EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: wd5gnr on October 15, 2015, 06:21:07 pm
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http://hackaday.com/2015/10/15/looking-inside-the-arksen-dual-power-supply (http://hackaday.com/2015/10/15/looking-inside-the-arksen-dual-power-supply)
Doesn't seem too bad if you trash the leads and also never ever ever turn it on and off with something connected to it. On the other hand, that's kind of a gamble. Even with a small load on it, it threw pretty big spikes.
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This sums up why one fo the first projects a tech or hobbyist should take on is a homebrew power supply, unless you buy something used and re-cap it.
If I were those two transformers on that chassis, I would ask to be liberated from that pile of crap. :popcorn:
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If you were both of them you'd suffer from split core personality disorder ;-)
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If you were both of them you'd suffer from split core personality disorder ;-)
Or it would be my twin and I....
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Which of you did mother like best? ;-)
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Eek, personal preference but I hate Times New Roman on test equipment. It feels like it doesn't belong ???
Must be hot and sticky in there. :phew:
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Which of you did mother like best? ;-)
It wasn't me, long story. :)
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I thought these things were all clones. Seems expensive to me.
Not sure why all the components are at different angles, and cables everywhere.
Is there no standard for manufacturers to address these switch on/off issues etc?
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Many of the cheap supplies are just clones / rebranded versions of a few designs. However this one looks a little different:
quite a lot of cables hangig around and a could not see a fan near the heat sink, which is way to small to work without it.
So I would consider this one a rather poor version - expensive to build and possibly even dangerrous if mains and and output side cables are mixed together.
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I was surprised he seemed okay with the whacko voltage output at start up.
Lesson: don’t hook up the load until after the unit turns on.
That is not acceptable.
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There are two fans on the rear. Somehow they never got into a picture.
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http://hackaday.com/2015/10/15/looking-inside-the-arksen-dual-power-supply (http://hackaday.com/2015/10/15/looking-inside-the-arksen-dual-power-supply)
Doesn't seem too bad if you trash the leads and also never ever ever turn it on and off with something connected to it. On the other hand, that's kind of a gamble. Even with a small load on it, it threw pretty big spikes.
One circuit breaker pop (also caused by this supply) or power failure and you can kiss you circuit under test goodbye with these puppies.
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There are two fans on the rear. Somehow they never got into a picture.
Two fans, because the fan failure percentage is 50%. When you buy the supply, chances aren't too bad that one of the fans will be operational.
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There is exactly one cheap Chinese supply that is not made (i.e., cloned) by Mr. "Some Ting Wong" and that is:
Gopher CPS-3010 (https://www.eevblog.com/forum/testgear/switching-power-supply-gopher-cps-3010-30v-10a/)
If you get anything else, you are asking for serious trouble.
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I was surprised he seemed okay with the whacko voltage output at start up.
Lesson: don’t hook up the load until after the unit turns on.
That is not acceptable.
Yeah, I say that over and over again. The designer of a lab supply that doesn't even power up cleanly clearly doesn't give a shit about the design, so what can one expect from such a supply?
About freeing transformers ...... they are probably low-grade. Poor core material, bad potting, lots of humming, maybe even isolation that wouldn't hold up in a serious test. High quality transformers can be acquired so cheaply today, I simply wouldn't bother with those. Also, for a good lab supply for analog stuff you really want a transformer with electrostatic shielding. They are a bit harder to come by, and more expensive.
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I was surprised he seemed okay with the whacko voltage output at start up.
Lesson: don’t hook up the load until after the unit turns on.
That is not acceptable.
Yeah, I say that over and over again. The designer of a lab supply that doesn't even power up cleanly clearly doesn't give a shit about the design, so what can one expect from such a supply?
About freeing transformers ...... they are probably low-grade. Poor core material, bad potting, lots of humming, maybe even isolation that wouldn't hold up in a serious test. High quality transformers can be acquired so cheaply today, I simply wouldn't bother with those. Also, for a good lab supply for analog stuff you really want a transformer with electrostatic shielding. They are a bit harder to come by, and more expensive.
Agreed.