CZ1500 ( TS1500 ) composite video mod done

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bola_dor
Posts: 207
Joined: Wed Oct 02, 2019 5:32 am

CZ1500 ( TS1500 ) composite video mod done

Post by bola_dor »

Ok this CZ1500 is a rebranded argentinian TS1500 runing at 50Hz.. .
I've found at least 2 variants in the 1500 main board and at least three variants in RF modulator.. this I have doesn't have any component attached directly to the board inside the modulator box. In fact the modulator has its own metal floor and a board soldered inside.
First attempts trying to preserve the modulator cage and use the "original" connector failed due to some kind ok a coil soldered underneath the output pin that prevented it to work. So if you want to keep the esthetics you need to carefully desolder the modulator from the board and then desolder the tiny board inside, that is hardly soldered from the bottom ...
20200727_234728.jpg
20200727_235211.jpg
As I couldn't find any schematics for this board I followed ULA pin53 and marked in the picture were you could take the signal before it is splitted to the mic output.. as I wanted to use the modulator's box I re positioned the wire near the corner to the hole marked in the second picture.. middle wire brings 5v supply.. and the first wire I just kept it cutted... (this computer doesn't have a channel selector as the TS/CZ1000 so I don't know what does that third wire do) (originally it sintonizes to cannel 2).
20200728_021221.jpg
I used the transistor buffer by 1024MAK at https://www.sinclairzxworld.com/viewtop ... 8749#p8749 with the layout by Dessony https://www.sinclairzxworld.com/viewtop ... 493#p35493.. (thank you both).
20200728_022257.jpg
Nice [K] don't you think?...
ZX80, TK83, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ Spectrum, CZ Spectrum Plus, TS2068, Sinclair QL. TS 1016, TS1040.
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1024MAK
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Location: Looking forward to summer in Somerset, UK...

Re: CZ1500 ( TS1500 ) composite video mod done

Post by 1024MAK »

Yes 8-)

Well done :D 👍

Mark
bola_dor
Posts: 207
Joined: Wed Oct 02, 2019 5:32 am

Re: CZ1500 ( TS1500 ) composite video mod done

Post by bola_dor »

20200728_011215.jpg
Bottom view.
That filter in the corner prevents it to work if you want to use the origuinal output.. and the board is tightly soldered to the box at those four points..
ZX80, TK83, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ Spectrum, CZ Spectrum Plus, TS2068, Sinclair QL. TS 1016, TS1040.
dessony
Posts: 290
Joined: Tue Oct 29, 2013 2:26 pm
Location: Indiana, USA

Re: CZ1500 ( TS1500 ) composite video mod done

Post by dessony »

I concur with Mark (MAK1024)! Well done! :D Thumb up! You are welcomed!
dessony
Posts: 290
Joined: Tue Oct 29, 2013 2:26 pm
Location: Indiana, USA

Re: CZ1500 ( TS1500 ) composite video mod done

Post by dessony »

Mark (1024MAK) and the rest of you,

I found a website on a printed circuit board based on your video transistor buffer amplifier circuit design! :o Just take a look; http://jupiter-ace.co.uk/hardware-KF-video-board.html

Sincerely yours,
DesSony
bola_dor
Posts: 207
Joined: Wed Oct 02, 2019 5:32 am

Re: CZ1500 ( TS1500 ) composite video mod done

Post by bola_dor »

dessony wrote: Sat Aug 15, 2020 1:14 pm Mark (1024MAK) and the rest of you,

I found a website on a printed circuit board based on your video transistor buffer amplifier circuit design! :o Just take a look; http://jupiter-ace.co.uk/hardware-KF-video-board.html

Sincerely yours,
DesSony
It still has Mark's signature on the diagram :o
zx81-video-out.png
ZX80, TK83, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ Spectrum, CZ Spectrum Plus, TS2068, Sinclair QL. TS 1016, TS1040.
Moggy
Posts: 2192
Joined: Wed Jun 18, 2008 2:00 pm

Re: CZ1500 ( TS1500 ) composite video mod done

Post by Moggy »

It would be nice to give credit for other peoples works at least. I know of one person (who I shan't give any publicity to) who has ripped off the ZXpand design though I have yet to see them being offered for sale. :(
mcarlson_sb
Posts: 122
Joined: Wed Apr 08, 2020 4:48 am
Location: San Francisco

Re: CZ1500 ( TS1500 ) composite video mod done

Post by mcarlson_sb »

It looks like miss-attribution rather than no attribution.
The person received the Gerber files from Klaudiusz Fatla and attributes the design to him with a thank you.

Likely the correct attribution got lost in the handoffs.

It would be kind to let them know of the error as they seem to want to give credit correctly.
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