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  • Kempston problemsI built a kempston interface a while ago, and it works well, but suddenly, when I load sabre wulf, select kempston interface, the fire button seems t…

    ... is somehow connected to the capacitor inside the spectrum that keeps ...
    Johan1973 Johan1973 May 2012 Hardware
  • Scratchy video after composite modIve re done the mod several times on this Issue 4B with the exact same results, anyone know whats up? Caps maybe? [youtube]fa1wk_epgjE[/youtube]

    ... caused by a failed filter capacitor) or perhaps a problem like ...
    Zorn Zorn June 2012 Hardware
  • Noisy PSUI recently picked up a 48k Speccy from eBay. It works fine but the PSU seems a little on the noisy side. I remember my old one gently humming back in…

    ... psu is the large filter capacitor which had simply become dry ...
    jammajup jammajup June 2012 Hardware
  • Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…

    ... some 'flying' components - usually a capacitor and/or diodes.
    Zorn Zorn June 2012 Hardware
  • 'