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Questions tagged [chassis]

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0
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2answers
67 views

DMX chassis(?) pin?

I want to recreate this circuit (only show a small relevant portion): And my XLR plug for input (K2) looks like this: I found a reference how to connect K2, +, - and GND to the correct pins of the ...
6
votes
3answers
459 views

RS 485 ground signal and chassis

I have a shielded twisted pair running from one device polling several devices in an RS 485 loop. The conditions: The devices are in parallel as they should be. The termination resistors are in ...
0
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2answers
53 views

does the 24 Vdc supplied circuits with metal chassis needs to be grounded to earth?

I used put some electronic circuits together in a plastic box, with a DC power jack attached to the box for a 24V dc supply to my circuit. Everything works fine. However i now plan to put all the ...
0
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1answer
74 views

Chassis punches for IEC C13 sockets?

I can't believe I'm having trouble finding chassis punches for the IEC C13 socket. This has to be the most common way of getting 120VAC into a box, yet I can't find any chassis punches. How do most ...
2
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3answers
91 views

Using Chassis as a conductor for DC Power Supply Return

Is it considered a good practice to use the chassis as a return path to a DC Power Supply? I have been given a rack mounted device that switches 480 volt power on/off remotely. The remote feature is ...
0
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2answers
90 views

DC Power Jack - minus to chassis?

Is it OK to connect the minus from a DC Power supply, 15v 4A (switched) to a metal chassi as ground? No electronics will be connected to the chassi. The jacks that I have found seems to be made of ...
0
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1answer
63 views

SMPS output grounding (PE)

I am designing an ultralow noise 5V/3A SMPS. On the DC side, I see the ground (DC) is earthed (chassis ground) using a direct connection 0 ohm or using a Y capacitor. What are the differences between ...
0
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1answer
101 views

SMPS chassis ground and earth ground

I'm designing a ultra low noise smps and I have some questions about ground/earth chassis. The main goal is very low noise on DC output. Earth (PE) should be connected to one point (only) to the ...
1
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2answers
113 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 ...
0
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0answers
34 views

Dual transformer chassis ground

I need to wire a dual 20V secondary transformer for power supply. I'd use each of the secondaries for its own chain, with the usual rectifier bridge, filtering and 7809 output voltage conversion. ...
0
votes
2answers
479 views

circuit ground vs chassis ground

Can someone briefly explain what's the point of separating circuit ground from chassis ground with a capacitor + resistor?
0
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3answers
928 views

What could happen if a lightning strikes a car with a battery connected to the chassis ?

I was wondering today what could possibly happen if a lightning strikes my van where I have a 12V battery negative connected to the chassis. Could that destroy the battery or start a fire? In order ...
3
votes
1answer
341 views

ESD Protection on Un-grounded Chasis

I am designing a product solution which needs a 240V AC to 12V DC. I am getting that done with one of those standard laptop chargers from a reliable OEM(with necessary certifications) which looks like ...
1
vote
2answers
215 views

Chassis Grounding

I have a 5 V (rated 7 A), 24 V (rated 2.5 A) and 3.3 V (rated 1 A) power supplies in my project. I am planning to accommodate this PCB into a sheet metal casing. When I integrate this into the metal ...
0
votes
1answer
542 views

Chassis grounding short circuit

if the chassis of a DC power supply is earth grounded , and lets say I am messing around with my power supply and I touch the positive voltage perhaps through a jumper wire or a component on a ...
0
votes
1answer
119 views

If current flows through lowest resistance path, why circuits with grounding still work?

Okay, this may sound stupid. Current (conventionally) flows from the positive to the negative terminal of a source. This also means that the source's negative terminal is on lower potential than the ...
1
vote
1answer
354 views

Why not connect battery negative to chassis?

I am making a mobile robot with a metallic chassis. Usually, a non-moving appliance will have the ground pin of the wall socket connected to the chassis, but in a moving device, there is only the ...
1
vote
2answers
345 views

What are these kinds of pins called?

What are these connectors at the edge of the chassis called? I thought they were pogo pins, but it seems like they're not uniform and are keyed? How well do these kinds of connectors stand up to ...
0
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0answers
155 views

Method for mounting PCBs in a chassis without taking up board space

The device is two stacked PCBs that need to be mounted within a cylindrical metal enclosure. One end of the enclosure will be open while the other will have a metal cap with some bulkhead connectors ...
2
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4answers
2k views

Difference Between - (Minus Sign) and Chassis Ground in Schematics

I was working on building some projects from the book Electronic Projects for Musicians and I noticed that in most of the schematics there are two symbols for what seems to be ground. One is a - (...
0
votes
1answer
198 views

Extra 2 DB9 pins connection

Many DB9 symbols have 2 additional pins other than the 9 signal and GND pins that they are known for. How and to what are these 2 pins connected ? Pins 10 and 11. Is it connected to chassis ground or ...
0
votes
1answer
81 views

chassis ground and its location wrt common mode currents

This is related to chassis ground. The chassis ground is connected to the system ground at the entrance of the cable that brings in signals and not at the other extreme or opposite end of the PCB. ...
2
votes
1answer
3k views

Chassis ground on Ethernet RJ45 Connector

In the reference schematic of an Ethernet transceiver, I noticed that the chassis ground is connected to system GND by 1nF/2kV Capacktor(C24). What is the purpose of doing this? The connector(...
0
votes
1answer
208 views

Basic questions about chassis grounding

I am uncomfortable with the notion of chassis ground but I can't pin down what exactly bugs me. So I'll start with an example and ask a couple of questions on the way. My background is this: I have ...
11
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2answers
3k views

Why are some mounting holes connected to ground?

Why are plated mounting holes connected to ground ? I read that if you are connecting your board to chassis ground, then it should be connected at only one point and connecting say 4 mounting holes ...
2
votes
1answer
2k views

Grounding the chassis with capacitor

My question involves chassis grounding to earth ground. My PCB circuit is a simple signal generator using a microcontroller. It has a separate 'ground' from earth ground, supplied by a floating 5VDC ...
1
vote
1answer
1k views

Grounding in a DC circuit on a vehicle

I am working on a vehicle with batteries, but i am not quite sure if my grounding solution/design is correct. It is supplied with two 12VDC batteries in series, connected to a DC-DC (24VDC-24VDC) ...
10
votes
3answers
1k views

What do I do with the extra “ground chassis” tab on a DC power jack?

Product Link Datasheet I have about fifteen 9v wall warts within specs for the circuit; I'm going to use the one that fits the jack. There are three solder tabs on the jack. One for the positive tip,...
96
votes
6answers
39k views

Should chassis ground be attached to digital ground?

I'm working on a PCB that has shielded RJ45 (ethernet), RS232, and USB connectors, and is powered by a 12V AC/DC brick power adapter (I do the 5V and 3.3V step down on board). The entire design is ...
4
votes
2answers
2k views

Chassis + Ground Safety

Why is it safer for ground to be connected to the chassis for an electronic system? For example, the ground on the mains supply of an AC motor in a box fan is connected to the outer chassis of the ...