I am trying to remember, did someone give me this link, or did I find it on my own? If I found it, have any of you 'users" visited? What do you think?
Posted by Goodhart 7 years ago
Hello I am looking for a solution to self teach English in Indian villages using a microprocessor based solution for audio together with a paper book. Learning English opens the door to better opportunities and job skills in poor countries. http://simple.wikipedia.org/wiki/Wikipedia:Basic_English_picture_wordlist http://simple.wikipedia.org/wiki/Wikipedia:Basic_English_ordered_wordlist http://simple.wikipedia.org/wiki/Charles_Kay_Ogden http://simple.wikipedia.org/wiki/Basic_English Requirement : 1. Final product should be dirt cheap ($1- $5) 2. Bilingual audio (English and a regional language) toy with buttons. I am a software engineer, can someone guide me what microprocessor or solution set for my need? Plan to develop it as an open source project.
Posted by anonranger 6 years ago
I need a bunch of old CPU microprocessor chips for a craft project. They can be totally non-functional. I'm interested in the physical package, not working electronics. I'll pay postage and agree upon a sales price. However, I'm most interested in older chips, the 486's and early Pentiums (586's). See figure 2 as a guideline. I need a bunch ( > 30) but I'll buy them one at a time if necessary. All are for an Instructable, so it's for a good cause. Any advice for websites that are selling to old chips would also be appreciated. Thanks for any help!
Posted by CrLz 8 years ago
I will get a list of the ones I am considering at the moment soon, and would like suggestions from you all too. Ok, here is my list; I want to pick one of these, OR if someone has a better suggestion....let me hear it: Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices by William Gurstelle Whoosh Boom Splat: The Garage Warrior's Guide to Building Projectile Shooters by William Gurstelle Adventures from the Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons, and the Garage Warriors Who Love Them by William Gurstelle MAKE: Electronics: Learning Through Discovery [Paperback] Charles Platt Getting Started with Arduino (Make: Projects) by Massimo Banzi Practical Arduino: Cool Projects for Open Source Hardware (Technology in Action) by Jonathan Oxer 30 Arduino Projects for the Evil Genius [Paperback] Simon Monk 51 High-Tech Practical Jokes for the Evil Genius by Brad Graham Mechatronics for the Evil Genius: 25 Build-it-Yourself Projects by Newton Braga 123 Robotics Experiments for the Evil Genius (TAB Robotics) by Myke Predko 22 Radio and Receiver Projects for the Evil Genius by Thomas Petruzzellis The Geeks' Guide to World Domination: Be Afraid, Beautiful People [Paperback] Garth Sundem Illustrated Guide to Home Chemistry Experiments: All Lab, No Lecture (DIY Science) by Robert Bruce Thompson Chemical Magic by Leonard A. Ford The Best of Make (Make 75 Projects from the pages of MAKE) by Mark Frauenfelder Theo Gray's Mad Science: Experiments You Can Do At Home - But Probably Shouldn't by Theodore Gray BTW: I have the one pictured, and actually am not pleased with this particular one. Which is why I am being cautious....
Posted by Goodhart 7 years ago
Hello everyone im new to the microprocessor world but trust me im eager to learn! I have been reading every piece of information i can get my hands on about microprocessors. I just wanted to find out what you guys thought the best place to start was for a newbie AVR Possible ? Just wanted some opinions from the best i know if you have any tips or anything also please fell free to post about them thanks so much guys Alex- AKA Zus
Posted by zus 11 years ago
Who judges the contests ? The Sponsors or Instructables ? I ask because I noticed that the Little Bits contest and the Microprocessor contest both have 8 of the same finalists. Does that mean one instructable can win more than one contest at the same time ?
Posted by chris.deen 3 years ago
Hi, I had been working on Arduino and 8085 microprocessor kit. However there are used for low voltage projects. Can someone tell me how to create high voltage projects say creating a vending machine , moving a door, programming for a high voltage ac/dc motor etc. Thanks
Posted by xshanky 5 years ago
I am trying to build a flex sensor gloves that acts as the input and translate the bend of the flex sensors into output in the PC. But it seems i cant get the coding right. I am using the Arduino Leonardo as my microprocessor. Creating atleast 3 input which operate the right, left and up button to be used in a basic car game. Anyone can help me constructing this project? Thankyou. Appreciated.
