18650 battery holder

Started by Andy in sci.electronics.basics21 hours ago 3 replies

Is this the right battery holder so that I get 3.7...

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-Hold ers/132730830743?hash=item1ee75fbf97:m:mBZqCocJbuoDRghrmatEjaQ:rk:17:pf:0 Thanks.


18650 for 3.0 v application ?

Started by Andy in sci.electronics.basics1 day ago 5 replies

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...

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


mutual capacitance?

Started by RichD in sci.electronics.basics3 days ago 22 replies

Looking at network theory and the duality theorems, why is there no mutual capacitance? i.e. electric flux linkages, symmetric to mutual...

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


Looking for 2mm pitch 2-row female connectors

Started by Adrian Caspersz in sci.electronics.basics4 days ago 4 replies

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! ...

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 https://app.box.com/s/m59hmwze1fzls1mtefa0e7wcrtdxm0pj 8, 10, and 12-way required. I'd be happy with either crimps/housings or IDC headers. Can anyone identify the make and series, and suppli...


Dr Shantanu Panigrahi - UK's Unsung Hero, Suing 800 Wicked People

Started by Anonymous in sci.electronics.basics1 week ago

INTRODUCING TO YOU https://shantanup.wordpress.com (you are invited to comment there where you will not be moderated or censored) Dr Shantanu...

INTRODUCING TO YOU https://shantanup.wordpress.com (you are invited to comment there where you will not be moderated or censored) Dr Shantanu Panigrahi, 3 Hoath Lane, Wigmore, Gillingham, Kent, ME8 0SL, UK, also Plot 2457/1 Gourinagar, Bhubaneswar 751002, Odisha, India also A13/3 Kalindi Housing Estate, North 24 Parganas, South Dumb Dumb, Kolkata 700089, W.Bengal, India Dr Panigrahi is ...


PC PSU repurposing

Started by Bob Engelhardt in sci.electronics.basics4 weeks ago 7 replies

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...

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 outputs without loads. Is it a bad idea to run it that way? Thanks, Bob


efficiencies of appliance 3-phase brushless motors?

Started by Anonymous in sci.electronics.basics1 month ago 26 replies

Hello, What is the ballpark efficiency range of washing machine or clothes dryer three-phase 110-volt AC motors? I'm debating tearing a...

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 but was curious if the efficiency is too low to bother. Thanks, Michael


More Math I Never Did

Started by Anonymous in sci.electronics.basics1 month ago 14 replies

Inductors. Where: R=radius D=diameter l=length N=number of turns L=inductance Then it is L=(N^2 x D^2)/((18 x D) + (40 x l)

Inductors. Where: R=radius D=diameter l=length N=number of turns L=inductance Then it is L=(N^2 x D^2)/((18 x D) + (40 x l)


EVs Will Soon Be Vastly Cheaper To Own Than Carbon Fuel Vehicles

Started by Bret Cahill in sci.electronics.basics1 month ago 34 replies

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better...

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better battery will appear, however. They have good information on it and it isn't all that insider: http://www.businessinsider.com/new-discovery-could-be-death-blow-to-traditional-lithium-ion-batt eries-2017-12 https://www.theguardian.com/environment/2017/dec


component identification please

Started by Anonymous in sci.electronics.basics2 months ago 11 replies

I have searched google but cant identify these two components. I think they are Diodes. they look like Diodes, Black with two conductors at...

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 it that are printed at one end that are repeated around the circumference of the component that is mayb 1/8 of and inch thick. It is two solid triangles repeated around the end. E.G. /\ \/ /\ ...


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