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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion Yesterday, 06:42 PM
Replies: 15
Views: 156
Posted By redwire
Re: Help me with capacitors replacement

I would say it's a crappy soft-start circuit, the big resistor gets bypassed by the triac once the main filter caps are charged up, after the delay.
The board does not look repairable - the bridge...
Forum: Troubleshooting Audio Equipment Yesterday, 11:06 AM
Replies: 2
Views: 59
Posted By redwire
Re: AU101 Sansui amp schematic please

I find many old grey Elna electrolytics pretty much dead nowadays, they dry out and go low value. I'd replace them all.
You can compare DCV readings between channels. Two transistors are the phono...
Forum: Troubleshooting Audio Equipment 08-11-2022, 11:07 PM
Replies: 2
Views: 81
Posted By redwire
Re: Recapping a Cerwin Vega Crossover help

I see a 1.5uF 200VDC and 3.5uF film capacitors, and another small one underneath, and some others as well.
Those caps look fine and if they test reasonable, I would leave them alone. If they were...
Forum: General Electronics Technical Discussion 08-11-2022, 03:08 PM
Replies: 13
Views: 269
Posted By redwire
Re: Converting +/- 5v to a Usable Hz Signal

I see the wheel has already been invented. There are many aftermarket fan controllers for cars:
Summit Racing (https://www.summitracing.com/search/part-type/fan-switches) has several different makes...
Forum: Announcements & Related News 08-10-2022, 04:52 PM
Replies: 4
Views: 1,287
Posted By redwire
Re: Panasonic exits VRLA market

Panasonic VRLA were top quality, end of an era. There's nothing left but cheap chinese VRLA with not even 1/2 the lifetime. Just look inside, the lead plates look like they were made by kids, all...
Forum: General Capacitor Questions & Issues 08-10-2022, 04:37 PM
Replies: 29
Views: 756
Posted By redwire
Re: Blown cap on old dwell gauge - kal equip 2851

Dwell was used for setting point gap, this box can run off a 9V battery so it can do old small engines- moped, lawn mowers etc.

OP see if your multimeter is pooched. Measure ohms on some...
Forum: General Capacitor Questions & Issues 08-10-2022, 04:33 PM
Replies: 13
Views: 417
Posted By redwire
Re: Nichicon - discontinuing many electrolytic capacitor series

Digi-Key lists them as mass discontinuation, I think Nichicon might be trimming through-hole parts? Vanilla 1,000uF 25V 10mm dia parts listed as not for new designs.
But realistically, who here has...
Forum: Troubleshooting & Designing Networks 08-10-2022, 03:11 PM
Replies: 22
Views: 441
Posted By redwire
Re: Netgear = By far the most horrible support ever!

That looks pretty good, the support and docs (https://support.hpe.com/connect/s/product?language=en_US&tab=manualsAndGuides&kmpmoid=1010828164) for it pretty easy to find. The big brick 48V 1.75A 84W...
Forum: General Electronics Technical Discussion 08-10-2022, 02:52 PM
Replies: 13
Views: 269
Posted By redwire
Re: Converting +/- 5v to a Usable Hz Signal

You can reverse-engineer what is needed with not so much work. It's kind of two parts - knowing the engine temperature, and controlling the fan(s).
I have a peer who does ECU design and will ask...
Forum: General Electronics Technical Discussion 08-09-2022, 01:35 PM
Replies: 13
Views: 269
Posted By redwire
Re: Converting +/- 5v to a Usable Hz Signal

If I understand you, you want to add a variable speed feature to the older generation ECU on/off fan control?

Most cars use simple on/off control with a relay for the cooling fan(s). In stopped...
Forum: Troubleshooting & Designing Networks 08-08-2022, 01:08 PM
Replies: 22
Views: 441
Posted By redwire
Re: Netgear = By far the most horrible support ever!