Posted by AzrilA 2 years ago
We have been developing a pill dispenser that is integrated with your smartphone. We used 3D printed parts and an RFduino microprocessor. This device would allow tracking of medications from the factory to the end user, eliminating couterfeit meds. In addition it would remind you when to take your meds, and notify your doctor or pharmacy via the internet. Watch the video and let me know what you think. https://www.youtube.com/watch?v=5yNBGXBSqLY
Posted by InteMed 3 years ago
Need to know how to do a project for 4-H kids, ages 9-12 to make glowing LED eyes to light up the night on Halloween. Ideally, 4-8 sets of LED's would blink and glow, perhaps controlled by a simple low cost microprocessor and powered by battery. Options include sensor to activate the lights when someone approaches. Since this project is for 4-H kids, low cost and simplicity are important. Arduino would be great, but need help on programming such a project. Thanks,
Posted by phatguppy 6 years ago
You need a separate grouping for this module under Technology This is a Microprocessor running at 80Mhz to 160 Mhz with 512 kB to 4 Mb of program memory It costs $3 and is programmed with various languages compiled to machine hex and uploaded by a variety of programs to run entirely on its own with a 3.3Volt power supply . It connects to your modem , acts as a modem , serves web pages and sends to web pages and a whole lot of other stuff I have not used yet See here in the wiki for more detail http://www.esp8266.com/wiki/doku.php
Posted by tytower 3 years ago
Good evening Sir, Madam, I am currently attempting to build a circuit for a college module that would use vibration data from a dc motor then send it to a microprocessor before transferring the data via Bluetooth to a pc. I have trawled through numerous sites for the correct components to use but. My question is this. Is there a Arduino code that would enable this idea to be successful? Having never written a code I am somewhat stumped and stressed out to the max. I would be grateful of any help or advice you can offer, Thank you in advance for your time over this, Best regards Mark sheldon
Posted by Shaggy74 9 months ago
Sparkfun makes an excellent breakout board for Silicon Laboratories' CP2101 IC. It looks like this board could be used to connect a PC to your microprocessor through a USB port without having to use a MAX232 IC to convert the TTL voltage levels to the serial port voltage levels and then a USB to serial converter. Drivers are available so the PC sees the CP2101 as a COM port so hyper-terminal could be used to communicate with the microP. The 'S' in USB stands for serial, it should would be nice to connect a PC to a microP using only one piece of hardware. Am I right about the CP2101 providing this ability?Any opinions would be appreciated.
Posted by nolte919 9 years ago
Ok so I want to use something like http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/ProductID/92/List/1/Default.aspx?SortField=ProductName,ProductName and http://tinyurl.com/cxlp8jz to create a small system that vibrates when an object is in the way of the detector. To elaborate, Something like https://www.instructables.com/id/Make-an-Attiny13-based-IR-proximity-sensor-for-2/ but using an ultrasonic sensor(for farther range) and a vibrating motor instead of an LED because I am looking to make something for the blind. So how would I build it? I can purchase any parts and just need some instructions like the project above provided. Thanks a lot for any help you can provide. Also , If I need to use a Raspberry Pi, I have one. My Skills? My skills are limited. I know how to solder and work with PCBs, But I do not know how to code a microprocessor. I know that I'd hook it up to an arduino to code it but I can't code. If someone can tell me where to solder the parts and give me a code, I'll be able to do it. Thanks alot for your reply. If someone does this for me, I would be very grateful and might even make some donations to you. :) So to summarize, I need code to program a microprocessor to make a vibrating motor vibrate when the PING senses an object. I also need some sort of a schematic. I will be very grateful and will be sure to give you acknowledgements when I do my project.
