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<1…15161718192021…34>
  • 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. …

    ... (they are connected) of the video IC LM1889 to check the ... you can find at the capacitor C45. )If there is that ...
    rune rune November 2014 Hardware
  • 128k Toastrack Composite Video output confusion!Hi everyone. Ok, so I have a couple of 48k's that I have performed Wombles fantastic composite mod on. They work great here in Canada on my big scre…

    ... .com/Generic-Scart-Converter-1080P-Video/dp/B00DI6HTOI/ref=sr_1_8?ie ... .com/Generic-Scart-Converter-1080P-Video/dp/B00DI6HTOI/ref=sr_1_8?ie ... use of a resistor and capacitor fitted on the TEA2000 on ...
    RSwipeCA RSwipeCA December 2014 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... a direct connection from video input to video output bypassing the ... transistor with a 100uF electrolytic capacitor.

    The transistor ... closer to 0V. The capacitor removes the DC portion of ... signal. Normally, only the capacitor should be enough.
    mcleod_ideafix mcleod_ideafix January 2015 Hardware
  • Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…

    ... to be in the analogue video circuitry.

    Are the ... the area of the analogue video circuitry have not been changed ... that a semi-bad electrolytic capacitor can cause.

    Having ... that there is a non-capacitor fault causing these symptoms. But ...
    1024MAK 1024MAK January 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... direct connection from video input to video output bypassing the ... transistor with a 100uF electrolytic capacitor.

    The ... signal. Normally, only the capacitor should be enough.[/QUOTE]
    capacitor bypassing the modulator. I ...
    RSwipeCA RSwipeCA February 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    The capacitor mod makes the composite output non-standard, composite video isn't ... all) TVs have a coupling capacitor in them anyway. Personally I ...
    RobeeeJay RobeeeJay February 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... to 100uF) allows the composite video signal through.

    ... buffer amplifier stage before the capacitor (transistor or suitable chip). ... a bodge really. In most video amplifier designs, you want a ... get one of the two video modules from Sell My Retro ...
    1024MAK 1024MAK February 2015 Hardware
  • ZX81 Composite Mod<p>I've done a simple composite mod to my Issue 3&nbsp;ZX81 following a basic schematic I found on one of the ZX81 forums. Mod consists of a BC547, 1…

    Try adding a capacitor in series with the output ... a DC component on their video input. Also it'll reduce ... have to work as hard. Capacitor value in the order of ...
    RetroTechie RetroTechie June 2015 Hardware
  • Newbie Hardware QuestionsI just recently aquired my first Spectrum, a +2, and I'm in the process of getting acquainted with it. Being a newbie I had some questions, which …

    ... as 47µH and a capacitor with 27pF or 68µH ... capacitance of the capacitor leads to sharper edges in video picture.
    video signal that is not synchron ...
    ingo ingo July 2015 Hardware
  • Composite Video Mod Capacitor ValueCouldn't find any thread where this has been asked before but I'm not convinced the search in this forum is the best...:) Due to the recent retire…

    ... However, if no capacitor is fitted, the video output signal from the ... the capacitor will limit low frequency parts of the video signal ... connect a 100nF ceramic capacitor in parallel with the ... peek voltage across) the capacitor and the voltage rating of ...
    1024MAK 1024MAK July 2015 Hardware
  • not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …

    ... IC or a dead electrolytic capacitor is overloading one of them ... might find some of the video presentations I've published helpful ...
    Zorn Zorn July 2015 Hardware
  • ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…

    ... gear, got a 100uF capacitor and done the video mod properly. What ...
    lunarul lunarul August 2015 Hardware
  • Some downloads fail meI want download the schema of the Spectrum +2A and I can not because appears a user and password request in all links of "SCHEMATICS, MANUALS AND TEC…

    ... , +2B and on +3 boards: Capacitor C24 links the sound from ... chip IC10 (MC1376) to the video colour encoder chip IC9 (TEA2000 ... not produce the best quality video or sound.

