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The most recent discussions

Re: British intelligence chiefs say Huawei SHOULD be allowed to bid for UK ...

February 19, 2019, 10:43 am

Who care, anyway US is spying us all. Us is manipulating as they don't have 5G ready and huawei is way above us product. Read more »

A question about led drivers

February 17, 2019, 3:04 pm

I've no experience with them so any info could be helpful. My question is that it seems to me that there are often a series of drivers from a manufacturer with similar prices and they all output t... Read more »

18650 battery holder

February 15, 2019, 10:46 pm

Is this the right battery holder so that I get 3.7 volts? https://www.ebay.com/itm/5Pcs-Empty-1-2-4-Cells-Li-Batteries-w-Wire-Leads-for-18650-Battery-Holders/132730830743?hash=item1ee75fbf97:m:mBZqC... Read more »

Looking for 2mm pitch 2-row female connectors

February 12, 2019, 9:56 am

Hi folks, I've got an industrial PC module (MSI MS-96F6). I'm looking for matching connectors. 2.54mm molex is common, 2.0mm is not! https://app.box.com/s/rlves2mmv8byz8ptmsi4t5gmvwdpjxxk ht... Read more »

mutual capacitance?

  [ 2 ]
February 11, 2019, 10:58 pm

Looking at network theory and the duality theorems, why is there no mutual capacitance? i.e. electric flux linkages, symmetric to mutual inductance and B flux. -- Rich Read more »

PC PSU repurposing

January 21, 2019, 4:36 pm

I am going to repurpose a PC PSU & I have a question about minimum loading. Many/most PSU's require minimum loads on their outputs for the outputs to be powered, The PSU that I have powers its ... Read more »

18650 for 3.0 v application ?

January 15, 2019, 6:04 pm

I have a door bell that uses 2 aa batteries. Would a 18650 work in such an application. I don't know if 4.1 volts would be too high. Thanks, Andy Read more »

efficiencies of appliance 3-phase brushless motors?

  [ 2 ]
January 9, 2019, 7:48 pm

Hello, What is the ballpark efficiency range of washing machine or clothes dryer three-phase 110-volt AC motors? I'm debating tearing a broken washing machine apart for the motor and controllers bu... Read more »

component identification please

December 27, 2018, 4:48 pm

I have searched google but cant identify these two components. I think they are Diodes. they look like Diodes, Black with two conductors at either end. 1 Says D1, only this. It has a two symbols on... Read more »


December 20, 2018, 5:46 am

You may have seen me rail against how the schools teach that inversion is t he same thing as 180 degrees out. Out of phase, by definition or etymology or whatever the fuck at least strongly implie... Read more »

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The best rated discussions


Max Frequency of SM 118A counter?

  [ 2 3 ]

Anyone know the maximum frequency of a Heathkit SM-118A? I have been all over Google with little luck. One guy said it would go to 1 GHz maybe 2 GHz, I don't think so. ... Read more »


Best Light for reading?

When choosing a Flourescent Bulb for a Task Light what is the best for reading.......my choices are 2700 Kelvin, 3000, 3500, or 4100..... Read more »


How do you test a capacitor?

  [ 2 ]

Just bought a generator and it failed within two hours of usage. Mfg. say maybe capacitor and will ship a new one. But am not sure. I have a voltmeter with capacitor readings. Know how to test for re... Read more »


Satellite radio - radio validation

I'm curious, can someone provide a simple several paragraph, basic explanation of how satellite radio authentication works? eg. If the radio is only a receiver and I cancel my subscription how does ... Read more »


Where to buy a small wheel hub motor?

Specifically, where can I buy a high quality small wheel hub motor (with wheel) like the one used for powered Trikkes? http://www.trikke.com/hd_2/Refurbished-Trikkes/Tribred-E-Kit-Upgrade http://www... Read more »


Soldering Copper to Phosphor Bronze

Does anyone know if soldering copper wire to Phosphor-Bronze make a solid and reliable electrical connection? Would it make much of a difference if the copper wire is stranded or solid? If there is a... Read more »


Software for PIC 16F876

Hello, I want to built a simple datalogger with a PIC 16F876, and found a nice schema on the net. My problem: te software (source) is written in C, but i need a hex files to program the PIC processor... Read more »


Thought experiment-will this work?

I think I pretty much understand how induction motors work. A typical single phase motor has a start winding that is approximately in quadrature electrically to the run winding. This provides the p... Read more »


UCANDO videos

If anyone has any old ucando videos on the subject of AC or DC or power supplies or amplifiers or any basic stuff and you want to sell them, at a resonable used price, I'd be interested. I'm just ... Read more »


will shortening a soldering iron heating rod cause a problem?

I need to shorten the end of my solder iron so i have more control of direction and make it more like a pen.....can i cut it down so my fingers are nearer the tip without causing a problem.....though... Read more »