Totally makes sense now: https://dilbert.com/strip/2022-08-08
Forum: General Electronics Technical Discussion 08-07-2022, 06:20 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

Those water tanks at 1,000L/275gal are large weight up to 1,060kg/2,332lbs.
But they have a small 6" fill cap lid which makes putting sensor and fill pipe inside a hassle.
.. uh make sure the stand...
Forum: General Electronics Technical Discussion 08-06-2022, 12:43 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

With a plastic tank, capacitive liquid level sensors that mount outside on the tank are popular.
XKC-Y26 (https://www.aliexpress.com/item/32797722906.html)/WS-03 can mount on a plastic pipe (with...
Forum: General Electronics Technical Discussion 08-05-2022, 10:48 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

I looked at the logic for the pump and fill valves and it's a bit weird.
It's like each tank has an empty/fill cycle, once empty the pump runs until it fills up.
But if you're filling one tank, and...
Forum: Troubleshooting & Designing Networks 08-05-2022, 02:32 PM
Replies: 22
Views: 441
Posted By redwire
Re: Netgear = By far the most horrible support ever!

It's a magic packet so changing the firmware I think would leave that door there. Doesn't matter really, others looking at my traffic I have nothing to worry about, it's pretty boring. huawei might...
Forum: General Electronics Technical Discussion 08-05-2022, 02:28 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

About what size are the tanks? As I mentioned, as long as the incoming water cannot pour down and hit the float sensors, or if there is not a lot of swirl and turbulence, they can work.
They are...
Forum: General Capacitor Questions & Issues 08-05-2022, 11:54 AM
Replies: 29
Views: 756
Posted By redwire
Re: Blown cap on old dwell gauge - kal equip 2851

The old burnt resistor was GREY-RED for the first two stripes, so it's 82 something something, either 8.2Ω or 82Ω yet you measure 5.0Ω on the burnt part. Hmmm.

I would put in 82Ω and see how it...
Forum: Troubleshooting & Designing Networks 08-05-2022, 10:16 AM
Replies: 22
Views: 441
Posted By redwire
Re: Netgear = By far the most horrible support ever!

What's worse - chinese backdoor in the product, junky capacitors, orphaned firmware, or no warranty?

Netgear does not have a clear list of approved retailers or authorized resellers. They want you...
Forum: General Electronics Technical Discussion 08-05-2022, 09:49 AM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

From OP's pic, it's a submersible pump in the well, with solenoids to divert flow to either of the two tanks. Usually there is a backflow valve to prevent siphoning/water running back down into the...
Forum: Troubleshooting & Designing Networks 08-04-2022, 01:36 PM
Replies: 22
Views: 441
Posted By redwire
Re: Netgear = By far the most horrible support ever!

That authorized NETGEAR reseller (https://www.netgear.com/business/where-to-buy/) list is bullshit, dozens of other vendors sell Netgear like Newegg, Dell, Source etc. and who knows who the...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-03-2022, 06:25 PM
Replies: 35
Views: 8,068
Posted By redwire
Re: Corsair CX400W 5vsb goes into safety loop

It looks like a MLCC terminal thermal crack but it includes the electrodes as well. Seems to be from a bad soldering process?
Gideon MLCC Failure Analysis...
Forum: General Electronics Technical Discussion 08-03-2022, 12:41 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

There's no money with water, it comes out of the well for free. If this was diesel, gasoline, food being pumped you could spend more than $10 on Aliexpress...
Forum: General Capacitor Questions & Issues 08-02-2022, 11:30 PM
Replies: 3
Views: 118
Posted By redwire
Re: this look defective to you?

SamXon? :spank: It does look a little prego but some circuits won't provide enough power for a bad cap to really gas up and go really plump. I'd test it and outright replace that lousy brand anyhow.
Forum: General Electronics Technical Discussion 08-02-2022, 11:26 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

Contactors commonly have a mains-voltage AC coil. This is because they need a lot of power to pull in hard and fast, there is high inrush current until the armature pulls in and the magnetic circuit...
Forum: General Electronics Technical Discussion 07-29-2022, 03:56 PM
Replies: 63
Views: 1,296
Posted By redwire
Re: Another water pump automation project (suggestions ?)

You can also split the project in two. First get a PLC and panel/HMI built, then later add the webserver/gateway - as long as the PLC is capable of external comms.
I looked at PLC Internet Gateway...
Showing results 1 to 25 of 500

 
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