't really optimal, you need to chose carefully.
I have built a number of my own, I am not sure I can locate all of them but here are an example or two.
This one is based on a TL431 as a reference, and has a current limitation (you can remove it if you wish). A single 2N3055 is shown, but for 10A 2 or 3 is a minimum (with 0.1 ohm balancing resistors):
This is a LDO, negative regulator (it does not matter if the source is floating).
It has a 8.3V output, because I adapted it for a forum member (it was built successfully), but the output voltage can be changed to 12V by altering the ratio of R3 to R4.
I have also built more conventional types, based on a traditional zener, but I don't see them in my files. I need to look more carefully
I have built a number of my own, I am not sure I can locate all of them but here are an example or two.
This one is based on a TL431 as a reference, and has a current limitation (you can remove it if you wish). A single 2N3055 is shown, but for 10A 2 or 3 is a minimum (with 0.1 ohm balancing resistors):
This is a LDO, negative regulator (it does not matter if the source is floating).
It has a 8.3V output, because I adapted it for a forum member (it was built successfully), but the output voltage can be changed to 12V by altering the ratio of R3 to R4.
I have also built more conventional types, based on a traditional zener, but I don't see them in my files. I need to look more carefully
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