Posted by hackery21 5 years ago
So what I'm trying to do is make a massive equalizer that will plug into my computer (or stereo, if anyone has any good ideas on how to tackle that) via USB and serve as an audio visualization on my wall. I'll be using a 4x8 piece of plywood to mount 450 LEDs to ( 30 columns of 15), building a frame, then screwing a 4x8 sheet of frosty plexiglass to, then another 4x8 sheet of plywood with 2 inch holes drilled out in the same 30x15 arrangement as the LEDs (do you follow? lol).I'm pretty handy, so the drilling and everything isn't my problem. My problem is trying to figure out how to power 450 LEDs, put each on a I/O switch, and control those switches with my computer (I've read there are winamp plugins to deal with similar things, I wonder if they'll work with what I'm trying to do...)I'd prefer to use USB to power my contraption, but unless I figure out how to utilize PlusPower, I don't think that's viable, and I don't really feel like burning out my power supply either.These are the LEDs I'm using.I'm considering wiring each column in parallel and using microprocessors as switches, but I haven't really gotten that far in my thought process, and I'm not sure if that's the best way to handle it anyways (plus I'd like to try to save some money by controlling it all through USB instead of investing in microprocessors).So I've rambled off about as much info as I think is useful for those of you willing to help me with the logistics, if you have any questions at all feel free to email me at email@example.comThanks in advance,Zach
Posted by Slinger 11 years ago
I have been intrested in optical computer for a while but found them rather expensive to build so I tried to look for cheaper ways to build some key features like the gates. The basic idea is to use solar cells that power a led. For and OR-Port you use solarcells where it is enough that one of the side gets light to make the led burn. To make and AND-port, you can put a resitor in between so that it really needs the power form both channel sot make a led burn. For a NOT-port you put an invertor in, so that when it burns it gives no signal, and wheren it does not receive light it burns this because of a battery it caries. A NOT-port is almost like a led-throwie.I do hav emore but wanted to know if this would be a good place or not, or if someones intrested in hearing on how to build a full optical computer, still basic, but almost completly optical, or if it would be better to post this on the microprocessor group at the opencourseware of the MIT ?
Posted by Floris Vermeir 11 years ago
I have an old rc car that i wanted to make into a robot for my graduation project. I want it to be able to sense a possible threat (wall, tree, person, other car) and be able to drive without help of a remote control. I have a NXT Intelligent Brick (meant for Legos) it has a 32-bit ARM7 microprocessor. Support for Bluetooth wireless communication. 1 USB 2.0 port. 4 input ports. 3 output ports. Powered by 6 AA (1.5v) Batteries, not included, or lithium Rechargeable Battery (#9798), sold separately. Up to three NXT Bricks can be connected at the same time; however, you can only communicate with one NXT Brick at a time. This is the individual component, and does not include any sensors, motors, cords, software or other accessories; for the complete LEGOÃÂ® MINDSTORMSÃÂ® NXT set, please see item #8527. Do you think it is possible to get it to work? Also if you have ideas please tell me.
Posted by Pat Sowers 11 years ago
Hello everybody, Simple question: does the Arduino YUN support the same DROPBOX functionalities as my laptop? Basically, I need to download data from the SD card of my Arduino Yun to my application server. But the internet connection of my Arduino is not very stable. How I want it to work: 1. I have a sketch that writes data on a TXT file to my SD card every 10 minutes 2. I want to install Dropbox on my Arduino Yun 3. Then, whenever the Yun is connected, it will synchronize all the files from the SD Card with my Dropbox folder on my server. That would happen (I guess) in the background, without my Arduino needing to run a sketch. To do that, I think I need drobox to run ‘in the background’ on my Arduino microprocessor. Did anyone do this before? Thanks. What does NOT work: Initially, I used the "LogToDropbox" sketch inserted in the "Datalogging to Dropbox with Arduino Yun" tutorial at the following link: https://www.instructables.com/id/Datalogging-to-Dropbox-with-Arduino-Yun/ in order to ‘actively’ upload files to my Dropbox app console from my SD card with an internet connection. But if , my Arduino Yun is losing the internet connection, it is impossible to upload the files created during the downtime to my Dropbox app console. These files are stored on the SD card plugged on the Yun during this time interval, but not synchronized.
Posted by DELETED_jay97430 3 years ago
My skills include: 2D computer graphics, woodworking, Arduino, Linux, programming, building flying RC models, cooking, designing objects, repurposing/modding/customizing/recycling, managing. What I'd like to make for someone: Something useful or beautiful or both, with a modern aesthetics. I'd be willing to make this size gift package for someone (choose all that apply): S, M. I'd be willing to receive a smaller or larger size gift package from someone than the one I make for someone else: No. S, M, possibly XS or XXS. What I like: Science and technology, aircrafts and spaceships, jazz, prog rock, modern art, geometry, Vasarely, Giacometti, Scandinavian architecture, J.S. Bach, Babylon 5, Babel 17, Blade Runner, Back to the Future, A. Nothomb, Asimov, Iain Banks, D. Simmons, J. Haldeman, Python language, Motorola microprocessors, Unicode, hiking. What I don't like: Kitsch. Raisins. Inefficiency. Hypocrisy. Rudeness. Bad or lack of design. I absolutely can't have: Meat products (or containing). Type of thing I'd love to receive: Something incredibly fun or nice, that is also incredibly useful or incredibly useless. Something I like, but could not make. Something hand- and mind- made. An object , an image, or an idea. Would you be willing to ship to an address outside your own country? Yes. Confirm that are at least 18 years old or, if not, that you have the approval of a parent or guardian: I confirm both.
