| Electronics > Projects, Designs, and Technical Stuff |
| DIY Variable Multi-Output Power Supply Project |
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| prasimix:
I'd like to recommend you with a whole heart to use SMD from the start as much as possible. I've started my adventure with THT believing it is more DIY-friendly, but it is not! Prototyping where you need to add, remove and change components often is much easier with SMD. Also if you're going to do something with power switching you can expect a lot of trouble because THT cannot be packed and arranged as SMD parts. Ok, there is parts like bulk elcos, connectors, etc. where THT is still better choice. Also you don't need to go in another extreme and use QFN and BGA packages that requires stencil, microscope, pick&place, etc. |
| Kippre7790:
thanks for the concern, I've never tried using SMD mainly because I can't stick them in a bread board and test them as I like to test most of my circuits before putting them together. That's one of the main reasons which is keeping me from switching. What do you guys think about using the LM2596 to drive a power transistor to get a higher current output compared to the 3A of the LM2596, or better yet use the LM2596 to drive the transistor and switch a higher voltage? Doubt I'd go over 3A of current but if I can do either of those, then I could use it to supply some low voltage high power applications later on. Here is the datasheet: http://www.ti.com/lit/ds/symlink/lm2596.pdf |
| Kleinstein:
Combining the LM2596 or similar SMPS chip with integrated power stage with an extra power transistor may not work that well. Usually one would than better start with SMPS chips that is made to work with an external power transistor. So more like TL494/TL497 or uC284x / uC38../LT124x . A transformer followed by a SMPS regulator is not that bad - it is just not common. For a beginner I would start low power. If this works it is often a relatively small step to scale up to a little higher power. |
| LeoTech:
--- Quote from: Kippre7790 on February 25, 2020, 10:23:09 pm --- --- Quote from: LeoTech on February 25, 2020, 09:44:19 pm --- That's a good idea, considering the heat, but 6 Watts should be doable. Just keep in mind, that if your scope needs a 9 V input, then the pre-regulator from your main supply has to be higher than 9 Volts, because the linear regulator will cause a voltage drop. Although you probably know that, and just did a typo in the block diagram. --- End quote --- Got any input on the switching supply part of things? --- End quote --- Unfortunately no, I have mostly been playing around with building semi-discrete linear regulator power supplies. Leo |
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