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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion Today, 10:37 PM
Replies: 26
Views: 584
Posted By redwire
Re: Help identify component

It won't start charging unless a battery is present.
The SCR's will stay off until the UJT starts oscillating and driving the trigger transformer- which needs power downstream of the SCR's.

You...
Forum: General Electronics Technical Discussion Yesterday, 10:23 PM
Replies: 26
Views: 584
Posted By redwire
Re: Help identify component

OK your datasheet pic is showing a transistor style TO-18 pinout :confused: I've seen many different pinouts for the 2N2646 on the Web.
You can ID the emitter as (+) on multimeter diode-test and...
Forum: General Electronics Technical Discussion 12-13-2019, 11:16 PM
Replies: 26
Views: 584
Posted By redwire
Re: Help identify component

2N2646 pinout seems to be an oddball metal can, non-standard TO-18 case. TO-18 (UJT) so the tab is at a weird angle compared to the typical transistor TO-18 configuration. Note they use bottom view...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-13-2019, 02:33 PM
Replies: 10
Views: 209
Posted By redwire
Re: PSU For CCTV - noise or interference in the image seen from the camera

It looks like a bad design power supply, noisy and high EMI. chinese special low cost.
There is no opto-coupler? So I'm not sure how it isolates and regulates.

I would put in a larger Y-cap C7 at...
Forum: General Electronics Technical Discussion 12-11-2019, 12:02 PM
Replies: 4
Views: 135
Posted By redwire
Re: Car Ammeter

OP I think you've asked the same question before:
https://www.badcaps.net/forum/showthread.php?t=68684
https://www.badcaps.net/forum/showthread.php?t=45512

I remember seeing a circuit in an...
Forum: General Capacitor Questions & Issues 12-09-2019, 04:30 PM
Replies: 2
Views: 66
Posted By redwire
Re: Which voltage is this 1uF Matsushita film capacitor?

Panasonic has only two lines of film capacitors, PP and polyester.
I think you'd have to check part's size, there's no info on marking codes.
105=1uF, K=10% and "CDI" might mean capacitive...
Forum: General Electronics Technical Discussion 12-09-2019, 04:17 PM
Replies: 7
Views: 115
Posted By redwire
Re: Ring Doorbell Solar Panel Battery Pack Modified

Something is storing the video...
Ring Ltd. shares package thieve/porch pirate video to law enforcement, so it is getting popular. They want to add AI for facial recognition.

There's lots of...
Forum: General Capacitor Questions & Issues 12-08-2019, 02:51 PM
Replies: 3
Views: 83
Posted By redwire
Re: Mitre Saw start capacitor

You should get continuity across the motor's terminals at the brushes.
If you don't, try turn the shaft (by hand, it's unplugged) in case there is a dead spot.
Sometimes a brush wears out, or they...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-07-2019, 02:29 PM
Replies: 29
Views: 424
Posted By redwire
Re: Powering up a Car Antenna a "different" way

When you connect the battery (nothing on green relay coil wire) , the antenna should (now) move down and then stop, as it goes past the limit switch which disconnects the motor.
Instead, it's not...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-05-2019, 03:06 PM
Replies: 29
Views: 424
Posted By redwire
Re: Powering up a Car Antenna a "different" way

First use a felt pen and put some dots/stripes 1,2,3,4 on the blue wires, so they don't get mixed up.

I think this is right:
Swap the two wires at the motor's terminals. (D2 and B2)
Swap the two...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-04-2019, 02:48 PM
Replies: 29
Views: 424
Posted By redwire
Re: Powering up a Car Antenna a "different" way

With nothing to the relay coil (green), see the diagram- it shows power can flow to the motor until the antenna-down limit-switch upper contact opens and disconnects the motor power.