    [b ...
    1024MAK 1024MAK November 2015 Hardware
  • Video Problem - Spectrum 48kYet again I come seeking help.... Can anyone point me in the direction of anything that explains the video generation circuit on the Spectrum? I'v…

    ... feed to a 100uF electrolytic capacitor (+ on the transistor side) and ... other side to a composite video input on your TV / monitor ...
    1024MAK 1024MAK November 2015 Hardware
  • ZX Spectrum+ video ? red on green problemThis is my first post on the forum, so let me introduce myself. I am retired for several years. For 30 years I have been a fan of the ZX Spectrum. I …

    ... ="Boleslaw Jamroz;815917"]Modification “S-Video" removed the phenomenon of "dot ... of roller near the S-Video socket on the picture number ... the choice of a 1uF capacitor on the path of chrominance ...
    Renegade Renegade November 2015 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…

    ... that voltage levels in composite video signal drop (=darker), not a ... regulators (or -converters) and in video encoder / ULA supply lines. A ... small value of series capacitor in composite video output. 47uF may work ...
    RetroTechie RetroTechie December 2015 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…

    ... that voltage levels in composite video signal drop (=darker), not ... (or -converters) and in video encoder / ULA supply lines. ... been modified, this 22uF capacitor will not have a silk ... small value of series capacitor in composite video output. 47uF may ...
    1024MAK 1024MAK December 2015 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…

    ... small value of series capacitor in composite video output. 47uF may work ... this also apply to s-video output?
    If not, what ... reduce horizontal banding in s-video?
    Renegade Renegade December 2015 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…

    ... small value of series capacitor in composite video output. 47uF may work ... this also apply to s-video output?
    If not, ... reduce horizontal banding in s-video?[/quote]
    Yes, the ... done by fitting a 100uF capacitor here.

    [b][i ...
    1024MAK 1024MAK December 2015 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…

    ... small value of series capacitor in composite video output. 47uF may work ... reduce horizontal banding in s-video?[/quote]
    Yes, the ... done by fitting a 100uF capacitor here.

    [b ... I tried fitting a 220uF capacitor on the luminace output and ...
    Renegade Renegade December 2015 Hardware
  • Harlequin Rev. G - Composite video problem.What I'm about to describe I'm not experiencing it by myself, so the probable answer to any "have you tested this or that" question is no, I don't, b…

    One of the user affected with this problem has succesfully swapped c25 with a 27pF capacitor and the composite video has color at last. I'll report back when more of the affected users perform this fix to be sure this value works for all of them.
    GroovyDrifter GroovyDrifter February 2016 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…

    ... this signal via a new capacitor between IC11, pin 4 and ... pointlessly present on the composite video output. Monitor should now produce ... done? I've watched the video but the end result picture ...
    MatGubbins MatGubbins March 2016 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... the yellow jack the composite video on the ZX-Uno to ... the big resistor in the capacitor discharge tool did generate a ... am just puzzled why the capacitor discharge resistor gave me a ...
    harriusherbartio harriusherbartio July 2016 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... it is wired for comp video input. I will retrieve the ... they both buzzed on the Capacitor Tool resistor showing continuity .However ...
    harriusherbartio harriusherbartio July 2016 Hardware
  • A focus on old TVs for 48k spectrums The old 48k Spectrum is becoming harder to use "display wise" in its original state. This thread is about retaining originality and not going down …

    As the video signal frequency differs a factor ... a 47uF (or 68uF) electrolytic capacitor between 'VID IN' of the ... where the '-' wire of the capacitor can enter, so the (axial ... ) capacitor itself can stay outside.
    ...
    roko roko July 2016 Hardware
  • A focus on old TVs for 48k spectrums The old 48k Spectrum is becoming harder to use "display wise" in its original state. This thread is about retaining originality and not going down …

    ... 100uF 16V electrolytic capacitor between this and the composite video connection has ...
    1024MAK 1024MAK July 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... PC, I ca watch the video. I was using a iPad ... may need to use a capacitor and temporary reset switch in ...
    1024MAK 1024MAK August 2016 Hardware
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... a previous owner removed the capacitor that mixes the sound into ... and interferes with the composite video signal for no good reason ...
    1024MAK 1024MAK October 2016 Hardware
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... a previous owner removed the capacitor that mixes the sound into ... and interferes with the composite video signal for no good reason ...
    britain4 britain4 October 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    ... a bit saturated in your video.
    This might be caused ... the DC offset at the video signal and is finally a ... solution than inserting an electrolytic capacitor.

    If the signal ...
    ingo ingo November 2016 Hardware
<1…15161718192021…34>

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