T&L Publications

I've tossed the idea into another forum with limited exposure. I'd like some feedback from the people here on this obsession of mine. I've a few (very few) drawings for modules (breadboard compatible) and smt platforms (have you seen the price on these!?) for hobbyists such as ourselves.<p>One that ...

I've got an IM-62/PDR-10A by Nuclear Instrument and Chemical Corp.. I have no idea what kind of batteries it takes, and the calibration sticker is too dirty to read. It appeared to be in good shape, and was going for a buck a pound, so I bought it hoping for the best. Can anyone here tell me what ba...

I'm sorry that I can't provide the resource to find it but I read of a kind of sea snail that has very few neurons. The number twenty something comes to mind but I can't be sure. The reason it was mentioned in the article was that they are almost large enough to see without magnification. Their larg...

I wouldn't be so quick to suspect the inductance of blowing the fuses. Light bulbs have a much lower resistance when cold than when hot. Low voltage lighting may have marginal wiring which will incrrease the warming-up interval. Multiple low voltage bulbs in parallel may be drawing too much of a sur...

Some amplifiers have a multistage scheme with a class D supplying the power to a class AB with just a few volts to spare. The class AB stage cleans the signal. Result? A compromise between class AB quality and class D efficiency.<p>Low THD? Unless stated otherwise, THD is rated at 1kHz. The proof is...

Oops, sorry 'bout that. I looked some terms and found that at 4.5MHz in the gain-bandwidth product, the device stops amplifying. Boy do I feel like a dork! This is partially due to parts that deliberately defeat the amplifier at high frequencies to prevent oscillation. There are opamps made without ...

The MC33070 series (33071, 33072, 33074) have a gain bandwidth product of 4.5 MHz and a slew rate of 13V/uS. If the phase margin doesn't kill your signal, you may get a volt or two.<p>My limited understanding of baluns leads me to believe that they can only be used with narrow bandwidths.

I've got the specs right here. I'll send them to you. Now, if anybody else wants to know, they work down to 4V or so. The output is self centering, and the inputs are limited to +/- 0.4V with respect to the negative supply rail. They'd make lousy opamps with their inputs and outputs being incompatib...

I'm no authority, but I'd put the switching frequency at least one decade higher than the highest frequency I wanted to amplify. The output would then go through a passive low pass filter to reduce the switching artifacts. By having the switching rate that high, you also reduce the aliasing.

I'd actually thought about x-radiating them, but came upon two problems. I don't have a handy source. I don't know if the OTPs have the same EPROM as the reusable ones, just without the window. From a design standpoint it would make sense if EPROM is cheap but windowed ceramic packages are spendy, b...

I obtained a bunch of OTPs that are likely already burned. I was wondering if these can accept instructions from an external memory. Any help is greatly appreciated. Thanks. <p>If you want to know my excuse for having them, I was picking up stuff at the local scrapyard for a buck a pound. I got some...

I once had a stereo that ran on a single AA until it was dead as a doornail. The cell wouldn't even power a clock for more than a few weeks. After a cell is discharged to less than 0.9V with a light load, there's not much left to it. So with a two cell torch, any performance below 1.8V is a bonus. I...

Saturation voltage varies with collector current, base current, temperature, and coffee brand. I could interpret The Semiconductor Data Book (1968, Motorola) on 2N4001s. Several curves are shown, one crosses 0.2V at 100mA Ic and about 2 mA Ib. At 10mA Ic, the curve crosses 0.2V at about 150uA. If yo...

I would guess the last digit to be the multiplier. So 1913 would be 191k. If the fourth digit means something else then the resistonce would read as 190 ohms, not a standard value for three digit resistors. If you measure it with a DMM, that will tell you. Note that this may be a 1% or better resist...

You've got my curiosity up. What sticker things? What company makes them? I only get two channels, KVOS and KVCR. Without seeing one I can only guess that at five bucks apiece they're a reflector to keep power from going where you know there's nothing there to recieve it.