Posted by laxap 8 years ago
Hi all, I've spent a great deal of time reading up on microprocessors so I can get involved with such an activity. However, I have found great difficulties in finding a high performance RISC processor. Being in the UK, I can only find one or two providers with a limited range of processors, and that isn't just RISC ones. I also get a little swamped looking at manufacturer's websites. It's very strange they all seem to boast an architecture with XYZ Mhz of max performance, but on their spec tables there is no processor with this maxed figure shown and a lot of entries /fields are empty making 99% of their processors unknown in spec. Highly annoy and useless. I'm not looking for anything special in regards to added features to the processor (I find most of it unnecessary and as a means to charge more money, apologizes for my ignorance in this;)), just a basic chip that can process a lot (thus higher Mhz) is all im after. lower power consumption are a great/big bonus for me though. If anyone can point me in the right direction, that would be great. I've found many processors (for example, arm cortex-a by sounds of things is perfect: Over 1ghz of performance. Only problem no one seems to be making them; to the public like us anyway. Looking for microcontrollers seems to be quite a difficult task, if anyone has resources, sites or retailer /suppliers (UK for me, but feel free to post other countries for other user's benefit) or anything that would help it would be appreciated. I dont want you to do my dirty work, just guide me in the right direction. On another subject, at least with arm processors I've read the speed rating (for example 500mhz), if you x3 it'll give the "real speed" due to that 3 phase of processing it does. making 500mhz more like <1.5ghz. of course, it isn't exactly x3, the point im making the processing performance is better due to the 3 phases. thank you for your time.
Posted by lukus001 10 years ago
Hi all, I've spent a great deal of time reading up on microprocessors so I can get involved with such an activity. However, I have found great difficulties in finding a high performance RISC processor. Being in the UK, I can only find one or two providers with a limited range of processors, and that isn't just RISC ones. I also get a little swamped looking at manufacturer's websites. It's very strange they all seem to boast an architecture with XYZ Mhz of max performance, but on their spec tables there is no processor with this maxed figure shown and a lot of entries /fields are empty making 99% of their processors unknown in spec. Highly annoy and useless. I'm not looking for anything special in regards to added features to the processor (I find most of it unnecessary and as a means to charge more money, apologizes for my ignorance in this;)), just a basic chip that can process a lot (thus higher Mhz) is all im after. lower power consumption are a great/big bonus for me though. Of course, prices does matter (not Â£300) but i am aware what im looking at isnt a $1 chip If anyone can point me in the right direction, that would be great. I've found many processors (for example, arm cortex-a by sounds of things is perfect: Over 1ghz of performance. Only problem no one seems to be making them; to the public like us anyway. Looking for microcontrollers seems to be quite a difficult task, if anyone has resources, sites or retailer /suppliers (UK for me, but feel free to post other countries for other user's benefit) or anything that would help it would be appreciated. I dont want you to do my dirty work, just guide me in the right direction. On another subject, at least with arm processors I've read the speed rating; for example 500mhz, if you x3 it'll give the "real speed" due to that 3 phase of processing it does. making 500mhz more like <1.5ghz. of course, it isn't exactly x3, the point i'm making the processing performance is better due to the 3 phases? thank you for your time.
Posted by lukus001 10 years ago
More information at www.nottinghack.org.uk Arduino-Sundae - An all day workshop from 11am 3rd October 2010 Station Street Nottingham. £40 - Includes Oomlout Arduino Budget Pack. An introduction to Arduino for beginners. Step by step introduction to working with the Arduino prototyping board and an introduction to microprocessors in general. In addition to on-screen step-by-step instruction, experienced hackers will be there to help you. Includes an Arduino Kit or bring your own for a discount. A day filled with Arduino using the www.oomlout.co.uk Budget Arduino Kit (included in the cost of the workshop or buy and bring your own for a discount). Schedule for the day: 11:00 - Settle in get your kit open it up and have a play around meet others etc 11:30 - "Hello World" Arduino 101 basic Arduino introduction including setting up external LEDs, Motors and sensors etc 12:30 - Show n' Tell - Arduino-Projects-Show-Case a number of projects including - Drawbot, Arduino Tank, 3D Printer RepRap, Addressable lights and many more (bring one too if you like) will be available for inspiration, discussion and tuition. 13:30 Lunch (bring your own or pop to a local place we are very central) 1400 - Use the pool of parts to try your own project. Helpful and experienced hackers want to help you learn more and will circulate to answer your questions. At Nottinghack there are no stupid questions. 16:00 - Close (but your welcome to stay until 18:00 then we'll probably go for a coffee or beer). Have a think about what you'd like to learn. We have a few suggested projects to help people who aren't sure and there will be lots or electronic bits n' bobs to help you get stuck in. Make sure you bring your laptop and download the Arduino Open Source environment and install it before the workshop http://www.arduino.cc... The cost of the workshop is only £40 including the Oomlout Budget Pack for Arduino and a day of tuition and hands on help. If you already have an Arduino and the required equipment the cost is £20 only.
