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Search: Posts Made By: redwire
Forum: General Capacitor Questions & Issues Yesterday, 11:39 PM
Replies: 3
Views: 23
Posted By redwire
Re: Nichicon radials without the X vent?

I have some UPW1E100MDD6 from Digikey. (https://www.digikey.com/product-detail/en/nichicon/UPW1E100MDD6/493-1810-ND/589551) No X vent, and no flat bung, and N621 text as well. The white printing is...
Forum: General Electronics Technical Discussion 02-13-2019, 09:24 PM
Replies: 20
Views: 173
Posted By redwire
Re: Measuring crystal oscillators with scope ?

Ceramic resonators are lower cost and tougher than quartz crystals, but not as accurate on frequency. The 3-pin parts have built-in loading capacitors.

A scope probe has capacitance and loads down...
Forum: General Computer Discussion 02-12-2019, 07:16 PM
Replies: 12
Views: 147
Posted By redwire
Re: "Save Image As" I always get a 25KB .jpg that is HTML

It happens on other websites, "Save Image As" generates an image filename .jpg or .png - but the file is not an image file, it is HTML.

Unable to upload two image saves from Badcaps threads as...
Forum: General Electronics Technical Discussion 02-11-2019, 07:15 PM
Replies: 58
Views: 483
Posted By redwire
Re: Car LED Headlights dimmer?

You can lower the buck-converter output current by removing one or two of the three sense resistors R2, R3, R4 that are 0.25R each.
If the 6-pin IC is QX9920, roughly... all three = 3A, two = 2A,...
Forum: General Electronics Technical Discussion 02-11-2019, 05:59 PM
Replies: 58
Views: 483
Posted By redwire
Re: Car LED Headlights dimmer?

A picture of the pcb inside the LED lamp would help.
BigClive did a teardown of one with a fan on the end and datasheets of QX9920 IC and sch.
https://www.youtube.com/watch?v=CX_uFs5vKc0
Forum: General Electronics Technical Discussion 02-11-2019, 03:38 PM
Replies: 58
Views: 483
Posted By redwire
Re: Car LED Headlights dimmer?

I think we're assuming the LED headlamp is like a light bulb, a linear load.
But inside is most likely a boost/buck converter.

So supplying the LED lamp with 10V or 15V should give the same...
Forum: General Electronics Technical Discussion 02-08-2019, 12:42 PM
Replies: 58
Views: 483
Posted By redwire
Re: Car LED Headlights dimmer?

Did you check and adjust the cutoff?
With retro-fits, low beam ends up is too high and blinds oncoming drivers.
This might be "too bright" - instead of it being the LED brightness.
It's really...
Forum: General Computer Discussion 02-07-2019, 11:41 PM
Replies: 12
Views: 147
Posted By redwire
Re: "Save Image As" I always get a 25KB .jpg that is HTML

Click on Badcaps post that has an attachment: https://www.badcaps.net/forum/attachment.php?attachmentid=189425&d=1548445387

"Save Image As": get a wrong 25KB HTML file

"View Image Info": ...
Forum: General Computer Discussion 02-06-2019, 02:41 PM
Replies: 12
Views: 147
Posted By redwire
"Save Image As" I always get a 25KB .jpg that is HTML

In my browser, when I right click "Save Image As" I always get a 25KB .jpg file saved. It's not .jpg I can't open it.
The file is actually Badcaps HTML :why:

I'm using Firefox 61.0.1 with Adblock...
Forum: General Electronics Technical Discussion 02-06-2019, 02:28 PM
Replies: 26
Views: 302
Posted By redwire
Re: gas cooker ignition

Silicon Carbide Hot Surface Igniter operates white hot 1800F and knowing its resistance would not tell you if a flame is present.
All metal's resistance increases with temperature. Burner...
Forum: General Electronics Technical Discussion 02-06-2019, 01:34 PM
Replies: 26
Views: 302
Posted By redwire
Re: gas cooker ignition

A gas stove/range/cooker does not need flame sense.

