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16  General Chat / High Score - Are you the best ... around? / Re: POLL: Do you want a highscore section on this forum ? on: February 14, 2010, 09:18:34 PM
Hagen must have used a time machine to set his high score, in 1864!  Grin
17  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 13, 2010, 02:26:17 PM
Yeah, it's probably best you start a new thread where we can discuss caps. Smiley

As for the amps, I had a load of Pioneers, 2 Marantz and 2 Akai. Sold all of them except 1 Pioneer, because I didn't repair it, and after all those years, it's still not repaired oppps. It only needs two new transistors in the preamp stage.
I also had numerous tape decks (the ones with reels), cassette decks, turntables,... (These were various brands: Sony, Pioneer, Technics, Thorens, Nakamichi, Akai,...)
Almost all was sold when I was 19 because I wanted a car.... Undecided
18  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 13, 2010, 11:30:45 AM
To put a little weight on the other side of the scale, I have also been thinking about replacing caps (elco's, a much better word IMHO) on vector PCB's and monitors with hi-end audio quality one's.

I know this may sound stupid, but at least the amplification stages of vector monitors are very comparable to audio amps.
However, I checked the PCB vector stages and they actually don't have any (or not many) elco's at all....
The monitors do have some of course....

If it would (further) improve the picture quality it's definitely worth trying...

In my amplifier restores I mostly used the Matsushita/Panasonic FC series (for the elco's). These have low impedance and thus they are great for audio purposes, and they are affordable too Smiley. Unless you want to upgrade to the really expensive audio specialty brands of course. I looked into these for my restores but I figured the price was too high, take maybe 5x more expensive for 1.5x quality gain. I was still on a student budget so it had to be relatively cheap Smiley Although I still would buy the FC series now if I could it all over again. I'm very happy with their performance. If it was a tube amp I would go for the expensive stuff.

I also replaced a lot of polyester caps with polypropylene. I know these don't dry out like elco's, but they have more gentle characteristics. Which is great for audio Smiley
19  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 13, 2010, 12:18:15 AM
I've been looking at that tester too in the past, but where/how can you buy it?

Yeah, like you say, the most common problem with caps is the esr that increases (sometimes dramaticaly) over time. I tend to buy low esr caps most of the time when I'm replacing old ones, because there isn't much price diff with the regular ones these days.
20  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 12, 2010, 09:43:59 PM
"Quantity available: 3"
Hmm, how old are they?

At least that's what Bob said, I suppose, what do I know?  Grin Wink

It's of course possible that Bob had them special made, I'm not questioning what he told you Wink. It just seems weird that he had them special made when they already exist.

The caps from digikey are not going to be very old, and they are still in production (so you can order a brand new batch from the factory Grin). Digikey just doesn't stock up much on those uncommon caps. I ordered a few of those large can capacitors a while ago (not that type I linked to) for those old amp restores and the oldest cap was about 8 months old (date code on cap).
There are more types to be found but they are going to be smaller than 50mm diameter mostly, because over time all discrete components get smaller due to new materials, production process,..
21  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 12, 2010, 08:06:39 PM
And it's really nasty when they explode, all that messy stuff everywhere lol


I highly doubt Bob Roberts has these specially manufactured though, electrolytic capacitors are widely available in every size, capacity, voltage, terminal type.... Even those ancient 50F/500V capacitors for those ancient tube electronics are still manufactured today. I bought a couple of them a few weeks ago, expensive MFers Sad

Here is one 27000F/50V / 50 mm diameter / screw type terminal for example:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=565-3324-ND

I also used these types regularly when I was restoring 70's audio amplifiers.
22  General Chat / Technical Area / Re: Atari power brick US -> EU on: February 12, 2010, 07:19:08 PM
It's supposed to be 27000F/15V, but according to Bob Roberts anything between 27000F and 35000F is OK. You can also buy a higher voltage one, never lower!
23  General Chat / 'Business' Area : Buy/Sell/Trade / Re: WTB: Atari Basketball PCB on: February 11, 2010, 11:07:57 PM
By the way, did we de-rail this thread ?
Yes.

In fact reproducing a game with a real cpu, ram and fpga/cpld would be a bootleg....

I think we need to join forces and start developing bootlegs Tongue
24  General Chat / 'Business' Area : Buy/Sell/Trade / Re: WTB: Atari Basketball PCB on: February 11, 2010, 09:27:00 PM
Aha, so you just have to add a couple more 74's and you're done building your Dominos FPGA Wink Wink Wink

Indeed no emulation is the key for me with this technology. And instant on, like a real PCB....I really don't like arcade games that need to boot....sorry.

Well, you've got me thinking....because of the economic crisis I only have to work every other week now, so an arcade related project would be cool. Smiley
So I looked up the Dominoes manual and there is a microprocessor page in the schematics. I don't know what cpu it is, the pages are hard to read (scan quality). It's part 90-6009. I really would like to give a game reproduction a try, but not with a microprocessor to start with Smiley.
25  General Chat / 'Business' Area : Buy/Sell/Trade / Re: WTB: Atari Basketball PCB on: February 11, 2010, 08:46:47 PM
So, since you don't have a cpu with your B/W board, it's still no emulation Smiley (that was my point)

For my final test (eindwerk) at school I had to program an FPGA. Only simple logic stuff though, first I had to design a logic circuit, then design a pcb for it with 74xx and design a pcb with one FPGA. Was a cool project to learn what FPGA's are all about. Although since it was only logic stuff the same could have easily been achieved with a CPLD.
26  General Chat / Arcade Lifestyle / Re: Another arcade doc. on: February 11, 2010, 08:14:06 PM
Koeie Poep

 lol
27  General Chat / 'Business' Area : Buy/Sell/Trade / Re: WTB: Atari Basketball PCB on: February 11, 2010, 08:11:46 PM
How difficult can it be to put that handful of TTL chips in a FPGA ?

Pffft, that wouldn't be the same, would it? Like using Mame...

No, actually it would be EXACTLY the same. An FPGA is like 1000 TTL chips in one, the number of cels varies with the type of chip of course. So you program every TTL chip from the original board + the traces between them into one FPGA. That means you get 100% the same game (there is no CPU), no emulation like mame is involved Smiley. I guess you would only need a few transistors, capacitors and resistors for the audio and video amplification etc...
28  General Chat / Dragon's Lair / Space Ace / Re: dragons lair stepdown converter on: February 10, 2010, 11:46:26 PM
The 250W on the converter means it CAN deliver UP TO 250W, so it only delivers the power you need. For instance, if you need 130W total, the converter is going to deliver only 130W.
29  General Chat / Arcade Lifestyle / Re: :: Workshop :: @!#?@!? [Q*Bert of course] ;-) on: February 10, 2010, 11:42:26 PM
Brilliant !  again to the same store with a complete cab ! LOL!

Or maybe I should learn how to create a bar code that would display '@!#?@!?' on the cash register!  Tongue

That would be something like this   Cheesy

The only thing the barcode generator gives an error here is this symbol "#"  Grin

So........is this an EAN code or UPC? lol Wink
30  General Chat / Arcade Lifestyle / Re: :: Workshop :: @!#?@!? [Q*Bert of course] ;-) on: February 10, 2010, 09:17:44 PM
YES, if this is possible, you should definitely try that next time! Grin
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