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  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... the ground layout around the video output and to add one ... a switching regulator. Using a 12V power supply or a original ...
    ingo ingo August 2012 Hardware
  • Just bought a Spectrum+. Doesn't work. Red bars on screen.Hi all, Something of a noob here. Having recently been on holiday, I came across a Spectrum+ in a box, with a collection of games in a shop, and, af…

    ... do not separate the generated +12V from the '+9V' input, so ... gets a voltage in the 12V range anyway.[/QUOTE]

    12V (its nominal voltage is 15V ... will also notice a dimmered video signal
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... and runs off the noisy 12v supply rather than a single ...
    guesser guesser August 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... in series with the 12V supply to the video circuitry, so it ...
    Zorn Zorn October 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... ]check voltages![/B] (+5, -5, +12V, place to check is on ... image (which needs lower RAM + video encoder to work), but DO ...
    RetroTechie RetroTechie October 2012 Hardware
  • Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…

    ... cheap, and as +12V was needed for the video circuit anyway...

    Supplying the 5V regulator with +12V ...
    1024MAK 1024MAK October 2012 Hardware
  • my first 48kHi I have just got my first 48k and I can't keep it tuned in. And when it is its not very clear. Moving text and switching to black and white. some …

    ... noise makes it into the video signal. As always, if it ... already suggested, taking a composite video signal rather than going via ... crosstalk and lead to a noisy picture, so check it isn ...
    Zorn Zorn November 2012 Hardware
  • Issue 2 video problemHello all, Need some help with an issue 2 board that I 'm trying to restore. I've replaced all the electrolytic capacitors, changed the voltage regu…

    Is the 12V dc supply to the video section at 12V? (+/- 10%)
    Also ... on all transistors in the video circuits are > 0.6V ... up the fault finding of video circuit faults.

    [B ...
    1024MAK 1024MAK December 2012 Hardware
  • +2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…

    I just did the S-Video mod on my +2. ... from this point to +12V analog made a new potential ... pull down resistor.

    12V * 820/(820+3300) = 2.388V ... signals worked fine in S-Video on my Sony television. The ... and cross colour in S-Video. Cross luma on the ...
    rga24 rga24 December 2012 Hardware
  • +2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…

    ... on pin 5 of the video socket in place of ... 5, thus the whole S-Video style signal is available from ... two points to tap the 12V analog supply voltage. These ... to +12V for pins 1 and 5 of the video socket in ... />
    One of the +12V sources is used for the ...
    rga24 rga24 December 2012 Hardware
  • Adding IDE to your Spectrum +2 A/B (or +3)Hello my fellow [B]WoS'ers[/B] [B]This is a shared thread with [url]www.amibay.com[/url] which you can [URL="http://www.amibay.com/showthread.php?t=…

    ... need power rails note the +12v (top) and +5v (bottom) ... code right.... red = +5v, yellow = +12v and black = Ground

    12v juice... so ensure the device ... keep kids inside..... and playing video games.... its the only way ...
    Zetr0 Zetr0 January 2013 Hardware
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... page 6 of Ben's "Video fixes
    for all ZX ... on this picture is the 12V, but in the original way ... 2N3904 is mounted, the
    12V is connected to the emitter ... ), the emitter is conected on 12V if the transistor is installed ...
    gtsamour gtsamour January 2013 Hardware
  • ahh..sooo close :) Spec128k+ RGB on LCD monitor helpHello, Was trying out RGB on my 128k+ and a Samsung Syncmaster 204 lcd monitor. Tried this monitor with a Genesis/Megadrive and a SNES and works real…

    ... , but the text suggests using 12V from the Keypad / RS232 connector ... ohm resistor between CVBS and Video In, the other does not ... 't it better to use 12V from the Keypad / RS232 connector ... /hobby/vanmezelf/ZX Spectrum 128K video fixes and video cables.pdf[/url]
    bverstee bverstee February 2013 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... follower) that handles the composite video. F.i. when the ... /> The synchronisation pulses in composite video are negative, so below '0V ... course....

