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"12-Volt Modification" [To Get a Clean Composite Picture]

5 messages · 2008-01-06 → 2008-01-07 · Yahoo Group era · View archive on archive.org

Participants: Adam Trionfo, William McBrine, Richard Atkinson, Bill Loguidice

Preserved from the Timex/Sinclair 2068 Yahoo Group (2001–2019), which is no longer online. Text reproduced from the archive.org archive; email addresses masked.

Messages

1. "12-Volt Modification" [To Get a Clean Composite Picture]

Adam Trionfo · Sun, 6 Jan 2008 20:47:

"12-Volt Modification" [To Get a Clean Composite Picture]
By William E. McKelvey

This little modification helps clean-up the picture and the computer runs cooler, especially if you have more than one peripheral attached.

Using proper care, open your beloved 2068.  Using figure #1, find the 78L12 voltage regulator.  It looks like an ordinary transistor (only good for milliamps).  Using great care, remove it.  Make sure the holes are cleaned out.  Now install the 78M12 (larger for more current).  Radio Shack part #276-1771 about $1.20.  Use figure #2, note that it is the BACK of the regulator that should be facing up.

Now for the test.  Move everything away from the circuit board, without the keyboard attached, power up.  Your 2068 should display the copyright notice.  If it does not, POWER OFF IMMEDIATELY!!  Check the orientation of the 7812.  If you have a voltmeter check the input and output.

After all goes well put your 2068 back together and gaze into your nice clean picture.

Inspired by Tim Stoddard
Time Designs Vol. 3 No. 5
_________________________________________________________________
Watch “Cause Effect,” a show about real people making a real difference.
http://im.live.com/Messenger/IM/MTV/?source=text_watchcause

2. Re: [ts2068] "12-Volt Modification" [To Get a Clean Composite Picture]

William McBrine · Mon, 7 Jan 2008 02:31:

On Sun, 6 Jan 2008, Adam Trionfo wrote:

> "12-Volt Modification" [To Get a Clean Composite Picture]
> By William E. McKelvey
>
> This little modification helps clean-up the picture and the computer 
> runs cooler, especially if you have more than one peripheral attached.

I read this back when it was first published in Time Designs, but I never 
tried it. Anyone here do it?

-- 
William McBrine <[email]>

3. Re: [ts2068] "12-Volt Modification" [To Get a Clean Composite Picture]

Richard Atkinson · 07 Jan 2008 07:42:17 +

No, but I would love to see a scanned copy of the article!


On Jan 7 2008, William McBrine wrote:

>On Sun, 6 Jan 2008, Adam Trionfo wrote:
>
>> "12-Volt Modification" [To Get a Clean Composite Picture]
>> By William E. McKelvey
>>
>> This little modification helps clean-up the picture and the computer 
>> runs cooler, especially if you have more than one peripheral attached.
>
>I read this back when it was first published in Time Designs, but I never 
>tried it. Anyone here do it?
>
>

4. RE: [ts2068] "12-Volt Modification" [To Get a Clean Composite Picture]

Bill Loguidice · Mon, 7 Jan 2008 10:45:

Wow, sounds relatively straightforward.  If you have the images, I'd love to
see those too as this is something I'd like to try. 


=================================
Bill Loguidice, Managing Director
Armchair Arcade, Inc.
http://www.armchairarcade.com
A PC Magazine Top 100 Website
=================================


-----Original Message-----
From: [email] [mailto:[email]] On Behalf Of
Adam Trionfo
Sent: Sunday, January 06, 2008 11:47 PM
To: TS 2068 Yahoogroup
Subject: [ts2068] "12-Volt Modification" [To Get a Clean Composite Picture]


"12-Volt Modification" [To Get a Clean Composite Picture] By William E.
McKelvey

This little modification helps clean-up the picture and the computer runs
cooler, especially if you have more than one peripheral attached.

Using proper care, open your beloved 2068.  Using figure #1, find the 78L12
voltage regulator.  It looks like an ordinary transistor (only good for
milliamps).  Using great care, remove it.  Make sure the holes are cleaned
out.  Now install the 78M12 (larger for more current).  Radio Shack part
#276-1771 about $1.20.  Use figure #2, note that it is the BACK of the
regulator that should be facing up.

Now for the test.  Move everything away from the circuit board, without the
keyboard attached, power up.  Your 2068 should display the copyright notice.
If it does not, POWER OFF IMMEDIATELY!!  Check the orientation of the 7812.
If you have a voltmeter check the input and output.

After all goes well put your 2068 back together and gaze into your nice
clean picture.

Inspired by Tim Stoddard
Time Designs Vol. 3 No. 5
_________________________________________________________________
Watch "Cause Effect," a show about real people making a real difference.
http://im.live.com/Messenger/IM/MTV/?source=text_watchcause


Yahoo! Groups Links

5. RE: [ts2068] "12-Volt Modification" [To Get a Clean Composite Picture]

Adam Trionfo · Mon, 7 Jan 2008 09:53:

>>
If you have the images, I'd love to see those too as this is something I'd like to try.
>>

I DO have the jpeg image, but the scan was only 1" high (!).  Maybe Ron can scan it again at 300DPI, B&W and save it as a BMP, TIFF or PNG.  I can convert it to an acrobat file if he sends it to me in this format.

Adam
_________________________________________________________________
Get the power of Windows + Web with the new Windows Live.
http://www.windowslive.com?ocid=TXT_TAGHM_Wave2_powerofwindows_012008

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Video upgrades (composite, RGB, HDMI) · Repair & restoration