T&L Publications

All,<p>All your replies are appreciated. I used to work on VTR servos for Sony many years ago. In those days the error signal went through a low pass filter before it was amplified to the control circuitry that drove the motors. I believe technology had progressed, and engineers realized that althou...

Hi Guys. Sorry about the delay. This is a new design for temperature regulation with PWM.<p>Yes it is an op-amp integrator. It is also "sort of" a timing circuit. The LM660 op-amp compares 2 voltages, the output of an LM35 temperature sensor pre-amplified 10X with a potentiometer voltage s...

Does anyone have any information about connecting electrolytic caps back to bck in order to use them as non-polarised caps? I've seen it before in amateur magazines years ago but I'd like a pro opinion.<p>I need some SMALL large value caps in an op-amp circuit in order to create a time constant of a...

Does anyone know if Nuts&Volts has a web page somewhere that we can post graphics? In order to include a graphic in a message here, the graphic has to have a URL web address. I don't have my own at the present time.<p>It would be handy because I can design a schematic in the free version of Eagl...

That ferric chloride stuff stained my clothes too. Then I switched to ammonium persulphate. The solution is clear and does not stain. I think it is a bit more expensive but then again you don't keep having to buy new clothes. I can get the stuff locally at the Fry's Electronics megastore.<p>Bob

Will,<p>08-15-03 Please disregard this message. I stand corrected.<p>I could be wrong in my recollection because it was about 22 years ago that I was servicing high end audio. I seem to recall that a VFET is a Sony part, that it is not a MOSFET but a depletion mode JFET, requiring a "reverse&qu...

I have a correction. It can't possibly be the August edition because they were only sent an evaluation system about 2 weeks ago. This link seems to have a date. It is a preview of the article including the peechers. Have a look:<p> http://www.popularmechanics.com/technology/tech_tuesday/2003/8/tech_...

Thanks Guys.<p>I just found out that our computer liquid cooling system was also evaluated by Tech Edge magazine but this must be a low circulation mag becaus I can't find one. I just found out an article with pictures of the guts is also now in the August issue of Popular Mechanics.<p>This thing is...

Buford,<p>Could you please be more specific about the temperature and time control? Temperature of what? What temperature and why? Time control of what? Specific times or time periods and how long?<p>What is the coil voltage or make and model of the relay if you have already chosen a specific relay?...

Ryan,<p>Isn't your daytime running light circuit wired into the parking brake? Mine is. Those lights don't come on until the brake is released.<p>Bob

Wow. All this discussion and all Riptide really needs is an audio isolation transformer.<p>Goes to show that it's good to find out what people are trying to accomplish whan they ask a technical question.<p>Bob

Hi Guys,<p>One of the projects that I was working on that I had to keep secret is now on the cover of the July issue of Maximum PC and it's going to be in the August issue of PC Gamer. :D <p>It's a small super high efficiency circuit used in a computer liquid chilling system.<p> :D :D :D <p>Bob

Sure,<p>Data books have been mostly replaced by the internet. If you know TI has the data sheet, look up the part number in the parts search engine on the ti.com home page, click on the datasheet .PDF file and print it. If you don't know the maker, just using a regular search engine like dogpile.com...

Devon,<p>You might look into pico motors (piezoelectric) if you are looking for any good beam aim accuracy. At work we use them to align LASERS in our manufactured products (scanning silicon wafers for defects).<p>Here is a link not affiliated with us: http://www-rfi.fnal.gov/global/technotes/TN/TN0...

Bodgy,<p>Have you checked into Eagle software which does schematics and layout. They are at cadsoftusa.com (and other countries).<p>There is a demo version for Windows downloadable that is limited to 2 layers and small boards about 3 X 3 inches. This was ample for my project. The program takes a cou...