/r/AskElectronics

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A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools.

A subreddit for practical questions about component-level electronic circuits: design, repair, component buying, test gear and tools.

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/r/AskElectronics

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1

Switch mode PSU shuts down when two devices are connected but is fine with one. The PSU is overrated (5A for a 3A and a 1.5A PSU replacement) and I doubt they were running at full load. Both devices are connected via HDMI so possibly sharing a common ground.

I have tried disconnecting the hdmi cable and this makes no difference. I've measured the current when running separately and have 0.3A + 0.35A so it's definitely not overloaded. For some reason they don't like being powered off the same supply. Anyone have any ideas or solutions please? Keen to save space hence the combined power attempt.

1 Comment
2024/07/19
22:02 UTC

1

Dewalt pcb

I’ve been repairing this dewalt first fix framing nailer which I bought faulty with the aim to repair it.

So far it’s gone from dead to now spinning up and firing but only on one of the speed settings. Putting it into the 2nd speed setting sends it back into thinking it has a jammed error and then even switching back to the first speed keeps it in a jam error until removing the battery. This leads me to believe the fault has to be either at the small pcb where the switch selection is or on the main board (higher suspicion of this as the small switch pcb board looks immaculate)

The previous owner oiled the gun which is less than ideal for a friction based oillless gun and I’m wondering if some of this has found its way into the board.

However, the main board is covered in a white rubber silicon like material so I can’t actually inspect it / replace any of the suspicious looking capacitors. Any advice on how to get to the board or is it not possible?

Thanks in advance

1 Comment
2024/07/19
21:46 UTC

1

Sound Card Electrical Specifications.

Hello,

I'm currently working on a project and realized that I can use my laptop Sound Card for sampling signals.
However, I don't find what the maximum signal ratings are. (Voltage most importantly)

This is my laptop's sound card.

https://preview.redd.it/nfdwulwamjdd1.png?width=680&format=png&auto=webp&s=4703a115b3580dea4fb5e5e0156920c7ba1b3d73

How can I know the electrical specifications? I don't want to ruin my sound card XD

1 Comment
2024/07/19
21:27 UTC

0

Doubt flash memory retention

The type of flash memory on this PCB can store data for how many years? Is it possible to extend this retention?

https://preview.redd.it/uz2a5topuidd1.jpg?width=3264&format=pjpg&auto=webp&s=8c87776c3d954156a56fdcc34c65e648fdaee9ac

3 Comments
2024/07/19
18:50 UTC

0

I am attempting to identify and source this capacitor. Any help is appreciated.

I have possibly one on e-bay, being sold by "aftermarket.supply". Has anyone had any experience dealing with them? They don't provide any pictures of the product on the listing.

5 Comments
2024/07/19
18:31 UTC

2

Potentiometer question

Hi there,

I have this machine in which the potentiometer failed since I have another one that uses the same exact one. It's quite complicated to pull it out as it is without risk. My question is where can I find one like this with a "206" code. Most of the kits in amazon have 203, 205, but I am not sure where to find this one. Educate me out of my ignorance if possible to find a replacement.

9 Comments
2024/07/19
17:56 UTC

1

what is this component?

is it a 82pF capacitor? i’m not sure where to find the part #

2 Comments
2024/07/19
17:35 UTC

1

Does a version of this exist but the pin header is male?

2 Comments
2024/07/19
17:08 UTC

2

USB PD 3.1 Sink Controller? (SMD)

I've been trying to find out a Sink Controller for the USB PD3.1. There are some promising controller such as HUSB238A for supporting 240W but it's out-of-stock (or rather maybe not released yet?). So I guess I can forget finding 240W for now?

I've been also searching for more-common 140W standards as well, but even that I couldn't find Sink Controller for it. It feels like those doesn't exists at all (LCSC, JLCPCB etc.) but there are already companies like Apple, Framework etc. supporting up to 140W/240W.

So far my best option I could find is up to 100W with HUSB237 - but can anyone help me to find a sink controller of which I could push the 100W limit?

6 Comments
2024/07/19
16:50 UTC

3

Help me identify this component on this old TV (to repair it)

Hello there,

this cathodic TV just burnt on me while it was just idling and not in use. Popping noise and slow cleepy smoke coming out of it.

The TV is a : Thompson 14MG10F Type 418/TX807 EU

Im not sure what this component is, and would like to replace it if that is possible. Do you think i can desolder it and solder a new one in place without encountering issues? (i already done so with other components but i knew what they were before attempting anything)

I have added some closeup pictures if that helps.
I tried those numbers printed on it in google but no results.

Thanks in advance for your help!

https://preview.redd.it/rm6aimm98idd1.jpg?width=2136&format=pjpg&auto=webp&s=83cf0a5688125abb3ce575ff66770a34e0db14e4

https://preview.redd.it/iwqu9wyd8idd1.jpg?width=2136&format=pjpg&auto=webp&s=11d2f2e0669529a0640cada5942df2c128da13e7

https://preview.redd.it/ofxv3bzd8idd1.jpg?width=4624&format=pjpg&auto=webp&s=67f57ecd739d57efec28d696097289134d194f5e

https://preview.redd.it/7zemeuyd8idd1.jpg?width=4624&format=pjpg&auto=webp&s=df44702e22fed41eb2b2ef911632412b6d886853

https://preview.redd.it/72to7tzd8idd1.jpg?width=4624&format=pjpg&auto=webp&s=641e1098bfd8b0694a4665fb8e9385640e4bd884

5 Comments
2024/07/19
16:44 UTC

1

Analog Input Protection

Hi,

I am designing a data acquisition system. In the analog frontend I need to have common mode volatge range of 1000V.It should support 1000 V peak with respect to earth ground.what is the best way to provide this?