Posted by ChickenGrylls 7 years ago
Seeing other forms of making interactive throwies, eg using microchips impresses me.However i think it is important that we try parts of the B.E.A.M philosophyhttp://en.wikipedia.org/wiki/BEAM_roboticsNamely keeping things simple, and avoiding the use of microprocessor.The component of a interactive throwie is that it has1. Power storage2. Trigger3. Circuit4. LED5. (optional) Power collection of radiant energy.I like to see more suggestion on ways we can address each issues.But to kick start the issue, can you see if my idea is feasible.essentially for my prototype not-yet throwie, I used a circuit from http://unconventional-airsoft.com/2003/11/16/momentary-fan-switch/#more-21to create a throwie that on sensing motion, doesn't flicker but turns on for a while.By ensuring that i use few and simple componants, i hope to keep cost per throwing down.Unfortunately my problem is that using a resistor to keep the capacitor from draining too fast from the base, actually decreases the voltage drop to an unacceptable level at the led.On my end it is unsolvable for the moment. Maybe you can work out how to make a cheap throwie, that can still do these functions or more.Any ideas how to solve this?Other Ideas for throwies1.Open and attach a switch to a barometer, to have a air presser passive trigger.2. A leave shaped pad with two conductors that do not touch, to act as rain sensors. (Resistance increase when leaf dries)3. Is sensitive to infrared radiation from side, so that the throwie is trigger-able by other activated throwies. (As well infrared devices)4. Has a short loop of coil to recharged capacitors, by outside induction.5. If activated rarely, uses a tiny single solar cell to charge capacitor.6. Has a hook to be easily collected for recycling. (Using a simple loop of wire on a pole [Like a dog catcher pole] )7. A single thermistors in series with led.8. A tricolour LED, and a Two light resistor. One LDR acts to sense if it is day an night, if night a low power light is activated. Only when an object strays near, and reflect light into another LDR, does the throwie get triggered at all.9. A throwie triggered by vibration.10. A throwie that responds to radio waves.
Posted by akimbo m 10 years ago
So far I was lucky and never got a lightning strike or other power failure to induce high voltages into my house and equippment. But over the time I got several requests from friends to take a look at things after literally all connected electronics in their house got fried. In some cases there is only a total write off as due to a lack of surge protectors inside all unwanted juice made it's way into vital components. Like a brand new Samsung TV where the replacement of the power board was the only option - which makes you wonder... But in other cases, like microwaves, induction cooktops, computers and such I had some good success with the repairs. Guess it comes down to purs luck on both sides, power surge was not too bad and simple components on the input side failed quickly enough to prevent damage to microprocessors or other sensitive parts. Right now I have an induction cooktop here again that failed after a mains transformer in street blew up during a thunderstorm. I can tell it was bad as everything in the area of fried parts has a vaporizsed metal film on the surface and not much is left that was a surge protection. I cleaned all up, replaced the varistors and missing parts of the traces on the circuit board but the cooktop is not performing the way it should anymore :( At some stage during cooking it turns off with a meaningless error code stating the input voltage was out of bounds. So my next attempt was to literally remove every single component from the filter and power supply board to measure for any possible connections between the traces. By doing so I noticed several points where I had a quite high but measurable resistance in areas where there should be none. Mostly on the direct input side where the varistors tried to save things. So I used my Dremel in a tin drill press to cut the circuit board aourd the affect areas (where possible with a drill, otherwise with a thin grinding disk).. Sure enough I was greeted by charcoal colored dust in several areas. After removing all material until the dust was "clean" tried again and this time all seems to work fine. I would like to use this topic to offer some help and guidance in case you have devices that suffered a severe power surge of some sort. Many of us either have no insurance to replace those items or even if you do the device might be expensive enough to try a repair despite getting it replaced. Trust me, even it went up in smoke there is still a chance to fix it in some cases and if proper protective circuits were in place the repair could as cheap as a few Dollars for replacement parts. To get useful advice the following things should be included in your request: Some clear pictures showing a close up of the affected parts - if there is visibale damage to be seen. A brief description of what happened, e.g.: lightning strike directly into the house or outside power lines, generator or inverter failure or simply that the power company stuffed up and your entire street was affected. Of course you will need the means to take the device apart for investigation and also some basic soldering skills or somehow how has and can assist you. But if you are up to the challange I am willing to help if possible.
