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Search: Posts Made By: redwire
Forum: Other Devices with Bad Capacitors 01-26-2020, 07:33 PM
Replies: 14
Views: 4,813
Posted By redwire
Re: Refrigerator Control Board WPW10310240

Um, the one cap 10uF 50V top of the pc board looks like the pads are shorting or a blob is there. It doesn't look so great. You really need a solder sucker/wick to do this kind or work, yanking them...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-24-2020, 02:23 PM
Replies: 48
Views: 587
Posted By redwire
Re: Manson NP-9613

oops my bad PSU output (+) is the common for the op-amps and control power, typed it wrong.
Either way, the voltage difference across ZD2 5.6V seems to be zero, for the op-amp's -ve rail. I would...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-23-2020, 06:44 PM
Replies: 48
Views: 587
Posted By redwire
Re: Manson NP-9613

If the output goes to zero when the high-tap relay clicks, then I would check the transformer winding and bad solder joints there and the relay contacts too. It's common the relay contacts arc and go...
Forum: General Capacitor Questions & Issues 01-23-2020, 04:00 PM
Replies: 18
Views: 243
Posted By redwire
Re: GW GOS 3310 oscilliscope

Those eBay caps seem expensive and for audiophile use.

I would consider:
Kemet axial 0.47uF 2000VDC (https://www.digikey.com/product-detail/en/kemet/C4CAWUD3470AA1J/399-13869-ND/6558697) 44mm...
Forum: General Capacitor Questions & Issues 01-22-2020, 01:28 PM
Replies: 18
Views: 243
Posted By redwire
Re: GW GOS 3310 oscilliscope

Electrolytics can't go higher than around 450-500VDC, so for big HV caps I guess oil was used.
I haven't taken one apart, but yes oil like motor starting caps. Some Marcon's have a rubber bung,...
Forum: General Capacitor Questions & Issues 01-22-2020, 12:52 PM
Replies: 18
Views: 243
Posted By redwire
Re: GW GOS 3310 oscilliscope

The Marcon brand ones have a hard epoxy seal and no rubber bung.
These old axial caps have no safety vent, but I don't think the oil actually makes gas, unlike electrolytics. I'm not sure what the...
Forum: General Capacitor Questions & Issues 01-21-2020, 09:31 PM
Replies: 18
Views: 243
Posted By redwire
Re: GW GOS 3310 oscilliscope

Just lift a leg and test the capacitors' value and for leakage. I see oil-filled capacitors in oscilloscope HV section just don't last. Marcon's in Leader oscilloscopes are notorious for failing....
Forum: General Electronics Technical Discussion 01-19-2020, 09:53 PM
Replies: 23
Views: 312
Posted By redwire
Re: Let's talk about SCADA

The hassle is triggering I/O points, either by using lots of wires and switches, or in software. You can't simulate the entire system at your desk sometimes.
But it saves so much time checking the...
Forum: General Capacitor Questions & Issues 01-19-2020, 12:03 AM
Replies: 12
Views: 280
Posted By redwire
Re: Panasonic FC series - leaking? quality gone?

6201MC, DF is 0.25, ESR is good.
Forum: General Electronics Technical Discussion 01-18-2020, 06:00 PM
Replies: 6
Views: 233
Posted By redwire
Re: How to take apart fans to oil them?

I've used syn motor oil 10W20 for years to oil fans, electric motors etc. with zero problems or re-do's.
On a few I tried fancy (=expensive) aerospace lube. Krytox...
Forum: General Capacitor Questions & Issues 01-18-2020, 05:42 PM
Replies: 12
Views: 280
Posted By redwire
Re: Panasonic FC series - leaking? quality gone?

The bung hasn't even been through reflow or any soldering.
It's a high-end part with AEC-Q200, 5,000hrs 105C and last time I saw this was on 30 year old Spragues. I emailed Panasonic to see if they...
Forum: General Electronics Technical Discussion 01-17-2020, 04:42 PM
Replies: 23
Views: 312
Posted By redwire
Re: Let's talk about SCADA

I used GE Cimplicity HMI, (https://www.ge.com/digital/applications/hmi-scada/cimplicity) I think $5,000 for a dongle. The GE ecosystem is crazy expensive, especially for the nuclear power/coal plant...
Forum: General Electronics Technical Discussion 01-17-2020, 02:51 PM
Replies: 23
Views: 312
Posted By redwire
Re: Let's talk about SCADA

It sounds like a good project, it could be fun. Although water sensors are not very reliable. Some SCADA projects work terrible only because the sensors are terrible. I usually upgrade any sensor...
Forum: General Electronics Technical Discussion 01-17-2020, 01:10 PM
Replies: 23
Views: 312
Posted By redwire
Re: Let's talk about SCADA

The hard part is understanding the old control logic and wiring.
Is this a split bridge? There's extra code to deal with one end malfunctioning (thanks for wrecking my yacht) and collisions, power...
Forum: General Capacitor Questions & Issues 01-17-2020, 12:58 PM
Replies: 12
Views: 280
Posted By redwire
Panasonic FC series - leaking? quality gone?

