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Questions tagged [bnc]

A BNC (Bayonet Neill–Concelman) connector is a type of coaxial connector commonly used on test equipment and in other applications up to around 3-4 GHz and sometimes at higher frequencies. The most common impedance is 50 ohms but 75 ohm variants are also available.

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BNC panel connector nut position

I need to use this panel mount BNC for an enclosure. My problem is I cannot figure out if the washer will be on the flange side or the nut side. I cannot find any schematic or photo as well so I had ...
cm64's user avatar
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PCB Impedance mismatch?

I created a very simple PCB, two layers for testing a OXCO. The overall circuit is as follows: Now, so far so good from the testing point, I got what I expected: A square wave signal with a maximum ...
Ken90's user avatar
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Characteristic impedance of a BNC jack to jack adapter

I have this BNC jack to jack adapter. I want to measure its impedance but I am reading around 1mΩ. The datasheet says that it is a 50Ω adapter. Why am I measuring such a low resistance?
Santi Ospina's user avatar
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Unexpected signal at AD620 module output when Vsupply is on

I bought an AD620 instrumentation amplifier module and below is the module schematic. Souurce - https://protosupplies.com/product/ad620-instrumentation-amplifier-module/ A problem shows up when I'm ...
Jack Huang's user avatar
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4 answers
152 views

Using a BNC shorting cap as a switch

Regarding this short-circuit BNC cap: Is there a way to know if the cap is isolated from the inner BNC pins where the current will pass through? I want to use this as a lock with a panel mounted BNC, ...
ty_1917's user avatar
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2 votes
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Looking for Low Noise High Shielding BNC [closed]

I am doing some research looking at low voltage signals, on the order of 100nV. Due to the usage of other equipment such as a current source there is spurious pickup noise in the cables carrying this ...
Cillorn's user avatar
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How do I properly route my signal to this BNC connector on my PCB?

I am looking to use several of these Amphenol BNC connectors on my PCB. When I look at the datasheet, my instinct tells me that I should route my signal to pin 1 and then ground the rest. Here is the ...
te4gan's user avatar
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11 votes
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Is there anything particularly special about a "short" and an "open" in a VNA calibration kit?

I would like to calibrate a VNA with the reference plane at the end of a male BNC feedline. Surprisingly, female SOL kits are hard to find. There are many BNC 50-ohm loads available but I'm having ...
KJ7LNW's user avatar
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Unclear pin connections for BNC connectors on PCB

I want to use the following BNC connector on the PCB I am designing: https://www.mouser.ca/ProductDetail/Amphenol-RF/031-5493-1010?qs=py4qCovljJ%2FMGk8N0v0eQw%3D%3D The component has 4-pins and the ...
ALUW's user avatar
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Terminating unused SDI/BNC input

I use the Magewell Eco Capture Quad SDI M.2 (a small form factor quad-channel) capture device which keeps overheating after a few minutes (up to 100 C). I've read that this might be due to cameras not ...
Random's user avatar
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Splitting CB Radio Mic Inputs?

I just purchased my first CB radio and I am looking to split the microphone's output such that it can go to two outputs (the radio itself and custom electronics I plan to design). I'm using the Uniden ...
jimBeaux27's user avatar
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What happens if the there is a mismatch in impedance between signal generator and BNC cable?

My signal generator has 600 ohms in its internal output impedance (Picoscope 3204B). The BNC cable at my hand is 50 ohms, so is there any problem with the impedance mismatch? If yes how can I ...
settimed's user avatar
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1 answer
170 views

Inline BNC voltage reducer? [closed]

I have absolutely zero knowledge on electrical engineering. I am currently using a lock-in amplifier and a pulsed light source (with reference-output), but the reference output signal is too big and ...
GeekyDude's user avatar
13 votes
4 answers
5k views

What is the purpose of oscilloscope-probe-to-BNC adapters?

What are these adapters used for? (Image off Google, source) They fit over the tip of a passive oscilloscope probe, like this: (Image excerpted from https://www.caltestelectronics.com/public/...
polwel's user avatar
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BNC Cables and their impedances

V1=10 V(peak to peak), frequency of voltage source = 1kHz, D1 is a standard 1N4007 Silicon Diode, R1=10 kilo ohm (the load resistor) In our electrical lab, we were given the circuit shown in the ...
panda4khz's user avatar
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Force to connect BNC

I recently bought protective BNC caps for my oscilloscope input. When I screw them on or off I need to apply a much greater force than when connecting the probes. Is this normal? Could this damage my ...
J Physics FM's user avatar
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How to understand the schematic symbol of this isolated, filtered BNC connector?

