Custom Cables & Guide to Crimping Dupont PCB Interconnect Cables. Hand making vacuum tubes Part 1. Greg's Slide Rules - Downloadable Manuals. What Can You Do With A Slide Rule? Peter Alfeld, --- Department of Mathematics, --- College of Science --- University of Utah There was a time when electronic calculators did not yet exist.
This did not stop us from doing complicated things, like going to the moon, figuring out the double helix, or designing the Boeing 747. In those days, when we needed to compute things, we used slide rules which are marvelous and beautiful instruments! There are many pages about slide rules on the web, and you can still buy brand new slide rules (40 years old but never used, and still in their factory supplied box) in various places. The purpose of this particular and quite idiosyncratic slide rule page is to describe common scales used on slide rules, and the kind of mathematical expressions that could be evaluated with those scales.
The two images on this page show the two sides of a particular slide rule in my collection. German made slide rules of that time (the late 1960s) usually come with an accessory plastic ruler. Why? . . Turn Your Smartphone Into a Digital Microscope! Slowing 18.104.22.168&c=1&t=42173.03009375. This page details the use of Epson^ InkJet printers with pigment based inks to feed and directly print resist patterns to copper clad printed circuit board stock, ready for etching.
Once you can feed the PCB through the printer for etch resist, you can then feed it back through the printer for solder mask (yes! Several people report that it works quite well!) And for a component "silk-screen". Toner transfer is probably easier to set up for and may be as fast, but direct ink is more precise, allows solder mask and component printing in the appropriate color, and most importantly, finer traces and spaces! And if you admit that a laminator is required for TT, given the prices for old C84^ or R220^ / R280^ printers and the Inks, direct to PCB InkJet printing is cheaper. The secret (discovered by Volkan) is that certain pigment based inks, such as MISPRO Inks^ (#MISPRO42-SET-MK) can be cured with heat to form a very strong resist. Printer Modifications: CD/DVD printing trays.
Process Printing. Electronics Tech Tips. When working with SMT components, a solder-paste silk screen method plus a good baking in a special oven to make the paste flow works best.
But for most of us working on small projects with a limited budget, angel hair solder and a fine tip iron that is ESD safely grounded is the way to go. Those new to SMD components may struggle with "tomb stoning," which happens when one end of the component is soldered and the other end pops up in the air. Here's an easy solution. You will need to use both hands (assuming they do not shake too much) one to hold the Iron and solder and the other to hold down the passive component with a small tool or tooth pick until the iron is removed and the solder has solidified. Schematic Publisher Beta 1.0 RJWSoft Schematic Publisher is a complete schematic capture and publishing system. Schematic Publisher is perfect for students, hobbyists, and professionals. by Ray Wilson. RJWSoft Schematic Publisher is a complete schematic capture and publishing system.
Schematic Publisher is perfect for students, hobbyists, and professionals. Courtesy/Thanks to: Ray Wilson Description: By Ray Wilson: RJWSoft Schematic Publisher is a complete schematic capture and publishing system. #136: What is a dB, dBm, dBu, dBc, etc. on a Spectrum Analyzer? How to think in dB. Signal Synthesis. MT-100.pdf. #48: Basics of Lissajous Patterns on an Oscilloscope. #88: Cheap and simple TDR using an oscilloscope and 74AC14 Schmitt Trigger Inverter. nScope. Cheap and simple TDR using an oscilloscope and 74AC14 Schmitt Trigger Inverter. Measure Capacitors and Inductors with an Oscilloscope and some basic parts. Front End Turns PC Sound Card into High-Speed Sampling Oscilloscope. Part 1 - End, Clock Generator. By Doug Mercer, Analog Devices Various software packages enable the stereo sound card found in a personal computer (PC) to provide oscilloscope-like displays, but the low-sample-rate, high-resolution analog-to-digital converters (ADCs) and ac-coupled front end are optimized for 20 kHz or less of usable bandwidth.
This limited bandwidth can be extended – for repetitive waveforms – by using a sampling front end ahead of the sound card inputs. Subsampling the input waveform with a high-speed sample-and-hold amplifier (SHA) – followed by a low-pass filter to reconstruct and smooth the waveform – effectively stretches the time axis, allowing the PC to be used as a high-speed sampling oscilloscope.
This article describes a front end and probe that provide an appropriate adaptation. Figure 1 shows a schematic for a plug-in attachment that can be used for sampling with typical PC sound cards. The AD783 SHA provides a usable large-signal bandwidth up to a few megahertz. Analog.com.