In gas appliances such as furnace, hot water heater, clothes dryer etc. the igniter electrode is also the flame sensor electrode.
The Kanthal...
Forum: General Capacitor Questions & Issues 02-04-2019, 06:34 PM
Replies: 2
Views: 134
Posted By redwire
Re: Chemi-Con caught price fixing

17 years of price fixing and Nichicon joined the conspiracy for around 10 years, getting a $42M criminal fine.
Forum: General Electronics Technical Discussion 02-04-2019, 01:08 AM
Replies: 26
Views: 302
Posted By redwire
Re: gas cooker ignition

It is probably like a motorcycle wasted spark ignition, where one floating secondary connects to two spark plugs. So this igniter has two secondaries, four terminals.
Forum: Troubleshooting Audio Equipment 02-02-2019, 06:03 PM
Replies: 66
Views: 630
Posted By redwire
Re: Another Yamaha

Why would someone repeat the work others have done, reading the schematics, interpreting 160/129 etc.

You've cross-posted the same repair to at least two other forums:...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-02-2019, 04:34 PM
Replies: 6
Views: 179
Posted By redwire
Re: Oscilloscope kits

I had to laugh, youtube vids of DSO-138's that died after running for a minute...

https://jyetech.com/Products/LcdScope/e138.php
"If you are thinking to purchase DSO138 it is suggested to...
Forum: General Electronics Technical Discussion 02-02-2019, 04:06 PM
Replies: 77
Views: 714
Posted By redwire
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

BMS boards are only a few dollars. Look at 4S 30A 14.8V li-ion battery BMS using S-8254AA protection IC. They have pack over-current and over-discharge, over-charge protection.
Forum: General Electronics Technical Discussion 02-01-2019, 03:10 PM
Replies: 10
Views: 140
Posted By redwire
Re: optical convex lens?

It has to be flexible (silicone rubber) because of the temperature swings. Hard epoxy just cracks.

24hr cure for a big blob or thick run, and 1hr for thin films. It's the thickness that mainly...
Forum: General Electronics Technical Discussion 01-31-2019, 08:40 PM
Replies: 77
Views: 714
Posted By redwire
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

The Lii-202 tests show going above 1.55Vpc and "With NiMH the charger turns off current to measure the voltage and will terminate on voltage without doing a top-off charge. This means the batteries...
Forum: Troubleshooting Audio Equipment 01-31-2019, 08:33 PM
Replies: 3
Views: 73
Posted By redwire
Re: Yamaha RX-A730 VFD power supply issue

I would check the switching frequency is around 100kHz and if the previous transistors shorted, it might have cooked L3001 100uH or weakend the switch Q3011. There should be around 5.6V coming in.
...
Forum: General Electronics Technical Discussion 01-31-2019, 08:16 PM
Replies: 77
Views: 714
Posted By redwire
Re: Directly replacing NiMh cells with Li-Ion cells - bad idea ?

I replaced NiCd AA pack with Energizer, Eneloop, Eneloop Pro, Ladda AA NiMh batteries.

The problem is the NiMh pack loses capacity after a month ~20 cycles. It seems to be the charger's voltage...
Forum: General Electronics Technical Discussion 01-30-2019, 08:21 PM
Replies: 12
Views: 177
Posted By redwire
Re: Variable soldering iron heater construction and operation questions

I can't see the other end, but I think the heater wire is doubled-up for the center run, so it doesn't heat up. You want the outside coil as the heater, not the center run glowing orange hot.
It's...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-30-2019, 08:08 PM
Replies: 18
Views: 592
Posted By redwire
Re: Fluke 289 bad supercapacitor replacement repair

I see- as an extra seal to protect against future leaks. I'm not sure what the acid is, as silicone sealant dissolves in sulfuric acid and puffs up in nitric and acetic acid. Larger supercaps can...
Forum: General Electronics Technical Discussion 01-30-2019, 07:44 PM
Replies: 12
Views: 177
Posted By redwire
Re: Variable soldering iron heater construction and operation questions

24VAC soldering station controllers use "bang bang" control.

PID control is not useful because there is a huge delay caused by the thermal resistance from the heating coil to the tip, and the tip...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-30-2019, 04:00 PM
Replies: 18
Views: 592
Posted By redwire
Re: Fluke 289 bad supercapacitor replacement repair

For Fluke 289 jack-detect DS2, any top-emitting 0805 IR LED will work, just not too high to hit jack diffuser when you assemble everything.

Original is mentioned as OSRAM SFH 325 FA-3/4-Z series,...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-30-2019, 03:58 PM
Replies: 18
Views: 592
Posted By redwire
Re: Fluke 289 bad supercapacitor replacement repair

The supercap electrolyte is acidic and it eventually corrodes through the case and causes a lot of damage. Putting RTV over that, uh just a mess for a few dollar part in an expensive multimeter.
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