cd-rom tricks Quote: Here you go: Not just straight so easy. It can increase the max torque achieved by the motor. The torqque will be square to to the stator lenght. Torque easy tranclates to magnetic force between stator and rotor. In example in twice longer stator you can get twice more MF at the same saturation level but at the same time you can use longer magnets in the twice longer rotor. So how to bring it back to the original Kv (and original rpm)? Isn't it slick? RysiuM
Sci.Electronics FAQ: Repair: Pinouts FAQ Contents: 7.3) Misc / Power Power Connector Male Speaker Connector Turbo Indicator Connector pin assignment pin assignment pin assignment 1 +12V 1 -Speaker 1 +5V 2 +12V return 2 [key] 2 -High Speed 3 +5V return 3 GND 3 +5V 4 +5V 4 +Speaker +5V AT LED Power and Key Lock AT Backup Battery pin assignment pin assignment 1 LED power 1 Batt+ 2 GND 2 [key] 3 GND 3 GND 4 Key Switch 4 GND 5 GND Motherboard Power Connectors pin P8 assignment pin P9 assignment 1 Power Good 1 GND 2 +5v (or N.C.) 2 GND 3 +12v 3 -5v 4 -12v 4 +5v 5 GND 5 +5v 6 GND 6 +5v MIDI 5pin DIN MIDI In MIDI Out pin assignment pin assignment 1 N/C 1 N/C 2 N/C 2 GND 3 N/C 3 N/C 4 Current Src 4 Current Sink 5 Current Sink 5 Current Src 7.5) Floppy 7.6) Game Port Game Port DB15-Female pin assignment pin assignment 1 +5V DC 2 Button 4 (A_PB1) 3 Position 0(A_X) 4 GND 5 GND 6 Position 1 (A_Y) 7 Button 5(A_PB2) 8 +5V DC 9 +5V DC 10 Button 6 (B_PB1) 11 Position 2(B_X) 12 GND 13 Position 3(B_Y) 14 Button 7 (B_PB2) 15 +5V DC 7.7) Serial Port
Rotational Encoder from old CD motor Rotational Encoder from old CD motor Last updated: September 22, 2010 The spindle motors used in CD-ROM drives often (always?) contain 3 Hall-sensors. These sensors are used by the motor controller to determine the position of the axle. First try to find the connections between the Hall sensors and the motor controller. The Hall sensors are connected in parallel. By feeding the Hall signals into a LM339 you get 3 TTL compatible signals that indicate the axle position. The Hall sensors are permanently connected to Vcc and GND. Rotating the motor gives the following output pattern: 001, 000, 010, 110, 110, 101. A software solution. With microcontroller An attempt to interface the encoder directly to 3 ADC channels of an ATtiny13 microcontroller failed. In a second attempt the outputs of the (already existing) LM339 where connected to the ATtiny13. After the required code change, this worked at first try. AVR programming avrdude -v -P /dev/ppi0 -c stk200 -p t13 -U lfuse:w:0x7a:m
Network Taps Next: ConclusionUp: Receive-only UTP cables and Previous: Receive-only cables Subsections The alternative. TAP stands for Test Access Port. Obviously, Network Taps are more expensive than making your own receive-only cables, but they have more advantages. There are several companies that develop these products. It is interesting to note that all Tap manufacturers claim their copper Taps are fail-safe (no disruption to the link on powerloss). Schemes The diagram 11 describes two ways to represent the Tap connection scheme. A Tap captures network traffic in both directions and sends it to a monitoring device, such an IDS or a statistics traffic generator. To build a Tap like that is trivial. More solutions for analyze traffic with Taps are discussed later on section 4.3 `Implementation Examples'. Adaptive Taps Adaptive Taps are designed to make signal conversions, in addition to capturing traffic. Regeneration Taps Aggregation Taps Taps versus Span (mirror) Ports Traffic integrity.
Virtapiiri © Helsingin yliopiston opettajankoulutuslaitos Kun taskulampun kytkintä painetaan, lamppu syttyy. Kytkimen painaminen yhdistää johtimella hehkulampun navat pariston napoihin. Havaitun ilmiön selittäminen edellyttää paristossa ja johtimessa tapahtuvien ilmiöiden ominaisuuksiin perehtymistä. Taskulampun lampun syttymistä voidaan verrata salaman välähdykseen. Salaman edellytyksenä on, että ukkospilven alaosalla ja maan pinnalla on erimerkkinen sähkövaraus. Kun taskulampun lamppu hehkuu, paristossa tapahtuu kemiallisia reaktioita. Kun lamppu hehkuu, pariston ja lampun yhdistävissä johtimissa kulkee sähkövirta. Hehkulanka hehkuu, kun langan läpi virtaa sähkövirta. Kun virtapiiri suljetaan, pariston jännite saa aikaan sähkövirran virtapiirissä. Komponentti ja virtapiiri Kun pariston navat yhdistetään kahdella johtimella lampun napoihin, lamppu alkaa hehkua (vasen kuva). Paristo on komponentti, jossa tapahtuvat kemialliset reaktiot synnyttää napojen väliin jännitteen (katso tarkemmin). 5. 6. 7.