Posted by Downunder35m 2 years ago
1 Power Supply Circuit: During the circuit board repair process, power supply part should be inspected at the first hand and then come to the other part. +/-5V, Power supply failure can occur under below several situation: (1) NO power supply voltage or power supply voltage is deficiency, NC system is often used +/-5V, +/-12V, +/-15V and +/-24V, a few of them use +3.3V, and the varied or unstable voltage of power supply will cause the system working impropery; (2) Use voltmeter to test the voltage of power supply, and the result show is normal. Voltage waveform detected by oscillograph has shown the existence of big ripple. This situation maybe caused by open circuit of Filtering capacitance, bad rectifier diode or cold soldering, but sometimes it could be caused by an overloaded component which has been brokendown and damaged by power. (3) System can run properly when it is just being opened, after a while of operating, the voltage begin to drop off. This is usually caused by voltage stabilizing circuit and large power triode. (4) The voltage decrease accompany with temperature increase maybe cause by component cold soldering, it is electrical connection can be affected negatively when the temperature high up. (5) NO power supply voltage or supply voltage decreases significantly will cause the system to interrupt or stop working, this fault can be detected and spotted easier. (6) When the capacity of power supply load drop off or filter circuit become invalid, it will cause the system halt suddenly, this situation which is very difficult to justify can bring damage to the equipment and facility even get personnel wound. 2 Clock Circuit: Clock circuit mainly exist on the systematic motherboard, it is the foundation of large-scale integrated circuit system through which it can work, it can generate the constant square signal in the circuit base upon the crystal oscillator (commonly known as crystal), Once the crystal oscillator stop working, it is same as the heart of human being stop beating, the whole system will fall into the status of paralyzed, only after crystal can work under normal condition, the systematic circuit can operate under the command of CPU according to the frequency of crystal. The number and frequency of the crystal could be different due to the variety of numerical control system, but generally will at least one crystal, different clock frequencies required by the other circuit can be solved by frequency dividing circuit or other crystal. Crystal possess a higher rate of failure or damage, below are some malfuntions of crystal: (1) Leakage: Use multimeter and switch to P*10K level to test it, if the resistance is infinite, then it can be viewed as normal; (2) Internal OPEN CIRCUIT: Value of resistance is infinite tested by Use multimeter, can fail to generate oscillating pulse in the circuit; (3) Alternative crystal: Due to the transformation of crytal will cause its internal parameter change which can only be detected by osillagraph or cymometer. Although the crystal can still has oscillation, but the clock frequency is deviated from its nominal value, and the still existing oscillation pulse can’t make system circuit work properly due to the value of oscillation is wrong. Only cymometer can test its tolerance now. (4) In clock circuit, the both ends of crystal would be connected to ground by one ceramic capacitor value range from several picofarads to tens picofarads, failure of the clock circuit result from this capacitor leakage, deterioration is also more common. The best tool to test whether the crystal is good or bad could be oscillagraph or cymometer, multimeter is very difficult to detect the root cause. 3 Reset Circuit Reset circuit also exist in the circuit system of motherboard, it is unique set of large-scale digital integrated circuit. Microprocessor and interface circuit are all possess reset terminal. Reset pulse generate by reset circuit will clear the progam counter, force CPU recall the orginal files from the memory, execute initiation process on all the controller chips, system will occurs the phenomenon of disorder or crash as a result of faulty reset circuit, the method of using cymometer to illustrate the reset pulse is turn on/off power supply repeatly, observe and record the pulse value at the right moment of power supply on/off since it should be the normal square wave-form. If there is no existence of reset pulse, all the resistor, capacitor and transistor in the reset circuit should be detected. The reset terminal of integrated circuit should be regular low or high electrical level, or else, it is probably the malfunctional reset circuit or damaged integrated circuit.http://www.circuit-engineering.com
Posted by circuiteng 7 years ago