White noise and PCB flux cleaner.

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poink
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Re: White noise and PCB flux cleaner.

Post by poink » Tue Dec 06, 2016 6:46 am

flynnjs wrote:Martin, nice addition to my various other "cleaned up" schecmatics. Did you do that?
I've usually seen that one attributed to Jason Tribbeck.

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MartinB
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Re: White noise and PCB flux cleaner.

Post by MartinB » Tue Dec 06, 2016 6:47 am

Jason wrote:Martin, nice addition to my various other "cleaned up" schematics. Did you do that?
Do you know if is it raster only, or is it in vector or CAD format?
No, unless my memory is fading badly, I'm sure it's not my work but sadly, I can't even remember where it came from to credit the author. I've had it for years and have been using it in the background to create a PDF searchable version where all the annotations are duplicated in hidden text boxes so you can find components etc. by name or type. Predictably of course, a project that's by no means finished.... :roll: :wink: !

It never occurred to me this version wasn't generally available or I'd have submitted it sooner.

Edit : There you go, coincident posting by poink - Jason Tribbeck!

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1024MAK
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Re: White noise and PCB flux cleaner.

Post by 1024MAK » Tue Dec 06, 2016 7:37 am

matabhaine wrote:Can these capacitors be had from retroclinic? Thanx.
You best ask him. It's likely he has some, if not, he can get them. But then again, I have the 10uF in stock, I'm likely to have the other two as well, but would have to check. Later today I'll try to find time to check.

Mark

PS don't confuse me (Mark) with Mark of Retroclinic :lol:

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IanS
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Re: White noise and PCB flux cleaner.

Post by IanS » Tue Dec 06, 2016 10:36 am

flynnjs wrote:Martin, nice addition to my various other "cleaned up" schecmatics. Did you do that?
Do you know if is it raster only, or is it in vector or CAD format?
Looks to be the one listed here - http://8bs.com/insides.htm as "A redrawn diagram by J.Tribbeck."

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Re: White noise and PCB flux cleaner.

Post by matabhaine » Wed Dec 07, 2016 8:26 am

@mark thanx for the reply.

Kind regards
Matt.

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Re: White noise and PCB flux cleaner.

Post by matabhaine » Sat Dec 10, 2016 7:28 am

When I press the BREAK key, the sound from the speaker dampens and the caps lock LED goes on. Is this normal?

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Matt.

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1024MAK
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Re: White noise and PCB flux cleaner.

Post by 1024MAK » Sat Dec 10, 2016 9:04 am

The BREAK key is also the reset key, so the CPU is halted and reset, as are various other chips that are connected to the reset line. When you release the BREAK key, the computer then restarts from reset. The OS can tell if it was a power on reset, or a reset due to the BREAK key having been used. If the former it does a "cold" start, otherwise it does a "warm" restart. The OS defaults to caps lock on at restart.

During the time that the CPU is halted during reset, there is no CPU lead activity on the address and data busses, so less digital electrical noise, hence less pick-up by the audio circuits that feed the speaker.

Mark

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Re: White noise and PCB flux cleaner.

Post by matabhaine » Sun Dec 11, 2016 6:19 am

@mark thanx again, that has put my mind at rest.

Kind regards
Matt.

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flynnjs
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Re: White noise and PCB flux cleaner.

Post by flynnjs » Mon Jan 02, 2017 10:20 am

poink wrote:
flynnjs wrote:Martin, nice addition to my various other "cleaned up" schecmatics. Did you do that?
I've usually seen that one attributed to Jason Tribbeck.
I've spotted an error that has been introduced in the cleanup process. Pin 4 & 5 of IC89 are both labelled TXC.

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