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Before trying to roast someone maybe you can change your perspective of view. My job has nothing to do with those areas and I am working 10-12 hours a day after which I need to come home and learn things that I don't need so I can continue to run my business which again has nothing to do with...
Google was my friend for 200 pages of questions that I didn't have answer to, but some answers I can not find like this as I wrote in my post. I am not student, and my time is limited, and I am not able to read 500 pages thoroughly for "maybe" finding answers to theese specific questions, I...
Hello everybody. Please don't get me wrong, I am not asking to do my homework, 99% i found out and learned, but I have some questions where I got stuck. I have some exam, and a lot of the questions are radio communication based, which I never learned of wasn't really interested it. I found most...
Thanks everyone! Most of the time I work with 12V devices, so I never camed across this way of lovering 220V... Good to know! It was just like FvM said, only fuse was gone because of short in the lamp :).
Hello. My friend broght me this board for light that turns on and off automatically... I found that fuse is gone. Nothing is burnt, caps are tested and fine, diodes also... But this thing is unclear to me. I didn't see whole light, but he tells me it is connecting directly to 220V. And on this...
Unfortunately I didn't saw the whole system, but as I was told it is from old charger which can charge with 40 Amps or nothing (charging goes over contactor), it doesn't have regulation... Well I didn't write down the resistance values, I could do it. The thing that confuses me is that pin 3 of...
Hello. I received some 2 boards from some kind of old battery charger. I don't know are there any other boards that should be related to it. I drawed some kind of schematics, maybe i made some minor mistakes :(... Should this be some kind of comparator when switcher the charging on and off? When...
Hello. I am trying to repair radar PCB. As I can see everything is working fine. It wakes up when you connect yellow wire (as it should), voltage is present everywhere, indication leds lit fine... But It can't be seen on the network, so I suspect about some communication problem... It uses some...
Hello everybody. I am repairing boat chartplotter. So i need some advice. Let's say we have same manufacturer, only different sizes of screen. 7" screens have the same hadware board as 12" chartplotter. This one i received is 12", i found out that EMMC is gone. I have spare EMMC, but from 7"...
I didn't study the board layout so much, but as I saw theese mosfets are going directly to outputs (3 outputs for 3 different batterie banks). They dont have heatsinks, they are through hole mounted on the board. So my logic says that there cant be any voltage higher then 14.5 on source/drain of...
I am repairing battery charger. It has 6 STP180N55F3 mosfets, 3 are gone. Can I replace it with IRFB7440PBF? In datasheet they seem similar, except power discipation. STP180N55F3 says 300W, IRFB7440PBF says 208 but it has countinous dran current 208A while STP180N55F3 has 120A? I have some other...
Great idea. I will put a switch to it so that it can be turned off when leaving the boat. The boat is for rental purposes, so alarm is for guests actually when they are abusing the batteries...
Hello. I am building low battery buzzer alarm. I have done this guided by schematics and it works great. My question is is it reliable to leave it just like this in boat with few components? I see in the datasheet of lm339 that it can hande much bigger voltage then 12V (around 30) so I would put...
I found some usefull info regarding the extraction and programming of flash memory chips. The tool that electronic repair shops mostly use is RT809-H programmer with adater for 153/169 BGA chips. It is for eMMC, can it be used in this case if this chip is MLC as Zasto wrote?
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