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Search: Posts Made By: redwire
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 09:56 PM
Replies: 7
Views: 126
Posted By redwire
Re: S-10-5 power supply schematic etc. 5V 2A

The problem with these smaller power supply modules, they're always missing parts to be cheap.
I look for: a fuse, common-mode choke/X-cap for EMC, NTC and decent sized primary cap. It's too much to...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 01:37 PM
Replies: 7
Views: 126
Posted By redwire
S-10-5 power supply schematic etc. 5V 2A

I got a 5V 2A power supply for some hobby projects from Aliexpress store YXD Wish (https://www.aliexpress.com/item/1005001855183032.html) for about $4. S-10-5 and the build quality good, solder blob...
Forum: Troubleshooting Audio Equipment 11-15-2021, 12:45 PM
Replies: 17
Views: 419
Posted By redwire
Re: Onkyo HT-R510 turns on and then immediatly off

I found repairing Onkyo 636 that grounding through the back plate is needed for some boards. It kept powering down after a few seconds, on the bench. Added jumper clips from HDMI/RCA jacks and it...
Forum: General Electronics Technical Discussion 11-10-2021, 02:04 PM
Replies: 18
Views: 474
Posted By redwire
Re: Duracell Battery Charger - CEF22GBL-3

I bought an Energizer ENC-2A car battery 2A charger/maintainer and played around with it and found out the software was terrible.
It would not start charging unless the battery passed a little test...
Forum: General Capacitor Questions & Issues 11-09-2021, 02:18 PM
Replies: 119
Views: 57,446
Posted By redwire
Re: How to Recondition (Reform) Electrolytic Capacitors and Why

It does depend on the type of equipment you have.
Some gear is high stress for the electrolytic capacitors such as a VFD motor drive or SMPS, which I would say yearly or every two years power-up is...
Forum: General Electronics Technical Discussion 11-09-2021, 12:18 PM
Replies: 91
Views: 4,579
Posted By redwire
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

The cell voltage is based on the chemicals used in the battery. Lithium has a high potential, you'll usually see 3.7-4V and here Energizer did get it down using iron-disulfide.

I mentioned the...
Forum: General Electronics Technical Discussion 11-08-2021, 03:42 PM
Replies: 91
Views: 4,579
Posted By redwire
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

Price out using Energizer ultimate lithium cells, at first they look more expensive but they have longer life. And start out a bit higher voltage 1.8V but say almost 2x price yet 3x capacity.
I...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-08-2021, 03:35 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

I think it's not about being new- it's about not wrecking your LED project or the board you're repairing figuring it out as you go, kind or thing. Some people use scissor jacks to lift up the board,...
Forum: General Electronics Technical Discussion 11-08-2021, 03:22 PM
Replies: 91
Views: 4,579
Posted By redwire
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

Alkaline batteries internally make hydrogen gas when they're discharging due to use or storage, or see reverse polarity (imbalanced string). They need to burp.
Problem is that also spits out caustic...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-06-2021, 12:04 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

How are people getting the hot pc board off the plate? My luck, I would bump it and have parts all over the place. There needs to be a lift or something?

clearchris, can you measure ohms cold and...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-05-2021, 08:39 PM
Replies: 46
Views: 1,431
Posted By redwire
Re: I need a charger schematic YLT6722000

The charger is pretty much at the max. for low cost architecture using a flyback converter for 135W. At this power level, the design has to be well done but this one is basic and low cost.

Under...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-05-2021, 03:30 PM
Replies: 46
Views: 1,431
Posted By redwire
Re: I need a charger schematic YLT6722000

FR207 (https://www.mouser.com/datasheet/2/395/FR201-231688.pdf) diode datasheet calls them (FR107,207,307) "fast recovery" but not really. It's a bit slow, rated 500nsec recovery. Higher voltage...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-03-2021, 12:16 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

People are using stoves, electric frying pans, steam irons, waffle irons etc. as hot plates.
These seem to be a PTC element wrapped in Kapton tape and then stuffed into the aluminum base.
One...
Forum: General Electronics Technical Discussion 11-02-2021, 05:09 PM
Replies: 18
Views: 474
Posted By redwire
Re: Duracell Battery Charger - CEF22GBL-3

Duracell does have a long "guarantee" on these I think 7 years so maybe hit them up for a replacement. Not sure how they are in the UK for consumer protection.
Wild guess is whatever modulates the...
Forum: General Capacitor Questions & Issues 11-02-2021, 05:00 PM
Replies: 8
Views: 445
Posted By redwire
Re: Do bad capacitors stink?

