Search found 18 matches
- Mon Jun 23, 2008 10:56 am
- Forum: General Discussion
- Topic: Theory behing 110 V AC RC driver Circuit ???
- Replies: 9
- Views: 5290
- Mon Jun 23, 2008 10:03 am
- Forum: General Discussion
- Topic: Theory behing 110 V AC RC driver Circuit ???
- Replies: 9
- Views: 5290
Theory behing 110 V AC RC driver Circuit ???
A while back I saw a post about powering an LED using 110V AC. The circuit consisted of wiring the LED in series with a 1K resister and .1 uF capacitor. A reversed diode was also wired in parallel with the LED to protect the LED from reverse bias. I have a few questions about the circuit: 1. How wer...
- Mon Jun 23, 2008 4:52 am
- Forum: General Discussion
- Topic: Help with LRC, Complex Numbers ???
- Replies: 1
- Views: 1855
Help with LRC, Complex Numbers ???
I am trying to understand XLR circuits and the use of complex numbers to find solutions. I think that I am applying and interpreting the math correctly but would feel more comfortable if someone with more experience took a look at what I am doing... Suppose that a 50 ohm resistor, 1 uH inductor, and...
- Mon Sep 19, 2005 7:56 am
- Forum: General Discussion
- Topic: Naked PC power supply
- Replies: 8
- Views: 4082
Naked PC power supply
I am trying to get some PC power supplies to work with not computer attached. I know they won't start without a load so I have tried connecting up a floppy drive, hard drive, and CD drive at the same time but the power supply still won't come on. It is one of the newer types of supples with no on/of...
- Wed Sep 14, 2005 8:51 am
- Forum: General Discussion
- Topic: How to directly hook up Nidec HD Spindle Motor???
- Replies: 3
- Views: 2775
Re: How to directly hook up Nidec HD Spindle Motor???
Thank you for your replies. I am leaning towards just using the circuit board supplied with the HD to run the motor. However, when I try this the drive will spin up to full speed and run for about a minute then it will shut off. If I disconnect power and reconnect the drive will run for another minu...
- Tue Sep 13, 2005 12:00 pm
- Forum: General Discussion
- Topic: How to directly hook up Nidec HD Spindle Motor???
- Replies: 3
- Views: 2775
How to directly hook up Nidec HD Spindle Motor???
I have a bunch of old computer hard drives that I am taking apart to salvage the magnets, bearings, platters, and other misc parts. They have Nidec 59-004046-001 spindle motors that I want to try to hook up directly to power if possible to make them run. I am looking for a data sheet on this motor. ...
- Wed Apr 28, 2004 6:32 am
- Forum: General Discussion
- Topic: Can't identify type of gate in diagram explaining inner
- Replies: 1
- Views: 1771
Can't identify type of gate in diagram explaining inner
There is a really good graphical simulation of the inner worrkings of a 555 timer chip at http://www.williamson-labs.com/ under 555 on the left frame.<p>However, I am trying to follow what is happening and think that I almost understand. I need some clarification of what type of logic gate is just b...
- Tue Dec 30, 2003 12:47 pm
- Forum: General Discussion
- Topic: Where's the spark ??
- Replies: 6
- Views: 3345
Where's the spark ??
I am thinking about building an EDM (electric discharge machine) which remove tiny bits of metal by sparks. I have found plans and schematics on the web and in various magazines like Home Machinsts Workshop. I could just blindly copy their designs, but I wanted to understand how they work first. Mos...
- Wed Feb 19, 2003 9:53 am
- Forum: General Discussion
- Topic: Motion Detection in NTSC Signal
- Replies: 5
- Views: 3341
Re: Motion Detection in NTSC Signal
This sounds interesting. How do you find the average voltage level? I have a feeling it is some type of circuit using op amps.
- Thu Feb 13, 2003 1:17 pm
- Forum: General Discussion
- Topic: Poptronics Is Gone???
- Replies: 48
- Views: 32493
Re: Poptronics Is Gone???
Check out http://www.epemag.wimborne.co.uk/<p>You can subsribe to this magazine and download it in .pdf format each month. It is just as good as Poptronics.
- Thu Feb 13, 2003 1:09 pm
- Forum: General Discussion
- Topic: Motion Detection in NTSC Signal
- Replies: 5
- Views: 3341
Motion Detection in NTSC Signal
I am looking for information on how to detect motion in NTSC signal from one of those cheap 1" square cameras. Is there a cheap off the shelf chip or little black box that could look for changes in the NTSC signal? I am currently only interested in black and white. I am sure that this is not th...
- Wed Mar 27, 2002 6:47 am
- Forum: General Discussion
- Topic: Need help with Quardatrue Encoder Theory
- Replies: 4
- Views: 5189
Need help with Quardatrue Encoder Theory
To test my understanding of how a quadrature rotational encoder works, I set out to design a software simulator. To keep things simple, I decided to simulate a wheel with 8 evenly spaced holes. I should be able to get 4 times the resolution or a total resolution of 32. However I cannot figure out wh...
- Tue Jan 08, 2002 1:13 pm
- Forum: General Discussion
- Topic: Puzzled about current producing devices ??
- Replies: 2
- Views: 3286
Puzzled about current producing devices ??
I have been studying various op-amp circuits and I have come across the current to voltage convertor circuit. I am slightly puzzled by the term "current producing device" in the circuit. Wouldn't there also be some sort of voltage produced across this device's terminals?
- Thu Dec 20, 2001 5:03 am
- Forum: General Discussion
- Topic: Help with simple diode circuit ???
- Replies: 13
- Views: 10313
Re: Help with simple diode circuit ???
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by john albers: [QB][/QB]I mean reply with quote button. I think that you also have to type your message between the quote tags.<hr></blockquote>
- Thu Dec 20, 2001 5:01 am
- Forum: General Discussion
- Topic: Help with simple diode circuit ???
- Replies: 13
- Views: 10313
Re: Help with simple diode circuit ???
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by RonH: John Albers knows how to post a quote. You there, John?<p>I clicked on the post with quote button.<p>Ron H <hr></blockquote>