T&L Publications

Seven years ago I purchased three peices of test equipment. These are hi-end equipment (HP and SYNTONIC) all with very accurate time bases (10 Mhz).They were used commercially for thousands of hours over a ten tear period before I purchased them.These time bases have specked accuracies into the eigh...

Can anyone answer this for me? In regards to quartz crystal specifications, the term crystal aging is always listed. It is usually given in PPM per year or month. This is the natural drift error over time even when all other parameters are held constant.As often as I have seen this spec., it has nev...

Since you neglected to describe motor size and what it originally came off of, its hard to suggest a cure. But I will say this, if it is of a very lo starting torque such as syncronous or small fan motors -any buildup of crud or old lubricant on its bearing surfaces will prevent it from starting,unt...

entity Movs made for 120ACV lines are usually labeled that in catolog. These begin to breakdown at 330 volt peaks. Movs for 240VAC lines have labeling the same way. These will begin to break down at 600 plus Volt peakThese are what you want respectivly. Since line transients are more likly to affect...

Benabean- Maybe your best bet is to forget about modifying your foot switch. Go right into the amp itself. From here you may find better interfacing plus a source of power. After that you can install a jack on your ampl. and then plug a cord in for your indicator. As a matter of fact, the only thing...

Need more info on whats inside the box. An LED circuit perse is about as simple as it gets, however interfacing to any given circuit could be a head ache. Need to knw if your box contains AC or DC. Hi-Volt. or Lo-volt. From the picture it looks like the switch could handle Hi-Volt., but the phone pl...

Its summertime. You don't have no stinking job to go to.
Head for the shores and be a beach bum. This has been my dream all my life,but never got canned in order to do it.

Gorgon- -How do tou do this? Would like to check out a few suspisious remotes.<p>[ June 15, 2005: Message edited by: ROBERT REED ]</p>

Maybe that was the reason the capacitor never fully charged.

The capacitor is IDEAL, the 10 volt source is real world. I know this is a lot of nonsense, but I just thought it would get the gray matter stirring in some of you.

Stephan- I understand and agree your last post 100%. But we are not considering duty cycle in my example. This squarewave is not a pulsed DC, It is an ac waveform, first driving current one direction thru the load and then alternating current the other direction thru the load. Hence, an AC voltage (...

Jon I am assuming you want to bar graph frequency.Once you come out of the frequency/voltage converter, you can drive an LM3914 with it.This is a 10 level bar graph driver chip. You can google this up for specs and see if it is what you need. National also makes a nice freq./ volt. chip. The number ...

But we are not computing power at this point ,merely RMS voltage ,the same way we compute for an AC sine wave. Hence the rms voltage is the peak voltage which also is the equivilent DC voltage. I believe the RMS voltage is the equivilent of a DC voltage that would produce the same amount of heat dis...

While we are on the subject of capacitors and time constants, heres a good trivia question for you. An ideal capacitor of 1 MFD is placed across a voltage sorce of 10 volts-- how long does it take for full charge? Answer--beyond infinity. Since a capacitor can only charge ~63% of the remaining suppl...

Gorgon has a good point. One other thing to remember in your calculations- is that in one time constant, the initial charged voltage will drop to 37% of its original value.Your indicator lamp may drop out prior to this point in time, so you may want to factor minimum lamp voltage into your equation....