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Questions tagged [cases]

This tag is for questions about cases to put your electronics in. Note that shopping questions are off-topic.

0
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1answer
35 views

Worst Case Analysis of the LED circuit - Reg

I need to perform the Worst case analysis of the LED circuit attached. The value of the resistor has already been chosen and I am doing the calculations for min, typ and max current. Please bear with ...
0
votes
1answer
44 views

LED Package/Case

I could'not find the packaging searching online. Can you tell me the package/case types of the LED (right) and PD (left) below? Thanks in advance.
2
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0answers
35 views

Another ground question…plastic case with metal front panel, ethernet, connectors

I'm currently designing a board that will have: a primary power supply of 24VDC from an external converter a shielded Ethernet connector two BNC connectors (for two +/-10V signal, 14 bits, <100Hz) ...
1
vote
1answer
94 views

Advice for a 2.4 Ghz antenna placement

I have circuit demanding a 2.4Ghz antenna inside a metal enclosure. I cannot place it on the external casing since the case it's movable and will also be exposed to other issues. I need some advice ...
1
vote
2answers
142 views

What are these “X”s / crosses on this schematic's wiring? Traces attached to the metal housing (ground)?

Below is a section of the schematic for the RF modulator of a Nintendo NES-001 system. I am curious what these Xs are that I've boxed in red below. Looking at my own NES-001 and matching locations, I ...
1
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3answers
96 views

Unobtrusive panel mounting for controls

I'm in the middle of a "living room acceptable" project, and I'm looking to capture the spirit of a 1970s preamplifier (Quad 34, see below). My design has 6 LEDs, 4 push buttons, a latching mains ...
1
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3answers
93 views

Tamper resistant housing methods

When creating electronic devices there are times that we want to make it difficult for an unauthorized person to open the device. I was wondering where there might be a list of methods or common ...
1
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3answers
74 views

Is there any sense in carrying assembled enclosed electronics in a static-shielding bag?

Say I have a Raspberry Pi enclosed in a metal case, such as this: Would it offer any additional level protection if I put it in a static-shielding antistatic bag whenever I carry it around (e.g. ...
1
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3answers
387 views

Why is it important, in terms of ESD protection, to ground a PCB to its case (if not insulative)?

I have a 12V DC-powered SBC to mount inside a metal case. How important is it that I connect its ground(?) to the metal case on the interior? How is this going to protect against ESD events? From my ...
2
votes
3answers
932 views

Why is a caseless PC not an EMI problem?

As I understand it, the case of a PC is metal so that it can form an EMI enclosure around the electronic parts. My view is reinforced by there being conductive fingerstrips around the mating edges. ...
0
votes
1answer
88 views

Why Non-parallel but full case statement uses ROM not the MUX?

as far as I know, when the items in case are not parallel it would compose a priority routing network not the multiplexing network. In other words, it should uses multiple 2-to-1 MUXs to represent ...
0
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2answers
189 views

Fan not working on motherboard even if same voltage works with batteries [closed]

First of all I want to mention that I have no knowledge electrical field, so please forgive me if I will not be explicitly enough or I lack some terms, but I know no one with knowledge about ...
7
votes
1answer
551 views

What sealing type for cable/tube enter casing for outdoor use?

I build an electronic device which is used outdoors. A bundle of cables enter the device in a small 30mm diameter tube. This tube should be sealed so no dust/water/moisture enters the casing. It ...
3
votes
1answer
177 views

PSU metal case is live /

i have read quite a lot about this and i would like the experts opinion. I have an old dell desktop with a 250 watt PSU - PSU is grounded to the metal casing of the psu and the psu in turn touches the ...
0
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0answers
210 views

Electric current felt over the case occasionally!

We have made one vacuum former for dental medical usage. In testing, the operator reported: 1-Electric current felt over the case of the device occasionally! 2-hanging in some routines ...
-4
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3answers
742 views

ESD damage after touching metal PC case?

When i'm tribocharged and then discharge to a graphics card, i can kill that device. Let's say i'm at -2000V, compared to my motherboard, and i touch the metal traces around the board's screw holes. ...
2
votes
1answer
581 views

If a device has a metal case should it be grounded?

