Search found 518 matches

by 1024MAK
Sun Jul 29, 2018 4:17 pm
Forum: Hardware
Topic: Video issue over rf. Changes with reset
Replies: 7
Views: 409

Re: Video issue over rf. Changes with reset

The RF output comes from the modulator. All the modulator does is to put the composite video signal onto a high frequency carrier. The main problem with the modulators and hence the RF output, is that these are analogue devices which use a capacitor-inductor to form the high frequency oscillator, so...
by 1024MAK
Sun Jul 01, 2018 10:54 am
Forum: Software & Programming
Topic: Unique original firmware from the Sinclair Archives
Replies: 10
Views: 739

Re: Unique original firmware from the Sinclair Archives

While on the subject of the early QL machines that were supplied with a dongle, does anyone have any good quality photos of the the populated board that they used? Or know of web site(s) that have such photos?

Mark
by 1024MAK
Sat Jun 30, 2018 10:29 pm
Forum: Software & Programming
Topic: Unique original firmware from the Sinclair Archives
Replies: 10
Views: 739

Re: Unique original firmware from the Sinclair Archives

Where is that clapping emoji :?:

Well done Urs 8-) :D

Mark
by 1024MAK
Wed Jun 13, 2018 3:04 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 21
Views: 1345

Re: Today I Received...

Have you tried it out yet? :) No :( Got to get a grip on the garden and other outdoor jobs while the weather is good... Got the solar system on the shed partly functional, and the 12V lights in the shed and the 'sun house' next to the shed installed, connected up and working. Tested them last night...
by 1024MAK
Tue Jun 12, 2018 7:49 pm
Forum: Hardware
Topic: Q68 Order Process
Replies: 97
Views: 8412

Re: Q68 Order Process

My Q68 arrived today :D https://qlforum.co.uk/download/file.php?id=1867 Q68 case front https://qlforum.co.uk/download/file.php?id=1866 Q68 case rear Thanks Derek https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org....
by 1024MAK
Tue Jun 12, 2018 7:44 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 21
Views: 1345

Re: Today I Received...

My Q68 arrived today :D IMG_7241.JPG IMG_7240.JPG Thanks Derek https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif Mark
by 1024MAK
Fri Jun 08, 2018 10:46 am
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 21
Views: 1345

Re: Today I Received...

martyn_hill wrote:Just loving the Gigatron!

I build it last weekend at an Acorn meet up. Pictures of it just after I powered it up are here :D

Mark
by 1024MAK
Fri Jun 08, 2018 10:41 am
Forum: General QL Chat
Topic: Hello? Anyone here?
Replies: 8
Views: 583

Re: Hello? Anyone here?

I was busy building this:
IMG_7224.JPG
Gigatron
IMG_7223.JPG
Gigatron

This was at an Acorn meet up.
There are full resolution 'photos (and the lower resolution 'photos) on my Flickr account here.

Mark
by 1024MAK
Thu Jun 07, 2018 11:27 pm
Forum: The Off-Topic Section
Topic: Need electronic expert advice for a project
Replies: 13
Views: 543

Re: Need electronic expert advice for a project

This makes more sense now on the switch side of things. The switch enable will trigger that lower of the 3 comparator's (there are 4 in the 339 package), and that in turn will switch Q6 on, allowing the SW pin to rise towards +12V, it would normally be dragged to 0.6V by the bias resistor to -12V a...
by 1024MAK
Thu Jun 07, 2018 9:36 pm
Forum: The Off-Topic Section
Topic: Fire
Replies: 18
Views: 716

Re: Fire

Hi Dilwyn,

Glad to hear that you are okay, and from the sounds of what you say, hopefully there is no, or minimal damage to your home.

If the items in your loft were wrapped up, or in sealed boxes, they may be okay.

Mark

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