With the...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-04-2019, 12:53 AM
Replies: 29
Views: 424
Posted By redwire
Re: Powering up a Car Antenna a "different" way

The limit switch is what latches power and keeps the motor running until it reaches an endstop. Not SPDT but it shorts the two ends until an endpoint. No need for diodes then.
Schematic might look...
Forum: Troubleshooting Game Consoles & Other Weird Devices 12-03-2019, 01:35 PM
Replies: 13
Views: 196
Posted By redwire
Re: Help needed identifying a component - AEG Convection Microwave

I see a 12V SMPS with TOP257 IC. Can't see a fuse, is it for this section or the magnetron, the one that is blowing?
That's the SMP transformer, which is custom part for the oven. They don't fail...
Forum: General Capacitor Questions & Issues 12-03-2019, 01:29 PM
Replies: 9
Views: 261
Posted By redwire
Re: What value is this capacitor?

It will not do anything if there is an open light bulb, that charges the cap in series with the 150 ohm resistor I think.
You can't use a timer IC or electronics here because it's a two-prong part....
Forum: Other Devices with Bad Capacitors 12-02-2019, 11:54 PM
Replies: 70
Views: 3,263
Posted By redwire
Re: Whirlpool Refrigerator LED lights flickering

I worry the door switches can handle the inrush currents for a larger SMPS?

It's too bad we don't have one of these boards to sketch a schematic, or know any of the semiconductor part numbers.
Forum: Troubleshooting Power Supplies and Power Supply Design 12-02-2019, 11:36 PM
Replies: 41
Views: 423
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

It's so you can take out the board and put it back in, without screwing up the connectors. Did you notice four are all the same 2-pin connector and can get mixed up!
I use a felt pen and put a...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-01-2019, 12:42 PM
Replies: 239
Views: 8,764
Posted By redwire
Re: Soldering station thoughts and guidelines

It was Hakko's idea, T12 came from the patent, now expired: US 6087631 (https://patents.google.com/patent/US6087631A/enhttps://patents.google.com/patent/US6087631A/en)
It's just a spot weld with a...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-01-2019, 01:47 AM
Replies: 41
Views: 423
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

There's many different ways to troubleshoot something. You can take measurements with power on, you can remove parts and test them.
You can guess the bad parts and change them. Some people start at...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-01-2019, 12:24 AM
Replies: 41
Views: 423
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

There is an electrocution hazard when taking measurements off a live board that is flopping around.
Check if you are OK with your experience level and the dangers of working on mains-powered...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-30-2019, 10:17 PM
Replies: 41
Views: 423
Posted By redwire
Re: Wine Enthusiast wine cooler, no power. Model # 272 03 29

For the technical guys, there are hand drawn bits and pieces of the board's schematic on the Web. I did find this "roughly similar" schematic, at least to help understand the basics.

It looks like...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-30-2019, 01:25 PM
Replies: 113
Views: 2,733
Posted By redwire
Re: DPS5020 dual power supply build

It turns out dual-switch contacts are never identical, so one will close last (power-on inrush current) and another will open last (power-off arc). I had a boss yell at me that it would not last any...
Forum: General Capacitor Questions & Issues 11-30-2019, 01:14 PM
Replies: 34
Views: 489
Posted By redwire
Re: Tumble Dryer start capacitor

The motor has an open-circuit on the black wire, take it apart.
You might be able to find the break and do surgery to fix it. Or just get a replacement motor. It might be broken from a tug on its...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-30-2019, 01:07 PM
Replies: 2
Views: 112
Posted By redwire
12V 2A battery charger/maintainer

Bought this chinese 12V 2A car/motorcycle battery charger/maintainer $7. It looked OK hardware wise in pics.
But... everything runs quite hot at 2A - IC, transformer, capacitors, output rectifier....
Forum: General Capacitor Questions & Issues 11-30-2019, 06:01 AM
Replies: 34
Views: 489
Posted By redwire
Re: Tumble Dryer start capacitor

Redo the ohmmeter test. With three motor wires, there should be continuity between any two wires. No open circuit.
Forum: General Capacitor Questions & Issues 11-29-2019, 08:05 PM
Replies: 34
Views: 489
Posted By redwire
Re: Tumble Dryer start capacitor

I read it in a service manual for another Hotpoint Aquarius tumble dryer AQC851. It has an "anti-allergy program" that uses two directions, so the drum must have strange tines. The motor has the same...
Showing results 1 to 25 of 500

 
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