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Search: Posts Made By: redwire
Forum: Troubleshooting Audio Equipment Yesterday, 04:07 PM
Replies: 3
Views: 49
Posted By redwire
Re: Pioneer turntable tone arm adjustment

It's usually due to a bent rod in the mech, or the cam has rotated. If someone was rough with the tonearm, or a kid trashed it. It must be more than a few mm out.
There would be no adjustments...
Forum: General Electronics Technical Discussion 08-17-2022, 09:25 PM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

It's your usual chinese dream, you have to derate it a lot to make it last.
Max. is 24VAC input but under a light load transformers put out higher voltage. So say 28VAC which gives around 38VDC, add...
Forum: General Electronics Technical Discussion 08-17-2022, 05:12 PM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

It's weird, the board has a 24VDC regulator 7824 for a 40mm? fan yet none of them come with a main heatsink or fan, like in the pic. There is a small heatsink for the driver transistor included. ...
Forum: General Electronics Technical Discussion 08-17-2022, 10:55 AM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

The low cost chinese 0-30V 2mA-3A power supply boards do not work if you feed them DC. They only work with a power transformer because they make a -5V rail for the op-amps from the cap+diode AC...
Forum: Troubleshooting Audio Equipment 08-16-2022, 09:17 PM
Replies: 5
Views: 138
Posted By redwire
Re: Power button on mixer dead ?

It's not a problem with the power switch, that is all or none for power. Some power is present if the phantom red LED is on, so the switch is not to blame.

Your electronic expert friend would have...
Forum: General Electronics Technical Discussion 08-16-2022, 04:40 PM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

Another option is to power it from an old laptop brick. These are typically 19VDC at a few amps.
Forum: General Electronics Technical Discussion 08-15-2022, 09:45 PM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

It's a 1970's design, the regulator board. Changing over to an IC like LM317 (1A) or LT1084 (5A), along with a big heatsink would be best. Or that chinese power supply board does OK too, it is from a...
Forum: General Electronics Technical Discussion 08-15-2022, 11:08 AM
Replies: 24
Views: 387
Posted By redwire
Re: Old analog Power Supply needs your advice

I'd guess a 20 to 25VAC transformer is missing, would connect to the purple wires.
The regulator is no good - there is no heatsink for the power transistors which will get really hot. I don't know...
Forum: General Electronics Technical Discussion 08-14-2022, 02:14 PM
Replies: 32
Views: 465
Posted By redwire
Re: Help me with capacitors replacement

I can't see upsizing the bridge rectifier because of the high (mains) voltage and the PC board bad design mean the spacings simply are not good enough. You need a couple mm at least or it will just...
Forum: General Electronics Technical Discussion 08-12-2022, 06:42 PM
Replies: 32
Views: 465
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 08-12-2022, 11:06 AM
Replies: 2
Views: 92
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: 106
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: 338
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: 1,299
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: 829
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: 471
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: 28
Views: 613
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: 338
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: 338
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: 28
Views: 613
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: 1,469
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: 1,469
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: 1,469
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: 28
Views: 613
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: 1,469
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...
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