the 5-in-1 network admin's cable ethernet / crossover / modem / null modem / Cisco console featured in the premiere edition of Make There is nothing worse than showing up for an on-site visit without the correct cable you need for a job. For quite some time I've been carrying a single CAT5 ethernet cable in my laptop bag along with "the world's shortest crossover cable" and an RJ45 coupler. But after putting together four simple custom adapters, I now have an ethernet cable, a crossover ethernet cable, a modem cable, a null modem cable, and a Cisco console cable all by carrying around just one standard ethernet cable. Do you find yourself toting several of these cables everywhere you go? Here's how to make your own: RJ45 pin 8 has to connect to both 1 and 6 on the DB9 connector. Here's how to use it: DB9/RJ45 - ethernet - coupler - Cisco adapter Remember that the Cisco adapter is not reversible. Notes: This solution is somewhat similar to the Yost wiring standard which I have long found to be quite useful. Extras:
Karin Kotisivut - Elektroniikka Maadoitus ja maadoittaminen lienevät meille kaikille erittäin tuttuja sanoja, ja asioina nuo lienevät jokapäiväisiä suurimmalle osalle kansakunnastamme. Pureudutaanpa siis asiaan tarkemmin ja selvitellään että miksi niitä maadoituksia tehdään, kuinka niitä tehdään, ketkä niitä tekevät, ja mitä kaikkea onkaan mahdollista, mitä erinäisimmin tavoin, maadoittaa. Ennen kuin lähdemme todella syvällisesti pureutumaan maadoittamisen filosofiaan ja tarkkoihin yksityiskohtiin, seurailkaamme yhden päivän ajan, Maanselällä asuvan Matti Maavirran elämää, jotta tietäisimme, kuinka jokapäiväisestä asiasta maadoittamisessa onkaan kysymys. Päivä on perjantai, ja alkaa tavanomaiseen tapaan herätyskellon soinnilla kello 7.30. Sitten keittiöön ja vedenkeitin pöydältä mukaan. Vedenkeittimen täyttämisen jälkeen olikin sitten vuorossa päivän ensimmäinen paksusähköpuolen maadoituskytkentä, eli vedenkeittimen liitosjohdon pistokkeen työntäminen keittimestä löytyvään kojeliittimeen. Virtapiiri syntyy.
Color LCD - Breakout Board Replacement: LCD-11062. The new version of this board has a larger inductor to better support screen compatibility. This page is for reference only. Description: Created for the Sinister 7 Tutorial, this breakout board for the popular Nokia 6100 Knock-off color LCD has an improved backlight driver circuit (boosts to 7V) , plus we give you a tri-color status LED and 2 pushbuttons, all accessed through one 12-pin 0.1" spaced header. Slightly less versatile than the previous version yet slightly more functional, this breakout is set up for serial communication to the display. This board comes with Nokia 6100 display attached and stand-offs as photographed. Note: Pins 8 and 9 on the Nokia LCD connector will be connected with a solder bridge. Pin connections: +Vbat and the 3.3V input can be driven from the same regulated 3.3V source, but the device will draw more current than if the +Vbat input was driven from a higher source voltage. Dimensions: 1.5"x2.5"
RS232 Specifications and standard RS232 specifications, introduction Communication as defined in the RS232 standard is an asynchronous serial communication method. The word serial means, that the information is sent one bit at a time. Asynchronous tells us that the information is not sent in predefined time slots. RS232 bit streams The RS232 standard describes a communication method where information is sent bit by bit on a physical channel. With synchronous communication, a clock or trigger signal must be present which indicates the beginning of each transfer. Data bits are sent with a predefined frequency, the baud rate. With RS232, the line voltage level can have two states. Start bit RS232 defines an asynchronous type of communication. Data bits Directly following the start bit, the data bits are sent. Parity bit For error detecting purposes, it is possible to add an extra bit to the data word automatically. Stop bits Suppose that the receiver has missed the start bit because of noise on the transmission line. Voltages