structural analysis , By Hibbeler , 3rd ed

Started by Anonymous in sci.electronics.basics2 months ago

solutions book team i n e e d s o l u t i o n s b o o k @ h o t m a i l . c o m ineedsolutionsbook(at)hotmail(dot)com...

solutions book team i n e e d s o l u t i o n s b o o k @ h o t m a i l . c o m ineedsolutionsbook(at)hotmail(dot)com ineedsolutionsbook@hotmail.com We're a team for providing solution manuals to help students in their study. We sell the books in a soft copy, PDF format. We will find any book or solution manual for you. Just email us: i n e e d s o l u t i


MC6840 Projects????

Started by Anonymous in sci.electronics.basics2 months ago

Any suggestions for projects I could do that involves the Motorola MC6840 programmable timer module? I just received a peripheral for the Apple II...

Any suggestions for projects I could do that involves the Motorola MC6840 programmable timer module? I just received a peripheral for the Apple II that has this chip onboard. It basically allows for applications that involve timers, such as reading digital potentiometers, among other things. Thanks!


VOX- Voice operated Relay with mods.

Started by amdx in sci.electronics.basics2 months ago 2 replies

I'm starting to develop a VOX circuit to solve the following problem. Wife got new smart phone after flip phone went in water. We're on a...

I'm starting to develop a VOX circuit to solve the following problem. Wife got new smart phone after flip phone went in water. We're on a boat. Wife's phone is inside now, she's outside working, can't hear the phone ring. Won't take the phone outside, I think she thinks she paid $0.01 for the flip phone and $200 for the smart phone and won't take a chance with it. So I want to build ...


Transformerless power supply

Started by amdx in sci.electronics.basics2 months ago

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus depending on other components. Maybe 9- 20uf caps in parallel? I'd like to build it into a leaf blower. All plastic, absolutely no metal exposed. I think I've answered my question, I have 12, X rated caps in my junk box, but they are only 1uf....


Is Class 1 laser safe enough for baby eyes?

Started by Mr. Man-wai Chang in sci.electronics.basics2 months ago 11 replies

I meant, what if someone accidentally shine Class 1 laser into a baby's eyes? Would it hurt retina and leave a permanent damage? I know ......

I meant, what if someone accidentally shine Class 1 laser into a baby's eyes? Would it hurt retina and leave a permanent damage? I know ... I know... it should NOT happen. Adults are supposed to be very very careful. :) -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ Simplicity is Beauty! /( _ )\ May the Force and farces be with you! ^ ^ (x8...


Formula for calculating run time of apc ?

Started by Andy in sci.electronics.basics3 months ago 3 replies

I am looking for a formula for calculating the run time of my APC battery system. I did a search but what I found required a particular model...

I am looking for a formula for calculating the run time of my APC battery system. I did a search but what I found required a particular model of apc. Total watts of computer and monitor is about 120 watts. Battery in my apc is 12V 18 Ah Thanks, Andy


[BBC] Einstein theory passes black hole test

Started by Mr. Man-wai Chang in sci.electronics.basics3 months ago 1 reply

[BBC]Einstein theory passes black hole test Full story: https://www.bbc.com/news/science-environment-44967491 The black hole at the centre of...

[BBC]Einstein theory passes black hole test Full story: https://www.bbc.com/news/science-environment-44967491 The black hole at the centre of our galaxy has helped astronomers confirm a key prediction of Albert Einstein's ideas. By observing a cluster of stars near the hole, they were able to confirm a phenomenon known as "gravitational redshift". It's when the wavelength of light ge...


Update: Varistor/MOV Spice Modeling

Started by Jim Thompson in sci.electronics.basics3 months ago 30 replies

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...

Varistor/MOV Spice Modeling has been updated. See VaristorMOV.zip on the Device Models & Subcircuits Page of my website. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Sa...


three terminal volt regulator

Started by George Herold in sci.electronics.basics3 months ago 11 replies

Hi all, Simple question. Some 1/2 amp LM7805 is obselete (TO-220 pac) I need a replacement. So either a 1 amp...

Hi all, Simple question. Some 1/2 amp LM7805 is obselete (TO-220 pac) I need a replacement. So either a 1 amp 7805 http://www.onsemi.com/pub/Collateral/MC7800-D.PDF or a LM340 http://www.ti.com/lit/ds/symlink/lm340.pdf Is there any (practical) difference between the two? (besides the price.) George H.


An idea that may be of some use

Started by default in sci.electronics.basics3 months ago

I needed a small light to light some steps from my deck to the ground and in a few other places. I already had a 12V system outside. For a...

I needed a small light to light some steps from my deck to the ground and in a few other places. I already had a 12V system outside. For a cheap and dirty light I took a plastic test tube (ebay/amazon) put a short section of LED strip light into it (9 leds, served with wires) then heated the open end of the TT with a heat gun, and crimped it with a sheet metal pliers to make a waterproo...


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