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Diseño del circuito y PCB acabados..
Ya falta menos...
Agujerear, soldar montar...
Llevo unas semanas sin afotar... :( A ver si acabo pronto.
Let's find some JTAG pins.
Red: address / data line bus (interface to Broadway)
Blue: RAM / flash
Yellow: DI?
Cyan: USB
Purple: AV
Laser stripped conductors
Overmold provides additional strain relief to minimize pistoning
Automated welding for unmatched consistency
Welding results in less dielectric shrink-back than soldering
Typical PC motherboard about the 1998 era with an Intel Pentium II processor. The processor of this computer contains 7.5 million transistors on a single chip. This is a Micro-Star International motherboard.
From Dirty PCBs dot com. Dirt cheap, better than adequate quality, simple ordering, good web feedback, any shape you like, the panelising that enables and dirt cheap, yeah really dirt cheap... Which means you give your imagination a chance for minimal risk. One of these panelised boards was more of a rushed test than the other and having received them in the flesh I can instantly see how I might have done it better. But the total order price was $25 for 10 10x10cm of board, which I fit 2 boards into panelised. So it was $12.50 to experiment, get 10 functioning boards and a powerful experiential lesson. That's the real value of dirt cheap. Then there's the other 10 boards that I couldn't be happier with... for $12.50. My next order is already in...
My second printed board, this one much simpler-- a relay circuit for triggering via a microcontroller. 3-pin female header, L-R:
1) Signal
2) +
3) -
I'm happy to provide the complete EAGLE file if anybody is interested.
This uses a Futurlec JQC-3FF-05 relay, and I didn't drill the NC output pad-- just figured I should have a trace for it (?).
I think I turned around this board in under an hour, from the PDF. I'll never use perfboard again, if I don't have to!
UPDATE: re: mightohm's question: the process for making the pcb:
* switch layers in Eagle to display only the top layer, pads, and dimensions,
* "print" and save to PDF,
* in Photoshop, open the PDF at 1200dpi,
* run an action to fill the pad holes and make B+W,
* print with Samsung ML1740:
* 8.5x11 piece of paper with a glossy catalog page taped to it (Sur La Table fwiw),
* printer output set to "transparency" to (hopefully) get more toner,
* cut the pattern out of the middle of the page
* iron onto a slightly over-sized piece of single-sided copper-clad:
* lightly sand with ~220 grit (finest I had around) and cleaned with acetone,
* pre-heated board with iron (piece of paper in between) for ~30s,
* CAREFULLY drop the glossy printout onto the copper, then just as CAREFULLY drop on another (blank) piece of paper, then a paper towel on top of that,
* put the iron on and let it sit for ~30s,
* gently move the iron around, applying pressure for ~1 min,
* remove the paper towel and keep ironing on the paper over the glossy printout for another ~2-10 min (?), maybe moving it around.
* let board cool for a minute,
* drop board into a container with water,
* after a minute, pull paper off and gently scrub off the rest of the pulp with a toothbrush,
* fill gaps/dropouts with an etch-resistant pen,
* drop into ferric chloride bath for a few minutes, checking periodically,
* remove the board and drop immediately into a container with water,
* rinse,
* drill,
* solder,
* circuit check-- pretty much involves cutting solder and scraping down to the fiberglass where solder blobs bridge traces/pads.
* Bob == uncle.
The Prop Plug and Prop Clip each provide a USB-to-serial port connection that is convenient for microcontroller programming and communication. These tiny devices are capable of asynchronous communication at up to 3 M baud with both 3.3-volt and 5.0-volt devices such as the Propeller and BASIC Stamp. The Prop Plug slips onto a 4-pin, 0.1" spaced header, allowing both PCB's and breadboards to provide in-circuit programming capability. Use the Prop Clip if programming with fewer components via a PCB edge connector is desired.
Bought an old Nixie tube frequency counter from the late sixties recently and just had to take a shot of each cards inside of it. There were at least 20 cards in there. BTW, the frequency counter still works!
Dépannage informatique Genève pour particuliers, indépendants et PME.
Cours d'informatique Genève
Création site web
Création e-boutique
Référencement web
Marketing 2.0
Gestion de campagnes publicitaires
Ex Go-ahead London now Plymouth City Bus Volvo B7TL seen in Plymouth at Derrys cross roundabout. Unknown date. Copyright of Western National man 2011. Not to be sold or copyed without permission.
Doska elektroniky PCB pre pevný disk. Cena za 1ks.
Vhodné na opravy,diagnostoku, záchranu dát z poškodených diskov a pre foreznýchšpecialistov.
