T&L Publications

Roughly - how much did those panels cost?

On the idea of wearing headphones that block sound while driving - I can't say for sure in all states, but some do have laws against it. Primary reason is they want drivers to be able to hear emergency vehicle sirens, horns, etc.

Lower frequencies are easier to cancel than higher. Below 100Hz low. Here's a simplified version of acoustic noise cancellation: A microphone located so that it picks up the noise. Another located near your ears. A speaker is in the acoustic space. A DSP calculates the phase and amplitude of the noi...

I looked at a few. I've seen these things before. I have yet to see one that isn't either an outright scammer, or most of them, just someone who doesn't know what they are talking about. Mangleing terms & basic electronics concepts, misinterpreting things. I have yet to see one where the invento...

Also, switchers don't like low load conditions, so you have to put a load resistor or other circuitry on the output that the regulator actually regulates. Generally, I am refering to pre ATX power supplies. The regulated output is usually the highest curent output. With older supplies it would be th...

One of the things I like about N&V is they have a range of projects - from simple / beginner to advanced. While it's unlikely that I'll own a Prius soon - 10K is the most I will pay for a car - If I did, I could handle pretty much any modification safely. Would I recommend it as beginner electro...

Sometimes it seemed like the weather had an effect, but sometimes it doesn't I had a phone line problem like that once. I kept having to tell the phone company "you have to come during or immediatly after rain to see the problem". Eventually they did, & fixed it. But I digress... The c...

Not knowing your setup, this may or may not help. I put all sites I don't like in my router's firewall. Blocks them nicely, without bogging down the computer. I have several computers on the router & hubs, on a cable modem. I use it to conviniently block any advertising site (& dataminers, e...

Is there any affordable signal level meter analyzer for cable TV signals? Or schematic for whatever RF meter that would do the job? I'd like to be able to check the signal level on the coax from my cable modem. A short sequence: All's well. Intermittant internet connection - tech checks, level too h...

@ philba - It should be equal. When the string looks like it's not moving coresponds to when you hear the beat frequency drop to zero. - to clarify my previous post: Here is an example of the tachometer / strobe I was refering to: http://www.hotektech.com/Itlab1542B.htm Not to be confused with an au...

It sounds like he is using the LED as a strobe light. So it needs to go on / off fast. = square wave. The tuning accuracy is related to the frequency / pulse rate of the flashes. Very similar idea to strobe based tachometers.

Dave

Intel mode.

I've used DigiKey since their catalog was printed on 2 sheets of newsprint paper.

They have one of the best website / component search on the web. Sometimes it is easier to pick / find a new part on thier page than the actual manufacturer's pages.

Hi, I am working on interfacing a BQ3285EP real time clock IC to a micromint 80C52 processor. I have done a *lot* of projects with the 80C52 w/BASIC, all kinds of I/O. Here's the problem: I can verify that I can progam the control registers- I can tell because I can set the bits to activate the squa...