# Electronic theory index

JeeLabs Electronique et Electricite Sourcing electronic components for synth-DIY "Not discontinued, you understand,just on a 52-week lead time." —Dan Mills Hardware Eurorack frames AKA Eurocard frames AKA IEC 60297 sub-racks. supermoduul.com have them cheap. Connectors 0.145" / 3.68 mm pitch Molex 1625 series. Male pins Molex 02-06-2103 (Digi-Key WM1000-ND, Farnell 1079887) Receptacle for male pins, 3-way Molex 03-06-2032 (Digi-Key WM1221-ND, Farnell 1593638) Receptacle for male pins, 4-way Molex 03-06-2042 (Digi-Key WM1222-ND, RS 679-4855) Switches Keyboard switches RS 664-581 (Cherry MX1A-A1NN) does not include a keycap, contrary to what the photo on the web site suggests. Passives Capacitors Dielectrics Potentiometers The most common types of shaft are : round, 1/4" (6.35 mm) ; round, 6 mm; "knurled" a.k.a "serrated" a.k.a. Curves a.k.a. laws a.k.a. tapers : the three most common curves are linear, log (a.k.a. One of the best deals there is on pots is the Alpha RV160 knurled shaft carbons. Some people prefer G&H or Song-Huei's 16-mm carbon pots. Beware of Piher pots. Anti-log pots

Basics: Picking Resistors for LEDs So… you just want to light up an LED. What resistor should you use? Maybe you know the answer, or maybe everyone already assumes that you should know how to get to the answer. Playing with LEDs is supposed to be fun, and figuring out the answers to these questions is actually part of the fun. To get the V in our formula, we need to know two things: the voltage of our power supply, and the voltage of our LEDs. Lets start with a concrete example. LEDs have a characteristic called “forward voltage” which is often shown on the datasheets as Vf. The V in our formula is found by subtracting the LED’s forward voltage from the voltage of the power supply. 3 V (power source) − 1.8 V (LED voltage drop) = 1.2 V In this case, we’re left with 1.2 V which we’ll plug into our V = I × R formula. The next thing we need to know is the I, which is current we want to drive the LED at. Aside: You can always give an LED less current. 1.2 V = 25 mA × R or rephrased: 1.2 V / 25 mA = R and when we solve that we get:

Servo Database - RC Servo Specs and Reviews Normal - Du typon au circuit Imprimé Les Logiciels de CAO:Il en existe une quirielle et tout le monde vous dira que le sien est le meilleur. Bon, pour ma part, j'utilise EDWIN. Pour ceux qui veulent se lancer et être conseillé, je vous livre ma petite expérience. L'inconvénient de EDWIN est qu'il n'est pas si abordable à première vue, il a sa philosophie... Mais quand on a mis 1000 FF ttc, on hésite à le balancer, et quand on l'a compris, il a de très grandes possibilités. Le Routage: Pour les pistes d'alimentation, je les fais à 1mm de large et pour le reste des signaux à 0,7mm, voire 0.5mm Exceptionnellement ( c'est pour la gravure ). La Gravure:Celle-ci est à base de perchlorure de fer ( vendu en granulé et diluer avec de l'eau selon les prescriptions). Si vous utilisez un bac plastique; mettez un gant de chirurgien, prenez la carte (si double Face) et l'agitez doucement dans le bain. Il existe des graveuses à jets pour les plus fortunés. La réponse au persulfate d'ammonium vient d'un internaute: P.

BeagleBoard.org - default IBM1130.org: All about the IBM 1130 Computing System AVR Core :: Overview :: OpenCores Details Name: avr_core Created: Nov 5, 2002 Updated: Feb 4, 2014 SVN Updated: Oct 28, 2012 SVN: Browse Latest version: download Statistics: View Other project properties Category: Processor Language: Development status: Stable Additional info: none WishBone Compliant: No License: Description Microcontroller core compatible with one used in AT mega 103 and written in VHDL. Features • Core features: – 32 x 8 general purpose registers – Twenty three interrupt vectors – Supports up to 128 Kb of program and up to 64 Kb of data memory • Peripheral features: – Programmable UART – Two 8-bit Timer/Counters with separate prescalers and PWM – Eight external interrupt sources – Two parallel ports Status The core was tested with several ASM and C programs.

Wireless Power A few years ago MIT created a system for transferring power wirelessly. They transmitted power over a two-meter distance, from the coil on the left to the coil on the right, where it powers a 60W light bulb. Back in 2006, this was a pretty cool thing. You can only imagine what the implications of something like this would be. Inductive Coupling uses magnetic fields to transfer power. In my research I found, that to transfer power in very complicated. It all starts with the transmitter. The secondary coil has a 0.02 uF capacitor. The primary coil creates a magnetic field, when another coil is placed near it, energy will be induced into it. Be in mind that i could not get a hold of a 0.02uF capacitor so i used two 0.01uF capacitors connected together.

PCB Order | DorkbotPDX Instead of a weekly order, 2 layer circuit boards are now sent to the fab when the panel fills up. This means panels are going out 2 to 3 times a week instead of just once a week. Contents New ordering website! 4 layer orders are now every two weeks. I'm planning another beta 2-layer medium-run order on April 1st, 2013 for people that want at least 150 square inches of their boards. Order Status Keep up to date on the order status updates and to be notified of when the next order will go out: What is this? I've been coordinating a group circuit board order. It's \$5 per square inch for three copies of your two layer design. Your two layer boards will be shipped within about 14 days of the order date. For four layer designs, it's \$10 for three copies. Four layer boards will be mailed within 16 days. Who's eligible Although this was started primarily for the DorkbotPDX community, it's open to any hobbyist anywhere. Your order helps us continue doing it! What you get The Costs Help! Design Rules Enjoy!

Schematics Guide You can see that there are various bits represented by symbols, all connected in various ways. Let’s look at some of the big picture concepts: Left to Right: The first thing to notice is that you read the schematic left-to-right: the input on the left feeds the signal through parts and pathways in the middle to an output on the right. This left-to-right convention is not universal, but it is probably the most common layout for a schematic. Each symbol shows a part number and a part value or type. Connections: The connections between components are shown by lines. Figure 1.2: Various Ways of Depicting Connected Lines In the first example on the left, a dot shows interconnecting lines. Inputs and Outputs For stompbox designs, you almost always have an input and an output. So when you look at a schematic like this, you are dealing with a sort of shorthand that the schematic author used. Figure 2.1: Shorthand Depiction of Inputs and Outputs Figure 2.2: Mapping Shorthand to the Real World Power

Multimeter Help 2 Mike690003, What is your background? How deep an understanding are you looking for? A practical understanding of DC circuits is not difficult and learning to use the multimeter with DC will make perfect sense. Just through simple experimentation, after reading the accompanying manual, you'll learn a lot. AC circuits are a different creature and you'll need additional stuff and either a formal course or a good tutor to do serious work with AC. The best favor I did for myself years ago was take a self-paced, self-tested basic electricity course followed by a basic electronics course in a local trade school. If you're highly self-motivating you might try buying several self-paced texts with tests from a local book store. I'll bet somebody has a web-based, self-paced, basic electricity course. Also, the US Navy (and probably other branches) produce texts for sailors that anybody can buy.

Related: