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Useful link reference and formulas.

Arcstarter, Mon Mar 23 2009, 03:29AM

The main idea of this thread is to help new members with calculations and assorted stuff by having a sticky thread with links to calculations and stuff like that, to perhaps reduce the amount of rather pointless posts. Not naming anyone, there have been very many.

I am basically requesting a sticky thread. Here are my links that are very helpful, and if you wish to contribute, we could get a long list going, and have it stickied.

Also as a sidenote, remember to look into the rules!

Basic Electronics

Calculators

Graphical resistance calculator. Choose the band colors, and it calculates the resistance.

A 555 astable frequency/duty cycle calculator.

Very useful for coilguns. Capacitor energy storage in joules.

Volts or watts into amps.

calculate cm^-1, nm, mS/uS/nS

A better 555 calculator, but needs to be downloaded.

Good RLC simulator, and other coilgun info.

Inductance calculators, for different types of coils.

ANSI PCB trace width calculator.

Ohms law calculator. Good for calculating stuff like resistance dividers, voltage drop across a given resistance at a given current, and such.

Transistor base resistor calculator

Java applications

Very useful java applets of science and physics.

Datasheets and info

Datasheetcatalog for semiconductors. I use this place, and only this place. They have almost everything. Just type in the top yellow bar.

Franks electron tube data sheets for vacuum tubes. This place has most of the tube i look for.

Another good website for vacuum tube datasheets.

A very useful PDF, explaining a lot about IGBTs.

Wire sizes in mm, inches, and AWG, and current carrying capacity for chassis and power transmission.

Another semiconductor datasheet site. Sometimes has the parts others do not.

National semi's guide to switch mode DC-DC converters/regulators.

Maxim IC's power circuit app notes either by purpose or topology, a favourite reference of mine

Maxim IC's DC-DC PSU cookbook (a big table of Vin, Vout, Iout, and the regulator + circuit) - great for quickly adding a known working design into something without having to do as much research and part selection.

Miscellaneous

Tube amplifier schematics. In Italian, but you can use google translate, or just guess the catagories.

Amplifiers, simulation programs, and a database.

Some good helpful schematics.

Tons of information about many different areas of electronics, from PLLs to televisions.

Tons of scanned electronics books, plenty of information about many electronic devices.

Tesla coils

Calculators

Tesla coil calculations (MMC calc, resonant freq calc, capacitor to transformer calc, and much more).

More tesla coil calculators, and other cool stuff.

MMC calculator for SGTC, DRSSTC and QCW

Information

This site has alot of information about solid state Tesla coil theory, spark gap Tesla coil theory, induction heaters, and much more.

If you have something you want to know about tesla coils, Tesla Downunder is great. It also has a bunch of other neat stuff, too. Definately suggested.

A short but useful list of what small capacitors, in a MMC setup, have been found to be good and bad in Tesla coil use.

Some cool calculations/formulas

DRSSTC design guide, a walk-through on component selection

High voltage:

High voltage DC probe.

High voltage AC probe.

Other misc formulas and calculators:

Cm to inch and vice versa. Remember, a mm is a tenth of a cm.

MPH to KPH conversion.

Misc calculators for all sorts of things.

Length of wire (in feet) for a given number of turns around a toroid of given dimensions:

(T * (OD - ID + 2 * H) + (ML / 2.54))

Where:
-T is number of turns
-OD is outer diameter of toroid in inches
-ID is inner diameter of toroid in inches
-H is height of toroid in inches
-ML is mean length of toroid in centimeters (usually given as centimeters)

Surface area of a toroid in square centimeters:

pi * (OD + ID) * H + (pi * (OD / 2)^2 - pi * (ID / 2)^2)

-OD is outer diameter of toroid in centimeters
-ID is inner diameer of toroid in centimeters
-H is height of toroid in centimeters
-------------------------------------- ---------------------------------------------
Still accepting more, you can never have too many!

Re: Useful link reference and formulas.
Chris Cristini, Mon Mar 23 2009, 03:43AM

What about this one.

volts/watts to amperage calculator.
Ohms law calculator

Re: Useful link reference and formulas.
Dr. Slack, Mon Mar 23 2009, 01:40PM

This stuff really belongs on the wiki, some of it might already be there, any chance you duplicate it there? It will be more natural to do that when the wiki is more visible from the main page.

Re: Useful link reference and formulas.
aonomus, Mon Mar 23 2009, 02:08PM

Once the list grows further I could duplicate it to the wiki, I suggested on IRC to Arcstarter to put the thread here to give it some more publicity so more people could contribute.

Also it would be best to divide that list into a few sections: calculators & reference guides, how to guides, and theoretical reference.

Also, links:
Frequency/period/wavelength calculator, always handy for when you don't want to do a bunch of different conversions from cm^-1, nm, mS/uS/nS.

How to:
HVDC probe (DC only, lossy at AC freq's.):

HVAC probe

Re: Useful link reference and formulas.
Shaun, Mon Mar 23 2009, 07:27PM

I love this site:

1728.com

Check the physics section for electronics related calculators, but also see their Ultra Calculators. The site would be a vital bookmark for everyone here.

