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Search Again :: Adv Search 1000 results in 0.012s
<1…14151617181920…34>
  • TEA2000 mod for better CVBS quality?Has anyone tried this before? :confused: [URL=http://s1063.photobucket.com/user/JRT480/media/Evenmoreperfect_zpse2505ab9.jpg.html][IMG]http://i1063…

    ... coil and a 47pF ceramic capacitor gives the best compromise between ... high frequency parts of the video signal with the colour carrier ... MHz signal parts in the video signal. The parts you ... clipping high frequencies in the video signal (leaving a sharper picture ...
    ingo ingo April 2014 Hardware
  • ZX48 svideo modI have modded a ZX48 to have svideo output. The end of C65 that goes to TR2 (its an Issue 2 zx 48 ) has been lifted to get Chroma. Luma is taken fro…

    ... way to make the composite video mod to the spectrum circuit ... devices will have a coupling capacitor that nullifies the offset.
    RobeeeJay RobeeeJay April 2014 Hardware
  • TEA2000 mod for better CVBS quality?Has anyone tried this before? :confused: [URL=http://s1063.photobucket.com/user/JRT480/media/Evenmoreperfect_zpse2505ab9.jpg.html][IMG]http://i1063…

    ... these 2 photos: coil and capacitor are soldered together on one ... possible image, CVBS or S-video, out of a 48K, a ... . I must find a trimmer capacitor for better tunning.

    Renegade Renegade April 2014 Hardware
  • 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 jacks. (By adding a capacitor and a resistor it would ... ? Is there any (even destroyed) video signal present? What monitor / TV ...
    ingo ingo April 2014 Hardware
  • Video on single transistor composite video modification for 48K SpectrumsI made a video on the single transistor composite video mod, using an Issue two Spectrum although it applies to all issues. Much better than the sing…

    ... on the absence of a capacitor and/or 75 ohm resistor ... as you show in the video the RF modulator is ... to keep both video signals, RF and composite video? Would it be ... okay to share the video signal and +5v feed ... you did in the s-video mod)?

    Thanks ...
    Renegade Renegade April 2014 Hardware
  • Video on single transistor composite video modification for 48K SpectrumsI made a video on the single transistor composite video mod, using an Issue two Spectrum although it applies to all issues. Much better than the sing…

    ... resistor in the television composite video input completes the circuit. ... 128K circuit produces composite video at twice the required ... protection. If the composite video output is momentarily connected to ... R64 with a 22uF capacitor C25 to provide some ...
    rga24 rga24 April 2014 Hardware
  • Video on single transistor composite video modification for 48K SpectrumsI made a video on the single transistor composite video mod, using an Issue two Spectrum although it applies to all issues. Much better than the sing…

    ... the absence of a capacitor and/or 75 ohm ... keep both video signals, RF and composite video? Would it ... is composite. The S-video version looks a lot better ... reuse it for S-video (which requires two sockets ... the rest of the video circuit, turning the composite ...
    rga24 rga24 April 2014 Hardware
  • Trying to revive my +2B!Hey folks, Newly registered and looking for a fresh pair of eyes on my journey to restoring my +2B Spectrum :) I've done the Composite out conversi…

    A wire or capacitor straight off the video input to the modulator won ... the capacitor C24 which feeds the FM audio into the video signal ...
    guesser guesser April 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…

    ... .com/watch?v=IzgCmldm2H4"]this video[/URL], and let us know ... in your case is a capacitor installed incorrectly, or a faulty ...
    balford balford 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…

    ... .com/watch?v=IzgCmldm2H4"]this video[/URL], and let us know ... in your case is a capacitor installed incorrectly, or a faulty ... the reply thats indeed the video I am using as a ...
    Brian Brian June 2014 Hardware
  • Grey +2 - no sound during loadingI have a grey +2 here (issue 3), that is acting a bit strangely. I cleaned it and replaced/reversed TR4 to give it a stable RGB signal and so far all…

    ... schematic, resistor R80 (1k) and capacitor C26 (100nF) provide the sound ... (and optionally to the RGB/video out DIN socket when link ... both the resistor and the capacitor. 100nF capacitors do not normally ...
    1024MAK 1024MAK June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... them in my video interfaces for preparing monochrome video signals), cheap, small ... SMD IC - maybe a block capacitor, thats all. If you put ...
    PokeMon PokeMon June 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 ... use that pin for composite video.

