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  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... microcontroller respond to any video ram change in the ... So no analog circuits, no video ram reading and contention problems ... Simply a transparant innovative digital video cloning in separate ram, with ... that it uses the +12V from the Spectrum expansion bus ...
    Fruitcake Fruitcake May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    followed the instruction video all looks okay but still no -5V or 12V.
    Could my replacemet transistor be the cause of this ?
    Gets real hot very fast.
    Brian Brian June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... the loaded input voltage was 12V or higher.
    There is ... /> (I did do the Composite Video Mod so the modulator is ... is actually -5.01V and 12V is 12.33V , the 5 ...
    Brian Brian June 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    ... is being used by the +12V / -12V / -5V converter circuitry. So the ... analogue signals start to get noisy then eventually stuff starts crashing ...
    1024MAK 1024MAK July 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... /> Now redo the tests for +12V and -5V as shown [URL ... to see what, if any video picture you are getting now ...
    1024MAK 1024MAK July 2014 Hardware
  • Differences between 128k+ and +3 RGB video circuitsHello, Have a bit of a dilema with some strange video results on my +3. Here's my setup: I have a RGB Scart to Component converter that is hooked up…

    ... /> Also there is no composite video on pin 1... Composite sync ... ,
    Yeah, I disabled the 12V on pin 1 so I ... use that pin for composite video.

    I just had ... /> Lights come on but no video or sound.
    Tried replacing ...
    thomas3120 thomas3120 July 2014 Hardware
  • Differences between 128k+ and +3 RGB video circuitsHello, Have a bit of a dilema with some strange video results on my +3. Here's my setup: I have a RGB Scart to Component converter that is hooked up…

    ... /> Lights come on but no video or sound.
    Tried replacing ... is that there is a 12v supply, without that the TEA2000 ...
    guesser guesser July 2014 Hardware
  • + 3 floppy drive clicking then nowtJust picked up a split mint +3 so i expected it to work perfectly but when i switch it on or reset it the floppy clicks about 10/12 times and then no…

    ... some of the video circuits and both +12V and -12V for the serial ...
    1024MAK 1024MAK July 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... IC needing +12v is the LM1889 video encoder, without +12v you'll get ...
    balford balford August 2014 Hardware
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... . I've actually sen that video already, and it's fantastic ... 5v was stepped up to 12v to power the ram?
    Jamesbeat Jamesbeat August 2014 Hardware
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... . I've actually sen that video already, and it's fantastic ... 5v was stepped up to 12v to power the ram?

    The +12V and -5V (and the ~12V "AC") supplies are ... a PSU that outputs +5v, +12V and -5V. And then some ...
    1024MAK 1024MAK August 2014 Hardware
  • Zx Spectrum 128k Toaster RGB pinoutHi all When I use my +2 scart cable on my 128k the picture looks terrible, so I have bought the din plug to make my own. Most sites from what I ca…

    ... it will use the composite video signal you are feeding to ... .

    Pin 8 needs 12V DC to switch to AV ... -0.4V DC = Use composite video input, on pin 20
    Asure Asure August 2014 Hardware
  • Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…

    ... under load it was around 12V, maybe even a little more ... in according to Zorn's video. In spite of leaving a ...
    Renegade Renegade August 2014 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... four capacitors that "decouple" the +12V supply (C5 to C8 on ... LRRM does not use the +12V supply or the -5V supply ... use) and as the only video output was the dreadful UHF ...
    1024MAK 1024MAK August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... and have watched Zorn's video's and have some idea ... have, ie -5, 5 and 12V to run the lower RAM ... measurement of -5, 5 and +12V within say, .1 (NOTE, that ...
    DEATH DEATH August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... and have watched Zorn's video's and have some idea ... have, ie -5, 5 and 12V to run the lower RAM ... measurement of -5, 5 and +12V within say, .1 (NOTE, that ...
    Spekkie Spekkie August 2014 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... as I describe in the video: [URL="https://www.youtube.com ... =0
    -5v = 1770
    +12v = 354
    +5v = 860
    lesoleil70 lesoleil70 September 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... .com/watch?v=IzgCmldm2H4"]this video[/URL] although I'm sure ... .6 / 46.3
    [*][B]12v[/B] - 02.6 / 00.6 ... is significantly lower and the 12v is a little lower.
    video since my meter doesn't ...
    blueowl0708 blueowl0708 September 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... DC converter to supply +12V for the video circuits ([URL="http://uk ...
    1024MAK 1024MAK September 2014 Hardware
  • 48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…

    ... LM1889 video chip.

    C44 is the RAM 4116 +12V.
    3) Decoupling better the 4116 +12V line is the way to ...
    Falco-F8L Falco-F8L September 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... as described in the YouTube video (initial tests..) with my Multimeter ... (0v) 0
    Lower left (12v) 0
    Lower right (5v ... per the instructions in that video and these readings seem to ...
    blueowl0708 blueowl0708 September 2014 Hardware
  • Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…

    ... is being superposed to the video signal.

    Second: these ... power line feeding ULA and video circuitry from high speed signals ... to the ULA, and the +12V supply line to LM1889. Value ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…

    ... noise on the 12v line which gets into the video signal.
    balford balford November 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... , I also think that the +12V are missing. You should measure ... connected) of the video IC LM1889 to check the +12V! (The same ...
    HZJ HZJ November 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... , I also think that the +12V are missing. You should measure ... connected) of the video IC LM1889 to check the +12V! (The same ... /> There is nothing close to 12V on any of the chips ...
    rune rune November 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... idea how you are getting -12V :-o

    If there ... the coil, the voltage on +12V line will either fall to ... C34 (22uF)
    For the +12V use C44 (100uF)
    For ... +12VA use C45 (100uF) (colour video chip supply)

    [B ...
    1024MAK 1024MAK November 2014 Hardware
  • Flickering RGB -> SCART output.Hello all, For my toast rack I have bought a [URL="http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-128K-High-Quality-RGB-Scart-Lead-Video-Cable-TV-Le…

    ... SCART end.

    Comp video ground/Blanking ground is not ... now, I don't see 12v battery packs (plenty of 9v ... /v0/946455647/Portable-font-b-12V-b-font-font-b-18650 ...
    Korinel Korinel November 2014 Hardware
  • Flickering RGB -> SCART output.Hello all, For my toast rack I have bought a [URL="http://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-128K-High-Quality-RGB-Scart-Lead-Video-Cable-TV-Le…

    Yes, the composite video being used as a voltage ... be honest. Whenever the composite video hits a sync, it'll ... to a 12V usually. And remember to disconnect the composite video from ...
    Spirantho Spirantho November 2014 Hardware
  • New Floppy Interface for the +2a/b (black case)Hello everybody! For a long time I wondered about the posibility of adding a FDD to the +2a/b (black). I knew it was possible; All the logic is alre…

    ... ;807039]Hi All :)
    small video not very interesting at all ... ; this drives use also the 12v line so if you are ... have more amps on the 12v line.

    Cheers ...
    BCH BCH December 2014 Hardware
  • RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …

    ... 16K bank and the associated video generation circuitry and I'm ... work with three voltages (+5V, +12v and -5V), or only with ...
    flopping flopping January 2015 Hardware
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