Re: Useful link reference and formulas.
big5824, Mon Mar 23 2009, 07:32PM

cant forget barrys site

Most useful part is the two java aps down the side

Re: Useful link reference and formulas.
Mads Barnkob, Mon Mar 23 2009, 07:52PM

How did you miss out on JAVATC and JAVAMMC!! :D

edit:

Forgot to add this library of very useful java applets of all sorts in any field of science and experiments.

Re: Useful link reference and formulas.
101111, Mon Mar 23 2009, 08:15PM

Electronics assistant is a freeware application I'll use now and then. I recommend it.

Re: Useful link reference and formulas.
Myke, Tue Mar 24 2009, 01:22AM

MadsKaizer wrote ...

Forgot to add this library of very useful java applets of all sorts in any field of science and experiments.

Here is a couple useful circuits that are in that page

Re: Useful link reference and formulas.
Chris Cristini, Tue Mar 24 2009, 02:44PM

Here is a good one for 555 timers.

Re: Useful link reference and formulas.
Arcstarter, Thu Mar 26 2009, 12:36AM

Good job guys, thanks for contributing to 4hv!

A thanks also to aonomus, and others on the IRC for suggestions and such.

Keep it up guys, you can never have too much information!

Re: Useful link reference and formulas.
Mads Barnkob, Thu Mar 26 2009, 08:07PM

you should update your first post with the links we have replied with, and maybe catagorize them :)

Re: Useful link reference and formulas.
KLH, Fri Mar 27 2009, 05:44PM

Here are two that I have created on my own. I haven't seen them anywhere else, so I decided to post them here.

Length of wire (in feet) for a given number of turns around a toroid of given dimensions:

(T * (OD - ID + 2 * H) + (ML / 2.54))

pi * (OD + ID) * H + (pi * (OD / 2)^2 - pi * (ID / 2)^2)

-OD is outer diameter of toroid in centimeters
-ID is inner diameer of toroid in centimeters
-H is height of toroid in centimeters

Re: Useful link reference and formulas.
Arcstarter, Sun Mar 29 2009, 02:37AM

First post updated with all of the links, categorized and such.

UPDATE: Fixed Killah573's formula, fixed a spelling error (i spelled it whats instead of watts if you must know XD). Thanks Killah573 and MadsKaizer for letting me know.

I also added two of the datasheet places i use under a new catagory for datasheet places.

Re: Useful link reference and formulas.
Coronafix, Mon Apr 27 2009, 10:13PM

Quick Inductance calculator

Maybe this thread could be a sticky?

Re: Useful link reference and formulas.
twist2b, Mon Apr 27 2009, 11:10PM

You guys are awesome!! This is such an awesome reference.. I was always annoyed how hard it was to get my hands on all these...

Anything about Herts? I realize its a simple frequency formula [F(x) = A(sin/cos)(X+b)-c] But it would be good to find a quick method to transfer hert to formula QUICK...

Re: Useful link reference and formulas.
Arcstarter, Wed Aug 05 2009, 11:33PM

It has been awhile since i have even thought about this thread. I am going to sorta bump it, maybe new members can contribute, and some people may have more to add.

I am restarting it mainly because i added a new link. It is very useful information about IGBTs. If you are planning a drsstc and do not know what IGBT's are best, this is a good thing to read. It talks about temperature coefficients, NPT and PT (non punch through and punch through) differences on page three, that is one of the most useful pieces of information i have read yet. It has been added to the original post, but for convenience, here it is:

Re: Useful link reference and formulas.
klugesmith, Wed Aug 05 2009, 11:44PM

Thanks for creating and maintaining the list, and reminding us of it.

1. The "Ohms Law calculator" link to a compuserve page is dead.
Do you mind reviewing the rest of the list, or want a volunteer to do that?

[edit]
2. A suggestion regarding the -organization- of your links:

A somewhat sharp line can be drawn between the many Online Calculators and Simulators,
most of which hide their formulas

and links which directly present formulas, tabular data, explanations, real-world experiences, etc.

How about if -all- links in the former category get descriptions that include the keyword Calculator, or Simulator? (Most already do.) Then readers of either persuasion can tell up front which to visit and which to skip.
The exception cases could have names with, for example, "Calculator and Formulas".

Re: Useful link reference and formulas.
Mads Barnkob, Thu Aug 06 2009, 01:30PM

Make the captions like basic eletronics, tesla coils etc in a larger type and bold, would make it seems better organised.

Alldatasheet.com almost never fails me:

Another good tube database:

Lots of tube amplifier shcematics, its in italian, but you can either google translate or its not hard to think what the catagories are if you think for a second. :

Re: Useful link reference and formulas.
Myke, Thu Aug 06 2009, 03:30PM

This is a good page for some simulation programs. I really like the tube database also.

Re: Useful link reference and formulas.
Avi, Thu Aug 06 2009, 04:18PM

tesla coil formulas
tesla coil formulas and simple calculator

Re: Useful link reference and formulas.
Dr. Dark Current, Thu Aug 06 2009, 06:48PM

Anyone mentioned javatc?

