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Forum Index : Electronics : 6Kw Ozinverter build
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| noneyabussiness Guru  Joined: 31/07/2017 Location: AustraliaPosts: 513 |
Bugger... all at once to i suppose. .. bloody Murphy. .. Unsure on poly caps, but i do know that electrolytic caps can sometimes read low, until you cycle them a few times. Something to do with the fluid inside and if they been sitting for a while... Hope everything sorts out with acco I think it works !! |
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renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Ahh the caps are no big deal, only a dollar or two, bloody car is a bigger problem than that. Got another delivery of 100nf caps today, same problem testing at 34,36 etc. Why the hell are all the other parts testing fine and 4 deliveries of 104's are all crap? Are they harder to make for some reason? Cheers Caveman Mark Off grid eastern Melb |
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| Mulver Senior Member  Joined: 27/02/2017 Location: AustraliaPosts: 160 |
Not sure if this is any help?? Capacitor Healing Discussion |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Oh that cheered me up!  LOLNow I have another problem to look forward to Haven't got the big caps yet, I got these ones I'll work out how to test them when they come. Sourcing the parts and testing them to see if they are total crap is harder than building it. Cheers Caveman Mark Off grid eastern Melb |
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| Mulver Senior Member Joined: 27/02/2017 Location: AustraliaPosts: 160 |
Sorry  didn't mean to dampen your mood!!!I was more referring to this comment And Not sure if it refers also to monolithic caps as well though!! |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
That discussion was all about the big electrolytic caps. In Melbourne, you probably have a few options to buy electronic components, for me the only local option is Jaycar or order online. I have never bothered to go into that detail with checking all the components other than the MOSFETs. But maybe I should. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
LOL sorry Mulver didn't mean to offend. You're not familiar with my sarcastic dry humour. BUT still, the question remains, if you have this OZ control circuit that calls for 100nf mono caps and you fit ones that measure 34nf will it perform??? Are there all these little gremlins in peoples boards that they are not aware of because of crappy components?? Thanks Mad, after 4 bad 100nf mono cap deliveries I'll just go to alltronics next. Cheers Caveman Mark Off grid eastern Melb |
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Ralph2k6 Senior Member Joined: 24/09/2017 Location: AustraliaPosts: 129 |
Hold on a moment. Are those Aliexpress capacitors US$38.50 each! Goodness..  Ralph |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
these are $38.50 USD for 10 units. That was the next thing for me to be concerned with, I'll cross that bridge when I come to it. ATM I'm concerned with the crappy values of mono caps on the control board and how close to value they need to be. 30% of actual intended value would appear to be a disaster to an electrical greenhorn such as myself, however maybe it's no big deal, hence me asking the question. Building small aircraft tolerances are very tight, thinking of 30% value is unthinkable, even 1/100th% is unthinkable. Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
I would replace them for the sake a few dollars it could save you a lot more dollars, blood, sweat and tears. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Mulver Senior Member Joined: 27/02/2017 Location: AustraliaPosts: 160 |
No offence taken at all! I was thinking that they might return to better results once they are in use! That's all.  My experience in electronics is about 16 months reading this forum  |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
We never used to worry about it too much, you just designed it into the circuit- electros have improved markedly since I started- they used to be +- 50% of marked value, which was why they were used in filtering, but not things that required accuracy like the old 555 timer circuits, used tags or greencaps instead, even tho in theory you could use a electro, it knocked your accuracy to hell and back But even resisters ave improved, they were usually +-20%, 10% if you could afford them, 1% were incredibly expensive and only used in the most critical of circuits- these days its hard getting anything except 1 or 5% resisters |
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| Ralph2k6 Senior Member Joined: 24/09/2017 Location: AustraliaPosts: 129 |
@Boppa. He's referring to the ceramic caps, but yeah electro's have improved. I second the idea of maybe buy 1 more batch then just run with them, those little ones are pretty cheap. Or gently power them in a little resistor capacitor low voltage circuit to load them up and see if some voltage pressure brings them up a little. Even though they're a solid state capacitor. Edit; typo Ralph |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Thanks guys, yeah I'll replace them, reckon it's best to go to a local shop and test them on site. Just puzzles me why almost all parts were fine but 4 orders of the 100nf's were all bad. The only other problem was some electrolytic ones were a bit down but not by a lot. I'm not going to trust any parts now, it doesn't take long to test them. Cheers. Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
If you read through the Oztules post in the thread linked above regarding the big caps he says how they improve with use so I would not worry about those. Not suggesting this applies to the small monolithics. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Well I ended up going to Jaycar and the 100nf caps are really close to 100nf. My big caps came today and if that little tester can be trusted they were all over 10,000 uf except for one which was 8800. So that's good. My Hakko came today too, so I can have some fun with that 8010 chip now. Cheers. Cheers Caveman Mark Off grid eastern Melb |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Does anyone know where I can get an Aerosharp 3Kw toroid (complete and unmolested) in Melbourne ? Cheers, Tony. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Hi Tony, good news is I have two, bad news is I need them for my second inverter. I know someone had two listed in Keilor on gumtree but the wanted $180 each. I can't find the ad, but kept his number if you want it. Bit pricey, a cheaper one should turn up. Cheers Caveman Mark Off grid eastern Melb |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Thank you Mark, I will think about that, although that is a bit spendy. One other question, have you or anyone else tested one of these Aerosharp 3Kw toroids for no load magnetising current with the original secondary winding at 230v ? Cheers, Tony. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
I have a second inverter with the original secondary, it draws less than 25W total at idle. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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