just something I seen thats a bit alarming but not surprising....and 450v?
[URL]https://youtu.be/WhqKYatHW2E?t=461[/URL]https://just something I seen thats ...2E?t=461[/URL]
Cartel
Senior Member
Last Activity: 03-01-2024, 05:37 AM
Joined: 02-14-2006
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does ebay by the 1000s change the factor? -
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Re: Trying to repair Yaesu FP-707 power supply
I just finished installing ST tip3055 (3) and its working great. Thank you for the tip on the tip....Leave a comment:
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Re: Trying to repair Yaesu FP-707 power supply
ya I seen it say darlington and I just chose to ignore it. Live and learn but now I know to avoid them. Problem solved I hope
...
Last edited by Cartel; 04-17-2023, 08:27 AM.Leave a comment:
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Re: Trying to repair Yaesu FP-707 power supply
Thanks for all the replies.
I never really worked on power supplies too much.
I was hoping for a "quick fix". I did test each part and just replaced the diodes just because I had new ones in stock.
Well the darlingtons came up on a substitute list and digikey had plenty for cheap: [url]https://alltransistors.com/crsearch.php?mat=Si&struct=NPN&pc=80&ucb=70&uce=50&ueb=5&ic=10&tj=150&ft=5&cc=350&hfe=55&caps=TO247&cf=on[/url]
Digikey has 0 stock...Last edited by Cartel; 04-17-2023, 04:53 AM.Leave a comment:
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Re: Trying to repair Yaesu FP-707 power supply
Might not be out of the woods yet.
It doesnt seem to be regulating very well.Leave a comment:
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Re: Trying to repair Yaesu FP-707 power supply
false alarm I'm sorry.
The voltage adjust was cranked, its working fine.
whew!Leave a comment:
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Trying to repair Yaesu FP-707 power supply
I'm trying to fix this for my buddy. The power supply would power up, put out 13.8v but drop to 0v with any load.
He tried to fix it by replacing 3 caps in the "AVR" board, that didnt work.
I fired the parts cannon and replaced 3 "10D1" diodes with 3 "sk3081" diodes I had, a new 35 amp bridge rectifier, I tested all the other components and for the "2SA1012" was subed with a ECG "TIP53" and I replaced that with a "D45H8G" and same results, 13.8 and 0v under load.
I pulled the 2SD717 regulators and they all... -
Re: I need some 500v screw type capacitors. Kemet any good?
I ended up going with the kemet 330uf 500v
they fit perfect.
I may have made a wrong choice on the resistors though.
Do bleeder resistors need to be non inductive?
I used 50k 10w ohmites
[url]https://www.digikey.ca/en/products/detail/ohmite/20J50KE/2019980[/url]Re: I need some 500v screw type capa... choice on the...Leave a comment:
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Re: I need some 500v screw type capacitors. Kemet any good?
OK after a peek into the cover holes, I see these are actually 270uf
[URL="https://www.cde.com/resources/catalogs/DCMC.pdf"]DCMC271T450AA2B[/URL]
The reason I usually skip CDE is the low hour rating.
All the other Japanese and kemet are available up to 12000+ hours
but these still work after 20 years so I'm not sure what to do.
[URL="https://www.digikey.ca/en/products/detail/kemet/ALS30A331DF500/13176345?s=N4IgTCBcDaIIIBkDKBmADHFKCMARAYgKxpogC6AvkA"]oofta...Leave a comment:
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Re: purchasing caps from aliexpress
I bought from this seller several years back.
I needed those green mylar too which the coating was very poor.
the nichicon and united chemicon I got were fake, the silmic caps I got were date code 2003 and leaking green crud. That was 2016 and I learned my lesson: never buy caps unless its from digikey or mouser.
And I learned that lesson on this very site, which I am thankful. I had to go back and tear them all out.
Its just not worth it
[url]https://www.badcaps.net/forum/showthread.php?t=52256[/ur...Last edited by Cartel; 11-10-2022, 07:52 AM.Leave a comment:
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Re: I need some 500v screw type capacitors. Kemet any good?
Hey thanks for the replies.
They havent failed yet but its been 20 years so I thought I should at least buy them before the price triples or they become unavailable.
Digikey has tons of stuff out of stock for a long time now
My 1200 is dated 2002
I should do the resistors too, and even resistors are getting hard to source
[url]https://www.digikey.com/en/products/detail/te-connectivity-passive-product/ROX7J51K/9926357[/url]
The main reason I'm trying to go 500V is...Last edited by Cartel; 11-10-2022, 07:21 AM.Leave a comment:
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Re: HUGE caps
they are worth [URL="https://www.ebay.com/itm/353492668455"]$7[/URL]Re: HUGE caps
they are worth [URL="https://www.ebay.com/itm/353492668455"]$7[/URL]Leave a comment:
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I need some 500v screw type capacitors. Kemet any good?
I need to replace some caps in a ameritron al1200 and it has CDE screw type with .504" spacing.
I seen these: ALS30A221DE500
Its a bit steep and 200cad for 8
I also seen these: ALC40A221EC500 for half the price.
I'm not sure if the snap-in leads will work in this situation.
Any opinions of kemet and any advice on the fitment?
stock photo of the board I have to work with below.
thanks
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Re: Need tips in fixing APC 1500VA UPS having buzzing noise
Sorry to bump an old thread but I have bought a new APC 1500 BX1500M and it came today.
It buzzed on the battery power mode, and not just a soft buzz.
It also had a horrible transition time from AC mains to battery backup.
My old XS1000 from around 2011 does not buzz on battery power and the transition time is fast, almost not noticeable with a light bulb going.
I boxed it up and returned it within 4 hours of having it.
I suspect a stage of the inverter is open, a bad mosfet and...Leave a comment:
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Re: Würth Elektronik Electrolytic Capacitors Official Thread
I just bought some kemet for my old pyramid ps35
they gotta be better that the yec's that are in it.
I'm surprised the yec's made it this far...
That bullseye bung is a total letdown though...I hate those....Leave a comment:
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Anyone recognize this power supply?
Its 13.8v and unknown amps, 100?
There is no name and it has 5 identical modules in it.
Dont know where else to ask.
thanks
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Re: Digikey sold me caps that are over 4 years old
I didn't ask for a refund, I was going to send them back and buy Rubycons.
They just did it and refunded the 2700uf 25v caps on their own, I didn't even mention those to them....Leave a comment:
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Re: Digikey sold me caps that are over 4 years old
They refunded me for the 450v and the 25v that were 2014 and said to toss them.
I'm happy for that and will continue to use digikey.
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