New Panasonic FC series cap I got from Digikey, tossed it in the parts bin a year ago. Today, I saw the leads have green corrosion on both leads at the bung?!
It this leaking, yet never used?...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-15-2020, 11:38 PM
Replies: 19
Views: 297
Posted By redwire
Re: 12V, 1.5A PSU Adaptor Inductor Overheating

If the CM choke has say 0.4V across each winding that is say 1 ohm, then it's around 0.32W it is dissipating and I would not expect it to get way hot. Manufactures will sometimes stuff in the highest...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-15-2020, 11:29 PM
Replies: 17
Views: 292
Posted By redwire
Re: DC Ceiling Fan Motor Controller / receiver

I'd measure ohms from the FAULT pin to VSS, to see if the big IC has failed. It's only supposed to assert FAULT as long as VSS is low, under 13.5V or motor overcurrent - but that one clears when...
Forum: General Electronics Technical Discussion 01-15-2020, 04:42 PM
Replies: 23
Views: 312
Posted By redwire
Re: Let's talk about SCADA

You start with the I/O (point) count - how many digital in's/out's, analog in's/out's. This tells you how big the control system need to be. If the site wiring diagrams and floor plan are up-to-date,...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-14-2020, 05:17 AM
Replies: 19
Views: 297
Posted By redwire
Re: 12V, 1.5A PSU Adaptor Inductor Overheating

0.7A is pretty much the limit for most of those CM chokes around 5mH or less, it depends on the technology (nanocrystaline vs ferrite). I think the DCR around 1/2 ohm makes the heat. They are rated...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-13-2020, 11:06 PM
Replies: 19
Views: 297
Posted By redwire
Re: 12V, 1.5A PSU Adaptor Inductor Overheating

I would look for an open rectifer diode, or low ohms value NTC inrush limiter, or some other reason the ripple current is so high through the inductor.
There's two electrolytic caps on the primary...
Forum: General Electronics Technical Discussion 01-13-2020, 04:15 PM
Replies: 5
Views: 151
Posted By redwire
Re: Has anyone used this OWON B41T+ True RMS measurement, Bluetooth BLE 4.0 Android

Sigrok (https://sigrok.org/wiki/Supported_hardware) is really good open-source free software to communicate with lots of test equipment. Very few wireless (only 2 right now) Bluetooth multimeters in...
Forum: General Electronics Technical Discussion 01-12-2020, 07:33 PM
Replies: 5
Views: 151
Posted By redwire
Re: Has anyone used this OWON B41T+ True RMS measurement, Bluetooth BLE 4.0 Android

The input protection is fragile, bare bones- on par with the ANENG, low end Unit-T multimeters. It died with a basic test, 233VDC in while turning the function switch, I think.
Not sure how the...
Forum: General Electronics Technical Discussion 01-10-2020, 04:08 PM
Replies: 27
Views: 439
Posted By redwire
Re: Need a circuit that switches ON when a 5 volt source drops to 4 volts or less

Connecting a transistor as you have drawn will make smoke :poof:
People want help - but "give me the answer" instead of "I'm trying to learn more about electronics".
The difference is a person will...
Forum: General Electronics Technical Discussion 01-09-2020, 03:15 PM
Replies: 25
Views: 312
Posted By redwire
Re: Need to design an IR Receive amplification circuit for digital processing

We don't know how OP is measuring the pulse voltages. With a multimeter it's averaged and doesn't tell you much.
OP is also thinking a weak signal means less signal swing which is not the case with...
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-09-2020, 12:51 PM
Replies: 35
Views: 451
Posted By redwire
Re: Wash machine dead help.

It's very hard to work on boards with a conformal coating, you need sharp needle probes for the multimeter.

But I see damage and corrosion? in the corner by J3/J12 what happened there. One part...
Showing results 1 to 25 of 500

 
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