voltage between metal chassis and ground diyaudio Touch the metal chassis and it hums. Check the voltage between the chassis and earth ground and it is about 50 V AC, which seems a bit high to me. Checked another one of my amps and the chassis to ground voltage was 7 V AC. Our Fabrication Division thrives on variety. One day we are building large hoppers for a bottling plant, and the next we are manufacturing delicate medical devices. All of these experiences make us especially qualified to meet your contract manufacturing needs.
0 · Voltage between chassis ground and earth ground
1 · Question on Chassis Ground
2 · High AC Voltage Between Grounds
3 · Grounding and Shielding for your DIY Audio Projects
4 · DIY Audio Projects Forum • Grounding Techniques
5 · Best Practices for Grounding Aluminum or steel chassis
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Voltage between chassis ground and earth ground
Touch the metal chassis and it hums. Check the voltage between the chassis and earth ground and it is about 50 V AC, which seems a bit high to me. Checked another one of my amps and the chassis to ground voltage was 7 V AC. That is dangerous, there should be a connection between the audio ground and the metal chassis. However, the connection could be a low value resistor and/or a diode bridge.
Question on Chassis Ground
If I take an Ohm meter and measure AC between let's say one of the RCA connectors (ground) and the chassis, I get anywhere from 25VAC (amplifiers) to 50 VAC (preamps). DC between the two grounds is practically zero. The systems work perfectly. .
1) How can I ensure that my connection between the ground terminal and the chassis is robust? I've seen a few examples of folks who use a star washer between the terminal and the chassis, followed by the terminal, and then a star washer on top of the terminal, .
The first is obvious, the signal ground, the second is the power supply ground and third and often ignored is the case or chassis ground. Each has a particular function and all interact. The signal ground's usual and primary function is to provide a return path for the audio.
If the mains power ground is compromised in any way, and/or a better ground is nearby, if the chassis is above ground for any reason, a shock potential remains. Here is only one scenario: Your mains ground is 30 developed meters (100') from the panel.
What would be the best way to connect ground between those two PCBs please? One connector for signal and ground and the other one with +15V and -15V, or one with just signal and the other with +15V, GND, and -15V? . I would also measure voltage present, if any, between that power supply connector (any pin) and a real confirmed ground. Be careful, a multimeter probe may slip and short it. Also measure voltage (if any) between every chassis and a confirmed Ground. Asd you see, we are testing all possible combinations 😱
I have built a tube amplifier ( 6n1p + kt88 se), power supply is with bridge recrifier using Si diodes. I measure 0V dc and 50V ac between chassis and ground. The green/yellow wire from the mains is bolted to the metal chassis. Question is: should I .
High AC Voltage Between Grounds
Ground loops will be practically inevitable, but their currents will only flow through shields and metal boxes and not through the PCBs, and since the connections between the different pieces of equipment are balanced, they are not very sensitive to voltage drop across the shields of the wires. Shipboard has all kinds of very excellent "Ground" metal return points in/on the ship. There was more access to 110-120VAC equipment. There was less respect for that equipment and voltage. The Radars, High Power Sonars, High Power Transmitters, etc. were maintained by persons that were carefully taught safety rules. Yesterday I did the same thing on an 70's ADC Soundshaper MKII (Metal chassis & aluminum front). What I did was connecting a ground wire to the chassis and another wire to the PSU ground between the capacitors. It's working fine with my Pioneer grounded stereo. UL specifies a minimum of a 4 mm spacing across a surface (PCB) between any "energized" part up to 400 V Peak and a part of opposite polarity or a "dead metal part" (earth). UL then specifies a 8 mm spacing for any voltage up to, I believe 1000 V peak.
The 5V centertap on the 372JX should not be grounded - it is directly connected to the cathode in your rectifier, connecting it is a dead short right across. Safety ground to chassis right where the power cord enters the PSU chassis. 0V 'signal ground' connects to 0V signal ground of audio chassis. - Audio circuit in second chassis, with voltage regulators and/or subsequent decoupling RCs in that second chassis, close to their loads. 0V signal ground connected to chassis at audio input connector(s). . Make it a 10 Ohm 2W resistor for all the reasons mentioned. Metal casing of DIY gear ALWAYS directly to PE. Audio GND to same point with a 10 Ohm. No ground loop and when L would short to Audio GND the breaker/fuse still will protect humans. The anglosaxon system with PE directly to Audio GND in all devices (when one has repaired British audio. many have .