If a device such as this potentiometer has a metal case, should the case be grounded or left floating? Electrically the case is not connected. Data sheet
2
votes
1answer
2k views

Mounting a PCB with no holes [closed]

Apart from this edge mounting kit from Adafruit, what are some ways to mount a PCB that does not have mounting holes? I'm looking for non-permanent mounting solutions that take up little real-estate ...
2
votes
0answers
596 views

Conductive or insulated motherboard-standoffs?

AFAIK it's common practice to mount an ATX motherboard to conductive brass standoffs inside the case. There are even metal traces around the screw holes to provide contact between the screws and the ...
3
votes
1answer
307 views

Indicator LED to Case - mechanical design

I got a board for which I need several indicator LEDs and I cant decide on the best solution for the mechanical design of these. The board and the casing currently have a gap of 15mm to each other. ...
3
votes
1answer
428 views

Acrylic mounting and esd

I like the aesthetic of clear acrylic mounting of PCBs and I want to use it for a project I'm working on. For example as seen in the Mighty Ohm Geiger Counter, Is esd something I should worry about? ...
1
vote
1answer
134 views

Varistors set to ground or case by isolated ground/case

I have a isolated ground from the case in my device. The Supply Voltage is +24VDC with Ground and separated CASE, so no safety issues. On any signals coming from the case (Plugs) I put varistors, but ...
3
votes
1answer
4k views

Verilog and break statements is there a possible alternative?

So I am currently facing an issue where break; statements aren't allowed in verilog? Is there an alternative to this? I've tried disable block_to_disable, but that did not solve anything. Is there ...
0
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1answer
47 views

Mounting battery terminal contacts in an aluminium case

I'm trying to mount AA terminal contacts in an anodised aluminium case. Given that the aluminium is anodised, does that mean it's not conductive and the contacts could directly make contact with it? ...
2
votes
0answers
155 views

Should I connect stepper motor case to mains earth or power supply V-

I have a stepper motor driver, the sockets have the expected V+,V-, etc. However there is a bolt with a grounding symbol on the outside, I think this connects to mains earth? The third pin on a plug? ...
3
votes
1answer
882 views

Building a wall-wart style case

I'm working on a project that will plug directly into the wall outlet, similar to a night-light or a wall-wart power supply. Internally, I'll use a AC-DC converter like this one. It has built-in ...
1
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5answers
554 views

How do metal cases work with connectors & isolation?

I have troubles understanding how do metal cases behave in some cases. Case 1: I made passive attenuation box for amplifier(basically L-pad resistor), simple configuration: Amplifier => attenuation ...
1
vote
1answer
127 views

What do you use to connect simple battery holders?

I'm sorry for this very rudimentary question, I'm completely new to this hobby. I need to have a ~30V power source and I want to buy 22 AA batteries and connect them in a series. I intend to use ...
5
votes
4answers
535 views

What are the square holes for in most electronic project boxes?

I'm new to the electronic scene and lately I been purchasing a lot of project boxes for the stuff I make, I've noticed in about 75% of the boxes I purchase they come with small square shaped holes on ...
5
votes
3answers
2k views

Creating printed circuit boards (PCBs) which aren't flat

I would like to create a printed circuit board (PCB) which is not flat and which is not shaped into a square, but don't know how to proceed. Can Cadsoft Eagle create such a board? If so, how? What ...
0
votes
1answer
292 views

Can convection draw cold air INTO a PC case?

So imagine I'm mounting my nettop-style PC behind my monitor. Its CPU is passively cooled via heatsink. Now the side facing up should have vents so the warm air can escape the case but shoud the side ...
33
votes
4answers
31k views

Make a custom plastic case

I have worked on many electronic DIY projects like MIDIbox (http://www.ucapps.de/), it always was fun and working but at the end, the problem was that I ended with a cool gear, but in a poor casing, ...
1
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3answers
234 views

Enclosing/casing electronics

I have two issues about enclosing/casing electronics: I have some leads connecting each other with a few resistors in between. I have put the resistors and wire connections on a small piece of ...
-2
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2answers
317 views

cylindrical pcb design and casing

I'm trying to desing a control system that measures some analog signals like differantial pressure, temperature, motor current etc... and then produces some control signals and sends information to PC....
2
votes
4answers
479 views

Affix LED to a case

I found a topic related to my problem but I want to consider other options. (What type of glue do I use on an LED?) I want to attach LEDs and connectors on the front panel of a box (aluminum). The ...
3
votes
1answer
235 views

Small (max 5x5 mm) connector, panel mount, for asyncronous serial interface?