Edit: Oops, MadsKaizer mentioned it, but there was no link so I overlooked it.

Re: Useful link reference and formulas.
Arcstarter, Sat Aug 08 2009, 12:13AM

Thanks alot guys!

@Avi, i added the Teslacoils4Christ, but i already had the deepfriedneon added.

@Dr. Kilovolt, i already had ClassicTesla on the list, which is the homepage of the person who made JavaTC, so i did not add the link directly to JavaTC, but you can easily find it on ClassicTesla's page.

Check the first post. I have updated it. I put the categories in bold, and the font is 20, and i also made sub-categories, which are in bold 14 font. I have also went through all of the links to make sure they still work.

It feels like i left stuff out, so if you see something, reply to this thread or PM me. I will also check over it, but there is no guarantee i will get anything that is missing!

Thanks alot guys, i visit this thread occasionally for the links. They are very helpful!

EDIT:
I fixed Miscellaneous under general electronics, i messed up when i tried to make it bold, and i also found that i did not re-add Myke's link to Falstad's circuits, and i also found that i forgot to add CoronaFix's Inductor calculator. All of this has been fixed.

Also, i wrote all of this in wordpad which does not have any word correction, so a mis-spelled word could have snuck in there. If so, let me know!

Re: Useful link reference and formulas.
Chris Cristini, Sat Aug 08 2009, 03:05AM

Nice job Arcstarter looks good.

Re: Useful link reference and formulas.
Nicko, Mon Aug 10 2009, 08:44AM

Blowing my own trumpet (eh?) I wrote the following a few years ago - its pretty widely used (500+ hits a day).

ANSI PCB/PWB Track/Trace Width Calculator

Valid up to 35A and 400mil traces.

Re: Useful link reference and formulas.
Arcstarter, Tue Aug 11 2009, 10:55PM

Nicko, your link has been added. Also, thanks for the compliment, Chris

Re: Useful link reference and formulas.
Arcstarter, Sat Aug 15 2009, 12:39AM

A new *working* Ohm's law calculator has been added, at the bottom of the basic electronics calculator links.

Comments and suggestions encouraged 8D

Re: Useful link reference and formulas.
aonomus, Sat Aug 15 2009, 01:52AM

National semi's guide to switch mode DC-DC converters/regulators:

Maxim IC's power circuit app notes either by purpose or topology, a favourite reference of mine:

Re: Useful link reference and formulas.
Nicko, Sat Aug 15 2009, 11:25AM

How about LTspice - truely a wonderful free tool...

Don't bother to register unless you feel the urge - just click on "No thanks..." and just download it.

Support for this is through the very active Yahoo! group LTspice... (the developers hang out there).

I've used this for years, and it just gets better & better...

Re: Useful link reference and formulas.
Mads Barnkob, Mon Jan 18 2010, 04:01PM

This thread should get a sticky :)

Here is a huge collection of scanned electronics books that have not had their copyright renewed.:

Re: Useful link reference and formulas.
Arcstarter, Fri Feb 05 2010, 07:12PM

Yay, this thread is now sticky! At some point i will add it to the hv wiki. Perhaps i should wait 'till the new site is done?

Sorry about that Mads, i just realized you posted something! I rely too heavily on the green dots, i need to break that habit! I added it under General electronics: misc. Seeing that the organization is still pretty cruddy, that was the best place i could think of.

Always accepting more links

. There is a huge amount of information, picking out all the good bits would take a *very* long time. So if and when you trip upon something, post it here

. This thread sure has been helpful to me.

Thanks for participating, everyone!

Re: Useful link reference and formulas.
Nicko, Fri Mar 19 2010, 07:09PM

Heavily updated my ANSI PCB Trace Width Calculator (see top post or

Now allows metric or imperial units, changes to units on the fly, use of cookies to store preferences and updates to reflect current status of the ANSI standard.

Comments welcome.

Re: Useful link reference and formulas.
unclejoe, Tue Apr 06 2010, 02:00AM

the following site has a number of general purpose conversions calculators:

i've found it handy as a reference.

Re: Useful link reference and formulas.
Pinky's Brain, Mon Jun 28 2010, 09:54PM

I found this Army Research Lab paper illuminating :

Analysis and Design of Resonant Charging System

It goes through the math of resonant charge transfer from one capacitor to another through a transformer over multiple cycles in a very thorough text book like manner (for ideal components). It's not aimed at Tesla coils, it's mostly concerned with two cycle transfer with k=0.6, but the formulas are given for higher number of cycles with lower k.

Re: Useful link reference and formulas.
Plasmana, Sun Aug 29 2010, 11:05PM

Electronics 2000 has quite a few good 'advanced' calculators:

Re: Useful link reference and formulas.
sngecko, Thu Dec 16 2010, 11:15PM

I've come across several:

All sorts of physics and electronics tutorials (I especially like the Schmitt trigger calculator and voltage divider calculator)
http://hyperphysics.phy-astr.gsu.edu/Hbase/hframe.html

Re: Useful link reference and formulas.
SaberShip, Sun Jun 24 2012, 04:38AM

My Bookmark list keeps growing and growing!! Thanks every one!