* WDC 1995, WDC96 62–602110–062, WD10C38-YU
* WDC 1996,621011A 3080T12CXP6 7442, WD61C30A-YK
* MAXTOR 301193100 VEGA III, A6DAA0605913CTH ER
* SG22580–101 REV.A, SAB-M3005–8D, 23400278–002
* WDC1995, WDC95 62–602200–002, WD10C38-YV
* WDC 1996, WDC97 62–602208–064,WD61C30A-YK
* ATHENA II/POKER, D1FBB, 2006205 CMY, Poker C6 040108200
*SG20109–100 REV.A, SAB-M3005–8D, 23400278–002
* 66G9718 D43406-A,442898C, 84G6094
* WDC 1995, WDC95 62–602110–002, WDC10C38-YV
* WDC 1996,WDC97 62–602210–076, 2.1GB
* QUANTUM 540S TB54S341 REV 04-B S590K, Quantum14–102092–05
* QUANTUM 800–08–97, EMMM1 94V-0, GMSC 6.406 01992
*MAXTOR 301306100 MIL.TNT V-3, B7DEA, 30017739
* WDC 1996, WDC9662–602220–072, V7142, 2.1GB
* MT1199E 0223-BRS, B041–00139A REV.00
This PCB is part of the announcement tape deck. To the right are the record/playback head and erase head for this unit. The pink wire ending in a solder tag connects to an insulated part of one of the tape guides, it is thus grounded by a switching foil on the tape at the appropriate time. The PCB contains the switches used to record new announcements on this tape, a DIN socket for the microphone. FETs to select the opening or closing announcement (just below the switches), a bias/erase oscillator (the 2 metal-can transistors) and the microphone preamplifier
I somehow managed to switched the DC socket polarity when routing, so initially got some scary smoke and the 10Ω resistors got really really hot really really fast (glad I used 1/2 watt!). Anyway, fixed that then tested the source voltage on the MOSFETs…setting the bias using the trimmpots to half the MOSFET sink voltage. Voltage offset of the audio outputs measured within range, so I hooked up my Sennheiser HD550s and had a listen. Even with the shitty caps I used for this prototype the sound is amazing!
Can't wait to make a couple of small mods to the PCB layout and stick my good caps in :)
Ok.
Some of the chips are;
The Atmel AtmegaA8 - it's a basic CPU.
I quote from the above linked site: 8-Kbyte self-programming Flash Program Memory, 1-Kbyte SRAM, 512 Byte EEPROM, 6 or 8 Channel 10-bit A/D-converter. Up to 16 MIPS throughput at 16 Mhz. 2.7 - 5.5 Volt operation.
Cool Audio V1000. Now, CoolAudio, it seems, is a chip foundry that Behringer bought out a few years ago. They seem to just copy other people's chips. For example, the above page on the V1000 says that it's compatible with the ALS3201. This chip is made by Wavefront Semi. They are Alesis' chip foundry arm. The power behind the Andromeda and many of their awesome recent projects is that they've got a chip foundry at their disposal.
So, basically, you can use this PCB as a dev kit for the Alesis chip, but it's a quarter of the price! It's already got ins, outs, controls and whatever else.
Yes, you can circuit bend this board, too, quite a bit, but, some of the results aren't too great
Doska elektroniky PCB pre pevný disk. Cena za 1ks.
Vhodné na opravy,diagnostoku, záchranu dát z poškodených diskov a pre foreznýchšpecialistov.
* WDC 1995, WDC96 62–602110–062, WD10C38-YU
* WDC 1996,621011A 3080T12CXP6 7442, WD61C30A-YK
* MAXTOR 301193100 VEGA III, A6DAA0605913CTH ER
* SG22580–101 REV.A, SAB-M3005–8D, 23400278–002
* WDC1995, WDC95 62–602200–002, WD10C38-YV
* WDC 1996, WDC97 62–602208–064,WD61C30A-YK
* ATHENA II/POKER, D1FBB, 2006205 CMY, Poker C6 040108200
*SG20109–100 REV.A, SAB-M3005–8D, 23400278–002
* 66G9718 D43406-A,442898C, 84G6094
* WDC 1995, WDC95 62–602110–002, WDC10C38-YV
* WDC 1996,WDC97 62–602210–076, 2.1GB
* QUANTUM 540S TB54S341 REV 04-B S590K, Quantum14–102092–05
* QUANTUM 800–08–97, EMMM1 94V-0, GMSC 6.406 01992
*MAXTOR 301306100 MIL.TNT V-3, B7DEA, 30017739
* WDC 1996, WDC9662–602220–072, V7142, 2.1GB
* MT1199E 0223-BRS, B041–00139A REV.00
A warning label on a drum of chemicals. The drum apparently contains Polychlorinated Biphenyls, PCBs. Found at the former Flintkote site in Lockport, NY.
I had dropped this, cracking the carbon tracks in the three front panel mounted potentiometers. This was a before picture, just in case I forgot where the 1kOhm linear went. In the end I couldn't get hold of a 1k pot, so it has a 10k linear instead.