    I just had ... :/
    It was the C8 capacitor right below IC1. I replaced ... /> Lights come on but no video or sound.
    Tried replacing ...
    thomas3120 thomas3120 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 …

    ... needing +12v is the LM1889 video encoder, without +12v you'll ... /> Edit: nice job on the capacitor replacement above, very neat work ...
    balford balford 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…

    ... there is a fairly big capacitor that I should also consider ... did in the power supplies video. Otherwise, it'd have to ...
    Zorn Zorn August 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... want to do the composite video mod to a 48K. And ... are the ways to improve video quality possible to perform on ... and there was originally one capacitor on top of LM1889 and ...
    Renegade Renegade August 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... a rather over engineered composite video mod.[/QUOTE]

    This ... a PAL or NTSC composite video signal over a 10m long ... this approach to a single capacitor a simple wire or even ...
    Dan Antohi Dan Antohi August 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... or capacitor is needed. But you won't find a video op ... computer with a baseband composite video output. And I don't ...
    rga24 rga24 August 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... use a sufficiently large value capacitor and ignore the problems :lol ... at the ones with external video inputs. So it's not ...
    guesser guesser 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…

    ... use) and as the only video output was the dreadful UHF ... " for a "decoupling" capacitor. A 47nF ceramic disc capacitor is not that ...
    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 ... 't know what an electrolytic capacitor is, leave well alone and ...
    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 ... 't know what an electrolytic capacitor is, leave well alone and ...
    Spekkie Spekkie August 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... , make a simple emitter follower video buffer (like the type used ... for composite video on ZX81's). Connect the ... the Y video signal and the output via a capacitor (22uF, 47uF ... emitter) to your TV composite video input. See if this gives ...
    1024MAK 1024MAK September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... make a simple emitter follower video buffer (like the type used ... the Y video signal and the output via a capacitor (22uF, ... emitter) to your TV composite video input. See if this ... the transistor modification minus a capacitor (didn't have anything suitable ...
    Wiggs Wiggs September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... composite signal. The "Y" video is a separate signal direct ... It only carries the monochrome video (no colour) and is ... 100uF electrolytic capacitor, with the negative side being the video output. ... monochrome signal by dropping the capacitor, have I done something ...
    Wiggs Wiggs September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... 100uF electrolytic capacitor, with the negative side being the video output. I ... monochrome signal by dropping the capacitor, have I done something wrong ...
    1024MAK 1024MAK September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... I first performed the composite video modification, a little lighter, but ... to pin 17, without a capacitor, which looks much like yours ... is something wrong with the video circuit somewhere.

    [IMG ...
    Wiggs Wiggs 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…

    ... clean supply for the LM1889 video chip.

    C44 is ... put a 100 nF multilayer capacitor in parallel with C44. Now ... 4116 RAMs, a 100 uF capacitor between pin 8 and ground ...
    Falco-F8L Falco-F8L September 2014 Hardware
  • 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…

    ... position of U8 (lower RAM = video file).
    Actually I used ... be removed by adding a capacitor of 1 nF from this ... ground. I soldered a SMD capacitor (series 0805) between pins 14 ... after inserting the 1 nF capacitor:
    [IMG]http://www.truppel ...
    ingo ingo September 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. …

    ... (they are connected) of the video IC LM1889 to check the ... you can find at the capacitor C45. )If there is that ...
    HZJ HZJ November 2014 Hardware
<1…14151617181920…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
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