I came home to electrolytic capacitor stink for months, then it went away, then it came back. Gutted all my equipment to find it and eventually it was the ZyXEL DSL modem supplied by my ISP.
Inside...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-02-2021, 04:52 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

For a constant resistance, 1/2 the voltage gives 1/4 the power.
But these things have a PTC non-linear resistance and hard to tell what power and temperature it will settle into steady state. I...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-31-2021, 04:57 PM
Replies: 30
Views: 824
Posted By redwire
Re: Motor control board

Either the -15V rail has wimped out and collapsed, or something is overloading the -15V regulator. It's not good for IC's and semi's power if a -ve rail goes +ve. I would put a reverse diode from...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-31-2021, 04:46 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

I've worked with LED's on aluminum MCORE pc boards, using hot air. It takes a lot of heat and too much will burn the LED melt the silicone lens.
Now I blast hot air on the backside to stop that from...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-30-2021, 05:10 PM
Replies: 40
Views: 3,562
Posted By redwire
Re: New Cheap Chinese Soldering Plates

All of these heat plates are rated 220V. Looks like only one factory in china lol.
I don't know if the PTC works good enough for 110VAC operation? Don't get fooled by the 110V plug.
Forum: General Electronics Technical Discussion 10-29-2021, 10:14 PM
Replies: 91
Views: 4,579
Posted By redwire
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

It's your fault they leaked:
They were dead.
You put them in backwards.
You mixed old and new cells.
They were past their expiration datecode.
You bought our cheap shit batteries in the first...
Forum: General Electronics Technical Discussion 10-29-2021, 10:08 PM
Replies: 18
Views: 474
Posted By redwire
Re: Duracell Battery Charger - CEF22GBL-3

Just a spammer.
Does the charger have a single 9V port? You could follow that back to the PC board and see what mosfets they are using for switches there. I imagine it's easy to connect one...
Forum: General Electronics Technical Discussion 10-28-2021, 12:43 PM
Replies: 91
Views: 4,579
Posted By redwire
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

I took Duracells apart as well as Energizer alkalines, and the seal construction is almost identical. A polypropylene piston-cup with bitumen ring. Many patents on the design so it would be hard to...
Forum: General Electronics Technical Discussion 10-28-2021, 12:26 PM
Replies: 18
Views: 474
Posted By redwire
Re: Duracell Battery Charger - CEF22GBL-3

EM78P37x is Elan Microelectronics 8-bit OTP MCU, I think 4KB ROM for the 374.
It's a MCU custom programmed for this application. You'd have to draw the schematic, I've never seen anything published...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-17-2021, 11:38 PM
Replies: 8
Views: 509
Posted By redwire
Re: Radio Shack 2200813 29 range DVM

Strange it has only one switch position for the mA/A function, so the shunt R14 is very likely 1R. 99R is typically used for a uA function.
RAA1, RAA2 give 10R but there's no switch position to use...
Forum: General Electronics Technical Discussion 10-16-2021, 10:00 PM
Replies: 21
Views: 1,910
Posted By redwire
Re: SPIM08HP 3.7V 16AH Battery which can handle 200 amp pluses Battery Hookup

What does this mean "proper compression"? You have to squish them?

"...THESE CELLS ARE RATED FOR 200A CONTINUOUS EACH WITH PROPER COMPRESSION. YOU CAN SIMPLY USE THREADED RODS IN THE CORNERS OF...
Showing results 1 to 25 of 500

 
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