Thanks in advance

1 Comment
2024/07/19
13:52 UTC

1

(in a RELAY) Does this diode matter?

Hey all... I'm looking to replace a couple of relays in a diesel generator starting circuit.

They're both the same - one does the job of switching on the priming pump for a certain time period, the other engages the starter motor.

I've found what looks like the exact replacement, except for one thing: the diode shown in red is present on the circuit diagram of my original relays, but is not present on the replacements I've found:

https://preview.redd.it/20l6g0x0zhdd1.png?width=163&format=png&auto=webp&s=2af9ca3c3b97539df2c89fe43ad16c13ed11632a

Will this be a problem?

4 Comments
2024/07/19
15:53 UTC

1

What Component is this?

I'm back with another component question. What is this chip. Finding it's model and the people who made it online has proven to be difficult. My guess is it's some sort of application specific part, but I haven't yet worked out all the connections coming in and out it yet. One of it's pins connects back to a analog multiplexer on the board so I thought it might be an output but I was wondering if someone else might know what this is. If not, I'll just label it as a black box and move on. Thank you in advance.

4 Comments
2024/07/19
16:17 UTC

11 Comments
2024/07/19
16:17 UTC

1

gopro modifications for pov filming in a dental envierment.

Hello, everyone. I want a GoPro to film pov videos of my dental work.

I would like to separate the sensor module and add a costume lens to it, but I could not find anything on the subject. Some modes are available for the GoPro 5, but it is an older model.
https://stuntcams.com/back-bone-ribcage-ripcord-2-gopro-hero5-ribbon-cable-camera.html
I have found the Ripcord 2 mod, and this is basically it. there is a cable here
https://www.redkytedrones.com/products/gopro-sensor-ribbon

But it is not available to buy and there is no enclosure for the sensor module
can anyone point me to a place where I can learn how to do it? or has any data on the subject.

1 Comment
2024/07/19
15:55 UTC

0

Plug terminal mirror version needed.

I nee the round part to be on the other side

o, I have a product that was sitting in the drawer for a few years and I "lost" the connectors. The problem is that one row of connectors is oriented up, the other is down, and the small circular part of the connector is on the inside.

This one is JILN JL2EDGK-50803G01 on lcsc, tried other stores (digikey, mouser) but couldn't find what I need. So, I have a product that was sitting in the drawer for a few years and I "lost" the connectors. The problem is that one row of connectors is oriented up, the other is down, and the small circular part of the connector is on the inside.This one is JILN JL2EDGK-50803G01 on lcsc, tried other stores (digikey, mouser) but couldn't find what I need.

Pitch 5.08 mm, 3 pin.

I nee the round part to be on the top side

I cannot just rotate the plug 180 degrees because there is no space behind it, and the taller version is too tall.

1 Comment
2024/07/19
15:04 UTC

1

What should be considered when connecting power mosets in parallel, especially in H-bridge?

Title.

9 Comments
2024/07/19
13:52 UTC

1

Alternative connector housings for Dupont crimps

Hello Everyone

I was wondering if there is a connector housing that can't be plugged in backwards that uses Dupont crimp pins? I have a cheap crimping tool and I've become proficient at using it to make Dupont cables, however I want a plug and socket combination that has a polarity. I would use some kind of JST connector but I can't get reliable results crimping them with my tool and I can't afford a more expensive crimper at the moment.

I don't know if there are even other kinds of plugs that use the same crimp pins or ones that are very similar, but it seems entirely possible, but I'm overwhelmed by the choice and I just want something that works like a Dupont connector but can't be plugged in backwards.

Thank you everyone

2 Comments
2024/07/19
12:44 UTC

1

Help identifying chip, and general guidance

Hi everyone,

Before I begin, I'll preface this post by saying that I'm fairly/almost complerely new to electronics of this degree (I'm a recent graduate in computer science, so unfortunately more experience in the 'softer side' of wares). I do have a basic grip on some electronics concepts and how on board memory will likely work.

I'm trying to reverse engineer a kids pop toy that has a few modes - score, pattern, etc. My goal is to read the programmed memory, and replace the announcement voice.

I've included pictures of the board. I'm assuming that all program memory is stored on the one large chip on the board (but as I said before, I could absolutely be wrong).

Does anyone recognize the chip labeled ENE411E or know anyway I could go about identifying it? Ive googled the label but have had no sucess finding any info on it.

Thank you for your help and patience!

https://preview.redd.it/x2jjzmvgdfdd1.jpg?width=1080&format=pjpg&auto=webp&s=e8f33f058f0e7e634f8aa11cfc384e8f59b173f4

https://preview.redd.it/9f9lhkvgdfdd1.jpg?width=3024&format=pjpg&auto=webp&s=721fad055973731cdc347efe5e82aa74081f79fc

0 Comments
2024/07/19
07:08 UTC

1

How do I connect these two MOSFETs as shown in the schematic below?

1 Comment
2024/07/19
08:27 UTC

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