IR Repeaters?

Started by Jim Thompson in sci.electronics.design4 years ago 6 replies

Do any of these IR repeaters that use RF or Ethernet to control a source in another room actually work...

Do any of these IR repeaters that use RF or Ethernet to control a source in another room actually work well? Suggestions/recommendations? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | ...


wifi command set secrecy - why?

Started by Dimiter_Popoff in sci.electronics.design3 days ago 34 replies

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which...

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which is documented in a way we could write our own driver so our tcp/ip stack under dps would treat it as yet another medium, like it does with Ethernet or via PPP and sort of. What I don't get is *why* do they keep things so secret? When wifi was starting there was...


RJ45/8P8C alternatives

Started by Don Y in sci.electronics.design7 years ago 39 replies

Hi, I have an irregular-shaped (metal) enclosure to which an ethernet connection must be mated. I can afford to run at 10BaseT speeds --...

Hi, I have an irregular-shaped (metal) enclosure to which an ethernet connection must be mated. I can afford to run at 10BaseT speeds -- though would REALLY REALLY prefer 100BaseTX (-T2 is not a practical option). Connection must be weather-resistant (sheltered location; not "indoor"). The challenge is coming up with a suitable connection without requiring new castings. There are s...


a mysterious sensor

Started by Jan Panteltje in sci.electronics.design5 years ago 20 replies

Hi, been doing some sensor stuff. I connect those to a PIC micro and an POE ethernet module, and send UDP data that way. Today was the turn...

Hi, been doing some sensor stuff. I connect those to a PIC micro and an POE ethernet module, and send UDP data that way. Today was the turn for the relative humidity and temperature sensor DHP11. It is supposed to be within a few percent accuracy for RH. However with 60 % RH it displays 20 %.... I have 2 and both do the same, software is good and checksum of communication is good. S...


DIY PC Oscilloscope

Started by Anonymous in sci.electronics.design9 years ago 53 replies

Hi all, I've started designing a 200 MSPS Oscilloscope with a 25 MHz analog bandwidth, 3Ksample/channel buffer. The oscilloscope can be...

Hi all, I've started designing a 200 MSPS Oscilloscope with a 25 MHz analog bandwidth, 3Ksample/channel buffer. The oscilloscope can be connected to a PC via USB, and eventually via Ethernet and WiFi. The trigger is ( at moment) rising, falling... auto, normal. I would appreciate suggestions and or comment for possible improvement and functionality that could make this oscilloscope interes...


Networking Groups

Started by Anonymous in sci.electronics.design4 years ago 12 replies

I am using Google groups until my laptop situation settles down so I don't = have my lists of newsgroups. I can't seem to find a working group...

I am using Google groups until my laptop situation settles down so I don't = have my lists of newsgroups. I can't seem to find a working group for disc= ussing networking issues. Any suggestions? =20 I'm trying to get two PCs to talk over an Ethernet line, direct, no router.= I have them wired with fixed IP addresses and can ping one another. I ca= n view the hard drive of one from the...


About Audiophoolery At It's Finest !

Started by Anonymous in sci.electronics.design7 years ago 5 replies

...

http://hothardware.com/news/10000-ethernet-cable-claims-earth-shattering-advancement-in-audio-fi delity-if-youre-stupid-enough-to-buy-it Doesn't someone have to be dumb enough to buy that to support the place that sells it ? Damn, I guss that old ocmmon sense just does not apply anymore. Lessee, fovea is a macula, a... Fuck all that, it could go on all day.


PRBS in LT Spice

Started by John Larkin in sci.electronics.design9 years ago 25 replies

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent...

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent to transformer-couple the data, to avoid ground-loop common-mode hazards, and the obvious choice would be to use RJ45 connectors with built-in Ethernet magnetics. These seem to have inductance in the 400 uH range, which gives a low-end frequency response in t...


Measuring "payload" skew across network

Started by Don Y in sci.electronics.design1 year ago 17 replies

I have an application that distributes audio among multiple, distant nodes (emitters/speakers) over an ethernet. I control the relative timing...

I have an application that distributes audio among multiple, distant nodes (emitters/speakers) over an ethernet. I control the relative timing (phasing) of the signals from each emitter -- either in synchronism or leading/lagging by specific dynamic amounts (which can be on the order of many ms). To date, I've been measuring this skew in the time domain by emitting a plosive burst whose s...


200Mbps link between FPGAs

Started by Piotr Wyderski in sci.electronics.design2 years ago 73 replies

Hi, I need to reliably connect two FPGAs with a 200Mbps link. The chips will be separated by the distance of max. 2m, no isolation is...

Hi, I need to reliably connect two FPGAs with a 200Mbps link. The chips will be separated by the distance of max. 2m, no isolation is required, an ethernet FTP cable is available. The link should be bidirectional, but the communication needs to be fast in just one direction. Having two unidirectional links is a viable option. PHY layer simplicity is at a premium. I bet that many of you...


Help Picking Right Programming Tools

Started by ChesterW in sci.electronics.design7 years ago 16 replies

I need to pick a programming tool to plot some measurement data in real time. The data is transmitted from an instrument to a PC via Ethernet....

I need to pick a programming tool to plot some measurement data in real time. The data is transmitted from an instrument to a PC via Ethernet. Every second a new file is created on the PC HDD to store 1 second of data. The files are labeled data0, data1, etc.. Here's an example of some data: https://dl.dropboxusercontent.com/u/33776033/exdat/data0.txt and here's a quick look at a fe...