I found some isolated panel-mount BNC connectors which have an integrated capacitor for RF chassis-bonding, e.g. this molex part 73100-0090. The datasheet contains this simple schematic to illustrate ...
tobalt's user avatar
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Isolated BNC connector in metal chassis, EMC considerations

I consider using an isolated BNC connector for a precision application, in which the BNC Shell will be either grounded via an internal switch or used as a Guard electrode. The motivation behind this ...
tobalt's user avatar
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Problems with small signals through BNC connectors?

I have a 120kHz signal from a transducer with peak to peak values of typically 40mV being carried over coax cable and connected at both ends via BNC connectors. Most of the time this seems to work, ...
Dirk Bruere's user avatar
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How do dual output in waveform generators make sense

I'm a noob in electrics and getting very confused with experiments about the electrical instruments' grounding... I have a dual output waveform generator like this (ignore the 'sync' as I don't use ...
gudako's user avatar
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Where can I find the symbol of BNC in LTspice?

I am working with LTspice and I need to put a BNC at the input of my amplifier. Where can I find this symbol?
Chài Mà's user avatar
1 vote
1 answer
687 views

Low quality BNC cable problem

We have been having problems with pre-made BNC cables. The cause has been narrowed down to the fact that once the BNC is locked in place the cable can still rotate relative to the connector. This can ...
Dirk Bruere's user avatar
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Where does the Panel Mount BNC Connector make the ground connection to my PCB?

This may be a dumb question, but where does the PCB make a connection with the signal ground on this BNC connector? All I see is the signal pin that is soldered on (via solder cup) and no where is ...
wgthompson's user avatar
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Charge sensitive amplifier operation doubt: Same BNC for two purposes. How?

I opened a charge sensitive amplifier (CSA) board which is used in radiation detection. I am trying to figure out how it works. It is totally confusing me that one BNC is used for two signals. How ...
master_yoda's user avatar
6 votes
3 answers
2k views

Advice on BNC cables for beginners electronic lab

I'm setting up an electronics lab so I can increase my knowledge of electronics. I've bought some equipment of ebay ('scope, power supply, signal generator etc.,) but don't know what sort of BNC ...
Keith Miller's user avatar
1 vote
1 answer
628 views

BNC terminator at end of T junction

I'm planning to get an oscilloscope and a signal generator. It seems to connect the signal generator to the oscilloscope. And it seems a 50 ohms terminator is needed. I wonder if I can use a BNC T ...
Michel Keijzers's user avatar
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2 answers
296 views

BNC Connector/Cable Suggestion

I am not an expert in this area and therefore need suggestion regarding what is the best way out for this case. For my experiment, I am installing a camera that requires a BNC based trigger signal. In ...
Tanmay Agrawal's user avatar
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0 answers
354 views

Optical Isolation of BNC trigger?

I am wondering if there is a more practical way to provide optical isolation for a BNC trigger. I am currently using the following: https://www.eagleharbortech.com/product-categories/fiber-optic-...
MaxwellEE's user avatar
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How to substitute this pickle switch with a software controlled switch?

I'm working as a research assistant. We have three high frame rate cameras that currently save the recorded video when the pickle switch (purple cord) is manually pressed. I want to replace this ...
snowg's user avatar
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1 answer
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How do laboratory devices (from photo) work with BNC cables, connected to ground

The title is a bit cumbersome because my questions are a bit difficult to describe. Here is a photo from Practical Electronics for Inventors by Paul Scherz I'm curious on a few things: How does the ...
mikanim's user avatar
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2 answers
3k views

pH sensor box - ADS1115

I made a pH sensor box to monitoring my hydroponic culture. I built a PH sensor box (see Frtitzing) to use for my hydroponics system with: - Esp8266 - ADS1115 - BNC + pH probe (2X) Unfortunately the ...
Laurent's user avatar
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1 answer
874 views

Is there a way to terminate a two conductor cable to a BNC plug?

I have a device with a two conductor cable that I need to interface to a signal conditioner with a BNC input (same as that on a standard oscilloscope). I would rather not use a hacky solution like a ...
Darren Mc's user avatar
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2 answers
36 views

RF connector/ interconnect for Gate signals

I need connector as shown in pictures. I spent good couple of hours trying to find them on Farnell but the lingo for such connectors is little difficult for me. I read a lot too but couldn't find ...
Autobot's user avatar
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2 votes
1 answer
5k views

Why are there 3 conductors on a coaxial BNC connector and 4 conductors on a triaxial BNC connector?