    Consider the 'video' part of the signal not ... reach the LM1889 over the +12V and +5V lines.
    < ...
    roko roko March 2013 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... The synchronisation pulses in composite video are negative, so below ... =roko;690299]Consider the 'video' part of the signal not ... the LM1889 over the +12V and +5V lines.[/QUOTE ... is coming from the +12V line, I think the ... I haven't checked the +12V.

    I ...
    RobeeeJay RobeeeJay March 2013 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... ][/U]

    As the +12V supply comes from a switch ... ).

    [U][B]Composite Video Signal[/B][/U]

    1024MAK 1024MAK March 2013 Hardware
  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... lower RAM (and 12V for part of the video circuitry). They generally ...
    Zorn Zorn April 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... +2 after power on non video on Rf or CVBS but ... the ZX i found that 12V aren't present... the ZTX650 ...
    Falco-F8L Falco-F8L April 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    ... /> Even with dead supplies at +12V and -5V rails, there should ... work if there's no 12V). I can't see that ... first to make a composite video mod and stop using the ... you are currently using a video composite output, then I'm ...
    mcleod_ideafix mcleod_ideafix May 2013 Hardware
  • CapacitorsSorry, another question... I've done a bit of looking around, although after a couple of beers this may not have been as systematic as usual, but I …

    ... also appear briefly in the video I made and that you ... involved with the production of 12V in the DC-DC converter ...
    Zorn Zorn May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... connected to the board a +12V +5v (both 2A) generic PSU ... (without it of course) and +12V on the cathode of the ... the machine boot and video modulator work and video composite too..
    emilen72 emilen72 May 2013 Hardware
  • Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…

    ... Spectrum there is no composite video at the edge connector at ... should work as you had video signal of Spectrum menu.
    12V (about 11 till 13 V ...
    ingo ingo May 2013 Hardware
  • Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…

    Ahh, so you are now flushed with pride now that your Toastrack has a good +12V dc supply flowing to the video circuits :-)

    Good work that man :-)


    [B][I]Mark[/I][/B]
    1024MAK 1024MAK May 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... .com/watch?v=IzgCmldm2H4"]this video presentation[/URL] that I made ... to be working as the video circuitry requires the 12V it produces.
    Zorn Zorn June 2013 Hardware
  • PlusDlite prototype/first batch is here![IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_143221.jpg[/IMG] [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_153930.jpg[/IMG] …

    ... : indeed caused by a bad video cable.


    Booting ... supplies and even one 5+12V supply to feed the ZX ...
    bverstee bverstee June 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... />
    C44 is on the 12V output of the DC-DC ... converter circuit. Is 12V present at the lower RAM ... ? A missing 12V power rail will affect the video signal and will ...
    Zorn Zorn July 2013 Hardware
  • Transistors 101Hi, Im a complete novice when it comes to electronics and would appreciate any help that can be given. Im replacing the transistor that sits on to…

    No +12V (or a very low voltage) to the video section will prevent ... , +5V (from 7805 voltage regulator), +12V and -5V generated by the ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... feed a regulated, current limited +12V to the junction of R8 ... TEA2000 and the +12V feed to the RGB / Video port.

    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... an idea if the +12V supply line has a short ... br />
    Using your 12V regulated PSU, connect it to ... TEA2000 and the +12V feed to the RGB / Video port. Use ... are using the RGB / video out DIN connector, check if ... out here, as the +12V goes to this connector via ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... />
    QUOTE
    "Using your 12V regulated PSU, connect it to ... TEA2000 and the +12V feed to the RGB / Video port. Use a ... /> END QUOTE

    Connected 12V to R8/L1 .
    It ... and we have a perfect video -menu presented - in black & ...
    DenisM DenisM August 2013 Hardware
<1…15161718192021…34>

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