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| Calambres:
I've got mostly two PS: The first is one I made when I was merely a kid. 24V and 8A. Short circuit proof and 2 x 2N3055 output stage. The initial case was much uglier than this and about 20 years ago I put it into this case and added a 220V fan. It has served me well for more than 40 years and only recently I had to change the *B-I-G* filter capacitor due to aging. Very low ripple. The second one is my (now) most used PS. A chinese cheapie that turned out to be quite good. 0-32V and 5A. Also very low ripple. I hacked it a bit :) Now I'm making another one just for fun. This one is a dual PSserial/parallel based on two of these ubiquitous cheap chinese kits. |
| emax:
--- Quote from: capt bullshot on January 07, 2018, 02:47:57 pm ---Is it all the same with us EE's? --- End quote --- I'm not really an EE. More a wannabe. Sadly, it's now too late for the university ... --- Quote from: capt bullshot on January 07, 2018, 02:47:57 pm ---So I made this one from scratch: --- End quote --- This is WAY better than mine. :-+ --- Quote from: capt bullshot on January 07, 2018, 02:47:57 pm ---a local electronics shop at Darmstadt --- End quote --- Muhaha! Zimmermann? EBG ? Man, I'm from 64401 ! ;D Where are you from? Send me a PM if you want! 8) (funny to find local neighbours in an australian forum) |
| MDM3D:
This is the bench powersupply I just made over the holiday and is now my favorite. It uses 3 DPS5020s. The DPS5020s are feed 50V through 4 DPS 500 CB A dell server supplies in series that can provide 45A for a total output of just over 2kw. The only bummer I have is that I only have the ability to supply 45V max out of the 5020's because they need to have at least 55V on the input. I built this mainly for electroplating and hard coat anodizing applications where lots of power is required and ripple requirements are low. As other have stated this uses low side current measurement and all of the precautions that apply with that. I may in the future wind a transformer for 3KW with 3 1 KW outputs so that I could isolate and series the outputs. I have no ideas as to how I could go about paralleling due to the low side current measurement but would definitely appreciate 60A as hard coat anodizing requires 40 amps per surface foot. It is really easy to get to a surface foot on relatively small parts like heat sinks. I have the 1st "rail" in "filtered" with a 20000uF cap had laying around and quickly removed the small multi layered ceramic capacitors that blew up on Dave's testing video. I ordered the communications versions and have plans to put an esp in to allow remote monitoring and simultaneous settings changes. I also need to really run a 220V outlet to the bench because if I ever manage to completely load the psu then it will probably blow the 20A breaker it is attached to. The attached pictures were taken during the first time I turned it on before I moved it to the bench as it has a substantial amount of gravity to it. Some quick testing with a dmm showed a Voltage ripple under 2mV for the first rail and under 9mV for the others when lightly loaded. |
| JustSquareEnough:
--- Quote from: Calambres on January 07, 2018, 06:20:54 pm ---I've got mostly two PS: The first is one I made when I was merely a kid. 24V and 8A. Short circuit proof and 2 x 2N3055 output stage. T --- End quote --- any details and pictures of the inside? |
| Calambres:
The schematic is long lost (from an electronics magazine) and the PCB is the first I ever did so it's not pretty :) One of these days I'm gonna open it up and try to trace the schem. I'll take some photos and post them here. |
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