Hello to All! My DAC has 3 very small value (.047uf or less) ceramic caps between the circuit GND and the third wire ground (connected through the metal chassis). Would I be able to further reduce ground plane noise if I added another similar value ceramic cap between GND near major digital processing chips and the third wire earth ground connection? .
This would imply two star ground returns for the power supply common; one on the power supply chassis, and the other on the amplifier chassis. This would of course create two separate grounds, with a potential difference between .
I'm currently finishing one of Peter Daniel's PCB LM3875 chipamps and I'm stumped on the chassis ground/star ground concept. Is the star ground a collection of the chassis ground, signal ground and earth ground all connected at one common point? My chassis is made of wood so I don't really. Hi all, Sorry if this is a silly question but i want to connect some linear voltage regulators after the rectifier board shown below. If i connect them to the V+ and V- it works fine, however the DC output isnt referenced to ground. I then tried connecting the GND to chassis ground and powered. My questions: What kind of cable would be wise to use between power supply and amp, and should the separation between chassis ground and signal ground happen in the power supply or in the amp. Would an xlr4-cable work for this (chassis ground, signal ground, plus and minus)? If the ground separation happens in the amp, a normal xlr would be enough. I've just DIY a GG pre-amp, and burnt my power amp and speakers. I found that there is a 0.1V AC all over the chassis. I've check everything in the GG but still couldn't find the cause of the AC. In the GG, I use star grounding: all components' ground connect to a .
Admittedly the whole chain of events is low probability, but let's say the little ground resistor gets blown open. I've seen that happen. Now, let's say some supply flaw puts line voltage on the circuit ground. Even though the chassis is grounded, you now have line voltage accessible by the user. I.e., the shielding has been breached. Hi, First of all, this is my first post here. I am fairly new in amp building. The LM3875 from Peter (audiosector.com) will be my first project. As.
If the component's signal reference ground is connected to the equipment chassis, which is subsequently connected to the safety ground, then any voltage appearing between the safety ground pins on the power cords of those two components will result in interchassis currents which flow through the grounds of the interconnects. all depends if the transformer of your amp is well insulated between primary and secondary meeting the double insulation standard. then no ground connection needed. this is mostly the case for consumer Japanese amps (kenwood yamaha, pioneer, jvc, sono etc) they have a metal case, the transformer is bolted to the case and the mains cable has no ground . Featured Vendors The diyAudio Store Parts Connexion miniDSP . the heater wires, 165 ohms in both the 220 and 240V wires). Likewise, when powered on, I notice that there is negative voltage between the circuit and the ground (-1.3V). . could it be that originally the metal chassis was used to distribute ground and now a ground connection is . The Amp has 0mV between Input Sleeve and PE, so it's fine. The PC has 0mV between its chassis and PE, it's fine. The audio interface puts a 50mV on the RCA sleeve in relation to PE, so this is clearly the noise source. The only thing that connects the audio interface to the PC is a 3 foot firewire cable, in which I measure 50mV between ground .
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For the voltage and ground issue, I am planning to use this step down transformer, which has 2 outlets for 100V, in 1600 Watts, which should be more than enough even with the 300Bs in place. But, I am a bit confused with the ground issue.
(Most of ) the wiring is some stiff teflon insulated stuff that I got at a hamfest. The other parts are cheap generic AliExpress stuff. The metal frames / socket parts are daisy chain grounded to the safety ground for (some) shock protection. The chassis is surprisingly rigid, much more so than most of the inexpensive aluminum chassis. To avoid a ground loop, there should be only one such connection. I have found that the input connector is the best place for that connection if a metal chassis is used. The wiring from the board to the input connector (including the volume control if used) makes the circuit ground connection to the chassis.
The input RCA's should of course be isolated from the chassis, and the screen continued to the circuit board input entry. There should normally not be a connection between that input ground and any heavy current points. For reference, you can connect the screen of one input only to the star ground or the chassis through a small (1-10) ohms .
Grounding and Shielding for your DIY Audio Projects
Thanks Ben, your linked paper said: "The signal return is bonded to the chassis through a single connection from the power supply 0V to the metal chassis" Rob from DHTRob does attached pic and I read for example Elliot Sound that shares the same chassis point signal GND & signal GND trought a SLB attached pic so still confused what's the proper way.
DIY Audio Projects Forum • Grounding Techniques
Best Practices for Grounding Aluminum or steel chassis
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voltage between metal chassis and ground diyaudio|DIY Audio Projects Forum • Grounding Techniques