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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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 ...
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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 ...
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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 ...
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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 ...
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13 votes
4 answers
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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/...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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?
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1 answer
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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 ...
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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 ...
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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 ...
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6 votes
3 answers
1k 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 ...
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160 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 ...
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2 answers
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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191 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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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1 vote
1 answer
38 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 ...
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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 ...
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2 answers
226 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 ...
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144 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 ...
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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 ...
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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 ...
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2 votes
1 answer
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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 ...
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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 ...
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1 vote
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 ...
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4 answers
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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 ...
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1 vote
2 answers
326 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 ...
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2 votes
1 answer
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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 ...
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1 vote
1 answer
2k views

BNC connector schema pins

I am making a PCB using Eagle which features a few BNC connectors. Eagle comes with the RADIALL R141426161 component so I'll just use these instead of searching for other ones. The component has the ...
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0 votes
2 answers
12k views

DIY BNC to F-connector or RCA? [closed]

I've searched for this until I'm starting to get sick. I decided to just ask for help. My friend has a CCTV camera with the typical BNC/Power cable, but he doesn't have a DVR. I have zero interest ...
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interface two wire pH sensor with arduino

I have purchased this pH/EC sensor from https://www.cooking-hacks.com/ph-sensor however it does not have a BNC connector and just two wires, black and read. How could i interface this to an Arduino? ...
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4k views

Convert BNC to Ethernet to Coax/HDMI

I need to make a cable run of approximately 150 feet. The source is a security camera box and the destination is a large ~42" television with all the basic hookups. The source box is in a room right ...
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BNC cable's characteristic impedance and voltage drop

As far as I understand, the characteristic impedance matters when a signal is oscillating since the BNC coaxial cable can be modeled as having inductors and capacitors as in the figure: I have couple ...
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1 answer
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Photomultiplier BNC cable impedance matching

I'm not sure how to connect the 50 ohm resistors to match the BNC cable's 50 ohm impedance. I draw something but it could be different.
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1 vote
1 answer
762 views

Balanced BNC cables?

I'm working in an experiment with high voltages and unfortunately a high voltage AC source is affecting the signal in my BNC coaxial cable (which is going into an oscilloscope or some other measuring ...
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Decoding coax signal

There is an old age board (doubt to be a PLC) which outputs keypad and touch panel data through a single BNC connector. I've managed to capture its output signal using oscope which is available in ...
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-2 votes
2 answers
147 views

Can I use a USB for four point impedance measurements

I'm not very familiar with USB's, but I do understand that usually there are four wires, a +5V, a GND, and D+ and D- for data exchange. What my question is, is that currently with a system that I'm ...
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