I opened a small router and hooked up 2 wires on the PCB (to catch the serial data). That works fine. Now I'm looking for a way to make a small (tiny) connector in the enclosure, so for future use i ...
3
votes
1answer
155 views

Are stand-offs unnecessary when the case is made of plastic?

If a case is plastic, would there be any real benefit to using stand-offs to ensure the circuit board is not in contact with the side of the plastic case? Even when the plastic is non-conductive? (...
9
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4answers
1k views

State of the art of waterproofing

There is a new electronics waterproofing material / technique branded as Liquipel. Not much info is available, but supposedly it is a hydrophobic compound that is applied to the target electronic ...
4
votes
2answers
4k views

EMI/RFI emissions and computer cases

I have designed a computer case (enclosure) for mini-itx motherboards. Its bottom and rear are made out of 2mm thick aluminium and the sides and top out of 4mm plastic (ABS). I'd like some advice ...
0
votes
2answers
1k views

Computer case causing interference with TV

I've recently changed my computer case to a new, bigger case. However, after I changed this case over, I can no longer watch TV due to interference with the signal. I have removed every output to my ...
25
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7answers
7k views

How do I open a rectangular hole on a metal case?

I'm working on a case design. There is rectangular switch. I am trying to open a rectangular hole on the metallic case to fix it in there. I'm not doing a good job, if it goes on like this it looks ...
4
votes
2answers
227 views

Should I ground my case

I built up a LM317 power supply which is working great. I have moved it into a large case as I am now powering it off 240VAC (fused) down to 18VAC then rectified into the power supply. Which is going ...
1
vote
3answers
3k views

If a battery case falls apart is it safe to just glue it back together?

I've got a battery with two Li-Ion cells inside that has a two-parts rectangular case and those parts were somehow tightly connected (I guess glued together) but then fell apart and now the cells and ...
4
votes
2answers
2k views

Where might I find a prefabricated enclosure for a PCB?

I'm working on a small electronics project that includes a micro-controller and a few extra items soldered down to a PCB. This project will need to be contained in a nice chassis/enclosure that can be ...
6
votes
2answers
1k views

Building a power supply for a Vic 20

I recently acquired an early model Vic 20 computer but don't have a power supply for it and thought I might be able to make one. The Vic 20 is the early model with the two pin AC connector - not the ...
10
votes
4answers
13k views

Best way to cut mounting squares out of plastic project boxes?

My electronic kit-building to date has included pre-drilled kit boxes for mounting. My latest purchase, however, has a plastic project box, and no pre-made cutouts. I need a rectangular hole for a ...
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votes
1answer
206 views

What's the best tool to design casings/boxes?

I often tend to build a prototype for a project and if I have something that's good enough I find a case that matches the prototype I've built. However, now I'm trying to do more of the design up ...
4
votes
1answer
3k views

How to affix graphic LCD to PCB?

I'd like to mount a small (2.5") graphic LCD or OLED display on a PCB. I believe it should look something like this: I've seen this done (links to pics) on my LM3S6965 development kit, on my TI ...
8
votes
1answer
550 views

What are good materials and associated tools for a robotics hacker?

What is good stuff to quickly build small hobby robots? What sorts of tools do I need to work with those materials? Let's assume we already have the electronics parts listed at "What is a general set ...
3
votes
1answer
2k views

Mounting a PCB in an Extruded Aluminum case

I want to make a case for a PCB using extruded aluminum. (Such as the IPOD nano shown below, and the portable amp under it). How do I mount the PCB inside the alumimum extrusion? (I know some come ...