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 > Your search for posts made by 'LScamper' found 32 matches.

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  Subject Author Date Posted Forum
RE: What's your favorite app?

LScamper 11/22/15 04:47pm Technology Corner
RE: Circuit simulation software

"pspice is another good alternative. interfaces nicely to orcad and cadence design layout tools." The free version has limitations but I don't know what they are. Do you? LTspice is the full unlimited version.
LScamper 11/20/15 05:34pm Tech Issues
Circuit simulation software

Spice circuit simulation software has been mentioned here several times. When I was in the business I used a circuit simulation program to test designs before they were prototyped. The versions of Spice that I used cost $5,000.00 > $10,000.00 plus about $1000.00 per year maintenance. Today you can download a free version that does the same thing and is free. It is called LTspice. The main difference is that the expensive ones come with more components in the package but you can add them to the free one with a little work. The video in the link below is a little old but should show you how to get the program and start using it. LTspice download
LScamper 11/20/15 03:31pm Tech Issues
Heatsink design 101

Some of you are designing LED lighting and need to use heatsinks. These videos may help in doing the job correctly. Thermal Design 101 Thermal design sucks
LScamper 11/20/15 11:42am Tech Issues
Kirchhoff's circuit analysis for the curious

Kirchhoff is often mentioned on this forum. These two videos explain Kirchhoff. This may be interesting to some that want to understand more about their 12V DC circuits. It is very advanced for the beginner and uses some math. Kirchhoff's law 1st video Kirchhoff's law 2nd video
LScamper 11/20/15 09:05am Tech Issues
RE: Super Cap USB Charging Recharging (?)

Here's the deal. My cell phone battery is rated at 2,800 mAh (2.8 Ah) at 3.85 V. Watt-hours equal Amp-hours x Volts, 2.8 x 3.85 = 10.78 Wh. To convert Watt-hours to Watt-seconds multiply by 3600. So 10.78 Wh = 38,808 Watt seconds, the total amount of energy stored in this fully charged battery. One Watt-second = one Joule. A Joule is the measure of energy. So the total energy stored in this battery is 38,808 Joules. Now for the 16 farad capacitor. Total energy stored in a capacitor is total Joules = (Volts x Volts x capacitance)/2. Total Joules = (5.5V x 5.5V x 16 farads)/2, total Joules = 242 Joules stored in this 16 farad capacitor. So the battery stores 38,808 Joules and the capacitor stores 242 Joules. Divide 38,808 Joules by 242 Joules and get 160.36. Bottom line is that the battery stores 160.36 times more energy than the 16 farad capacitor! Of note is that you will not be able to transfer all the 242 Joules from the capacitor to the battery.
LScamper 09/21/15 02:19pm Technology Corner
RE: Parallel then series, or the other way around?

"You didn't doubt Kirchhoff, did ya?" Kirchhoff is never wrong, but at my age my math is!
LScamper 08/24/15 08:45am Tech Issues
RE: Parallel then series, or the other way around?

Spice circuit simulation confirming Salvo's calculations. 105 Amp constant current load. Also tried to simulate Amp hours and state of charge vs time. The vertical scale should be Amp, Amp hours and percent state of charge not volts as is shown. The horizontal axis is in seconds. 3600 seconds is one hour. The colors may not show up very well, but I tried. Amps http://i.imgur.com/a2w5EKRl.jpg "border=0" http://bit.ly/1CIRlV8 Amp hours http://i.imgur.com/HkUrZOLl.jpg "border=0" http://bit.ly/1CIRlV8 State of Charge http://i.imgur.com/QycQ3Vul.jpg "border=0" http://bit.ly/1CIRlV8
LScamper 08/23/15 05:21pm Tech Issues
RE: Parallel then series, or the other way around?

"And here come the experts In some ways Norton’s Theorem can be thought of as the opposite to “Thevenins Theorem”, in that Thevenin reduces his circuit down to a single resistance in series with a single voltage. Norton on the other hand reduces his circuit down to a single resistance in parallel with a constant current source." Exactly!! Nitpicking that's all. n7bsn wrote: "Please explain your theory using Norton's Theorem" Norton and Thevenin both create a black box with the equivalent circuit in it. You can't tell what is happening inside the box from outside measurements.
LScamper 08/22/15 03:40pm Tech Issues
RE: Parallel then series, or the other way around?

hotpepperkid wrote: "Good luck with that. Doesn't Norton's Theorem just simplify any circuit containing resistance and a voltage source to an equivalent circuit" Not correct
LScamper 08/22/15 02:51pm Tech Issues
RE: 100% Of The Capacitors Turn-Around In My Old WhiffCo.

MEXICOWOANDERER wrote: " I have a 330uf 450vac axial cap ready to install across the output." I'm not sure I understand. Are you planning to connect the 330uf cap on the output from hot to neutral? If so why, seems like a bad idea.
LScamper 08/19/15 10:29am Tech Issues
A look inside 80W ceiling LED

This may be interesting to those playing around with high power LED lights. 80W LED teardown. Teardown Video
LScamper 07/30/15 08:59am Tech Issues
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