Here's my new power supply, £45 second hand. It's a 0-35V 0-3A (105W) linear power supply with CV/CC automatic switch-over. It's got short circuit protection too, and I've tested it.
I have some 22 ohm power resistors (25W) and I loaded it down. Ripple is incredibly low, below about 2mVp-p, even when under 3A load at 35V (only briefly as this would be 105W into 50W total maximum.) I don't really want to exceed 1A as my wire is specified to that only.
It weighs a ton. Manufactured by Takasago in Japan. Apparently it was sold cheaply because apparently the wrong name was printed on it (GM035-3) when it should be TM035-3. It seems like it was a simple typo as T and G are very close on a QWERTY keyboard.
One thing is, when I put it on top or below my scope, it made the CRT display ripple a lot (it's a digital scope with a CRT display), probably due to the large input transformer creating a large magnetic field, although it didn't adversely affect measurement as the input section of the scope is well shielded. So I put it on the other side of my bench to prevent this being a problem.
I might want to open it up and see how the caps are doing. I'm not sure how old it is. On the side I can see three massive power transistors for the regulation on a large heatsink, as well as the transformer, and some control electronics, but not much else.
Next up - probably a spectrum analyser for EMI testing.
I have some 22 ohm power resistors (25W) and I loaded it down. Ripple is incredibly low, below about 2mVp-p, even when under 3A load at 35V (only briefly as this would be 105W into 50W total maximum.) I don't really want to exceed 1A as my wire is specified to that only.
It weighs a ton. Manufactured by Takasago in Japan. Apparently it was sold cheaply because apparently the wrong name was printed on it (GM035-3) when it should be TM035-3. It seems like it was a simple typo as T and G are very close on a QWERTY keyboard.
One thing is, when I put it on top or below my scope, it made the CRT display ripple a lot (it's a digital scope with a CRT display), probably due to the large input transformer creating a large magnetic field, although it didn't adversely affect measurement as the input section of the scope is well shielded. So I put it on the other side of my bench to prevent this being a problem.
I might want to open it up and see how the caps are doing. I'm not sure how old it is. On the side I can see three massive power transistors for the regulation on a large heatsink, as well as the transformer, and some control electronics, but not much else.
Next up - probably a spectrum analyser for EMI testing.
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