From what I understand, a BNC connector and it's cable has an inner conductor to route the signal and an outer conductor(cylindrical) to provide a shield to inner conductor and to provide a return ...
Salman's user avatar
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0 votes
2 answers
214 views

Do I need to consider RF power splitters for signal <1kHz?

I need to tap a signal on a BNC cord to record it with a Labjack ADC. The signal is very low frequency, as the FFT shows. I was planning on using an RF power splitter to add a line to the Labjack. ...
Sam O's user avatar
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0 votes
3 answers
80 views

Looking for a dc 2pin connector with latch [closed]

I'm looking for a pair of connectors with following features. about 10V rating (no high voltage) 5A 2 pins latch which will prevent from accidential unplug panel mount I want to mount the socket on ...
bart266's user avatar
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1 vote
0 answers
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The bottom 'pin' of a edge mount HD-BNC connector

I find except edge mount SMA connectors, there are also HD-BNC edge connectors, such as this. The recommended PCB land doesn't show the bottom pad. For smaller SMA connectors, I usually solder the ...
diverger's user avatar
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2 votes
1 answer
2k views

How does this impedance matching circuit work? How to simulate it correctly in SPICE?

I have a schematic for a current sensing circuit using a dedicated TI differential amplifier part for current sensing applications. The schematic also includes an "impedance matching" part for ...
genericpurpleturtle's user avatar
1 vote
1 answer
97 views

Connectors on pH electrodes

I would like to know why pH electrodes are always with BNC type connectors (or DIN, S7, etc.), but never with "simple" wires. Can we put a BNC adapter to 2 wires and read the tensions with a ...
Clement's user avatar
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0 votes
1 answer
2k views

How to wire up a BNC Connector in Eagle

Good day! I am in the process of adding some right angle bnc female connectors onto my PCB but I have no idea how to decipher the schematic file and have no idea which pins connect with what. The BNC ...
Andrew Schroeder's user avatar
0 votes
2 answers
374 views

BNC Male to Cable Connector Proper Method

I've recently bought some cheap RG58/59/6 BNC male-to-cable connectors for DIY work. The connector qnd its guts look like this: I couldn't find a proper name for this connector type, even worse, I ...
Fatih Yazıcı's user avatar
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0 answers
247 views

STP cable with BNC connectors?

Is there a cable-connector type on earth which is twisted shielded and uses BNC connectors as terminals? My data logging instrument has differential inputs with many BNC connectors. If I use an ...
user1245's user avatar
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3 answers
2k views

Function Generator, BNC T and Termination

I have a question regarding best practices for function generator to circuit/scope connection. I recently had an issue chasing down excessive ringing on square wave signals coming from a function ...
User7251's user avatar
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0 votes
2 answers
443 views

Feeding multiple 50 ohm terminated outputs from a single 50 ohm source without signal degradation

I'm having an issue in which I have a trigger from an instrument meant to be sent to another instrument with a 50 ohm termination. I want to use that signal to distribute it to several outputs that ...
Orhym's user avatar
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2 votes
1 answer
334 views

Would it be ok if I try to measure an audio signal using a 15m BNC Cable?

I would need to use a 15 meters BNC Cable (RG58) in order to measure an audio signal that goes directly to a pair of earbuds. This means, the test point would be exactly before the balanced armature ...
the_moon's user avatar
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0 votes
1 answer
556 views

Function Generator - Signal without Neg or Gnd reference

I have a new PC based function generator (very cheap), and an old BK Precision function generator. The old BK Precision can output a signal without the ground or negative reference lead from the BNC ...
MaxHenry's user avatar
2 votes
3 answers
2k views

What's the right way to connect two exposed pins from a board to BNC?

For an ADC evaluation board like this one, where signals go in through exposed pins, I'd like to have the signals come from a BNC cable (or SMA). However, I'm concerned about noise. What's the right ...
The Quantum Physicist's user avatar
0 votes
4 answers
6k views

Does a BNC splitter introduce defects into the signal?

I'm currently doing some contract work that includes finding and recommending a signal generator model for frequency measurement device verification. The verification scheme requires generating a ...
ivan_pozdeev's user avatar
1 vote
2 answers
458 views

Switching input BNC signal to two output BNC signals using BJTs?

simulate this circuit – Schematic created using CircuitLab Hi everyone, I recently completed the construction of a spectrometer that studies electron transfer events in inorganic molecules. I ...
James's user avatar
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2 votes
1 answer
206 views

High speed signals to FPGA

I want to take 30ns pulse signals from BNC cables and send them to pins on an FPGA board. I have the board in a metal box with ungrounded BNC connectors mounted on it. What's the best way to pass the ...
neutrino7934's user avatar