GBps to MB/s

Started by amdx in sci.electronics.design3 years ago 36 replies

To prevent spambots I need to answer this question to confirm registration to a forum. "If USB 3.1 Type-C Gen 2 speed is 10Gbps, What is the...

To prevent spambots I need to answer this question to confirm registration to a forum. "If USB 3.1 Type-C Gen 2 speed is 10Gbps, What is the speed of 10Gbps in MB/s (Answer must include MB/s):" I thought it would just be Gig to Meg or 1000, but I ge,t "that is an invalid answer", So I googled and found: " 10 Gigabit Ethernet speed 10 Gbit/s = 1250 Megabytes per second" But that als...


T568A/B timewaster

Started by Don Y in sci.electronics.design10 years ago 33 replies

Hi, I've deployed (wired) ethernet (CAT5, not 6) throughout the house. I chose to follow the "B" wiring color conventions in 8P8C's. But,...

Hi, I've deployed (wired) ethernet (CAT5, not 6) throughout the house. I chose to follow the "B" wiring color conventions in 8P8C's. But, from time to time, I end up adding or replacing an "RJ45" and always have to go through the effort of remembering which wiring scheme I originally chose. This is just plain annoying (useless timewaster!). What is "common practice" in this case? ...


Looking for a bit of help with power over ethernet

Started by Peter in sci.electronics.design2 years ago 10 replies

I've just started digging into POE for a client product. Never looked at it before... Let's say I am using the common Hanrun HR911105A which...

I've just started digging into POE for a client product. Never looked at it before... Let's say I am using the common Hanrun HR911105A which can be seen here http://www.kosmodrom.com.ua/pdf/HR911105A.pdf Now imagine a commonly used passive POE scheme which brings one power wire on 4+5 and the other on 7+8, as described e.g. here https://en.wikipedia.org/wiki/Power_over_Ethernet Tha...


CAN bus

Started by Anonymous in sci.electronics.design4 months ago 11 replies

A customer wants us to build a box (basically a cinder block bristling with connectors) that includes a CAN bus for control. We'd...

A customer wants us to build a box (basically a cinder block bristling with connectors) that includes a CAN bus for control. We'd include ethernet too, for more general use. Can someone recommend a good chip or chip set to do slow CAN? A good eval kit or equivalent? A good way to make a PC talk CAN? We'd have an internal uP, one of the ST Arm things. -- Father Brown's figure re...


VOIP bandwidth conflicts

Started by John Larkin in sci.electronics.design4 years ago 22 replies

We are planning the networking for our new place. It will be all GHz CAT6, with a couple of 48-port switches. We'll be going VOIP for...

We are planning the networking for our new place. It will be all GHz CAT6, with a couple of 48-port switches. We'll be going VOIP for the telephones, which means that each rented phone just plugs into the nearest ethernet switch. Our IP consultants want a separate network and separate switches for the phones, their concern being that data traffic could make the phones strutter. We don'...


OT: Network continually stalling

Started by Robert Baer in sci.electronics.design9 years ago 90 replies

Have NIC card replacing on-board Ethernet support now; made zero difference WRT problems: 1) Say i attempt to login to my Google e-mail or...

Have NIC card replacing on-board Ethernet support now; made zero difference WRT problems: 1) Say i attempt to login to my Google e-mail or other account OR change pages while browsing (say looking for parts on Mouser website). Data transmission and reception STOPS for an indeterminate amount of time and may or may not continue for an indeterminate amount of time - sometimes "foreve...


OT: Refuse to copy file - AVAST is rootkit

Started by Robert Baer in sci.electronics.design8 years ago 5 replies

Robert Baer wrote: > ** SNIPped previous stuff ** > > Since i am having a VERY repeatable problem with that FA930-C program > > set,what...

Robert Baer wrote: > ** SNIPped previous stuff ** > > Since i am having a VERY repeatable problem with that FA930-C program > > set,what i could try is: (a) UNPLUG the EtherNet cable - making external > > attacks and intrusion impossible, (b) prevent Avast from loading, (c) > > fiddle around to see if i can fix the FA930-C problem and then see if i > > can Pete again (re-Pete) the locking g


Preventing a BJT from exploding using only base current

Started by Aleksandar Kuktin in sci.electronics.design7 years ago 16 replies

Hi all! TL;DR: when a BJT sits naked (no DC resistances on either the emitter or collector, but well controlled base current) between Vcc and...

Hi all! TL;DR: when a BJT sits naked (no DC resistances on either the emitter or collector, but well controlled base current) between Vcc and GND, is it safe to use ONLY the base current to prevent it from releasing magic smoke? Details below. I'm building a transmitter for a wired interface (Ethernet). I chose to drive the transmission line itself with a transformer which is in turn...


AT&T DSL modem, get rid of high pitch noise?

Started by John Doe in sci.electronics.design10 years ago 3 replies

I have an AT&T DSL modem that they sent to me. SPEEDSTREAM 5100 ethernet ADSL modem. It emits a high pitch squealing noise. It's barely...

I have an AT&T DSL modem that they sent to me. SPEEDSTREAM 5100 ethernet ADSL modem. It emits a high pitch squealing noise. It's barely audible, but it's unpleasant. Can anybody guess what that sound might be and tell me if there is something that can be done to stop it. I seriously don't want to use it, so I do not at all mind risking its destruction. Soldering is no problem here....