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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59 views

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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2answers
101 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 ...
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1answer
66 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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2answers
26 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 ...
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1answer
219 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 ...
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2answers
65 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. ...
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3answers
39 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 ...
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47 views

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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1answer
546 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 ...
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1answer
26 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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1answer
437 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 ...
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2answers
85 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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75 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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3answers
589 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 ...
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2answers
141 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 ...
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1answer
141 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 ...
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1answer
114 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 ...
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3answers
475 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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4answers
1k 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 ...
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2answers
138 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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1answer
128 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 ...
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1answer
1k 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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2answers
8k 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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518 views

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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2answers
3k 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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2answers
2k views

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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1answer
544 views

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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1answer
379 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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1answer
240 views

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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2answers
115 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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1answer
139 views

How do I learn to design a 50Ω coaxial interconnection/interface? [closed]

I've designed an electronic load for testing power supplies (circuit and photo in this post: Designing a *linear* MOSFET driver stage). The load can be controlled (programmed) using an arbitrary ...
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3answers
3k views

How to choose the impedance of a BNC adapter?

I am trying to set up lab equipment to measure my soon-to-come sample, but I couldn't get my mind around one thing, impedance termination. I will tell you what I have, what I want to get, and my ...
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1answer
603 views

Why is there such a huge price range for BNC terminators? [closed]

I wanted to buy some standard BNC 50 Ohm terminators and was surprised when I saw multiple offers with prices well above 20€ per piece. I found others for around 2€ (same online shop) and now I am ...
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2k views

What type of Connector is this?

The connector on the left is a standard BNC, but could someone please tell me what the connector on the right is?
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1k views

Designing a test instrument to be connected to an oscilloscope

I'm working on a piece of test equipment that is intended to be hooked up to an oscilloscope to measure the waveforms it produces. Since that's its reason for being, I figured it made sense to provide ...
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2answers
750 views

Multiplexing signals of two wires of a BNC cable and transmitting over a single wire

Background: I have a normal CCTV camera (650 TVL) . It requires a BNC cable in order to feed video signal from camera to DVR. Problem The problem is I have only a single copper wire from CCTV to DVR. ...
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1answer
2k views

BNC cable instead of oscilloscope probe for fixed setup?

I'm developing a device, it will generate a signal that will be fed directly to an oscilloscope, and connected permanently. I now have the circuitry set up on a breadboard, attached to the scope ...
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3answers
4k views

BNC splitter which separates ground and signal?

I'm a student doing research in a physics lab and we often have the need for a certain type of BNC cable splitter. This splitter has a BNC jack which accepts a single coaxial cable as input. It has ...
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2answers
1k views

How do I properly clean oscilloscope BNC connectors?

Over time with use BNC connectors on test equipment will attract contaminants . Since BNC is usually used for relatively high frequencies, I suspect that contaminants will have negatively affect ...
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2answers
4k views

Are there any differences between clamp, twist-on, and crimp coax connectors outside of cost and ease of assembly?

I have recently started working with software-defined radio, and have replaced some connectors on RG-58 coax in preference to using multiple adapters. RG-58 BNC connectors seem to come in three ...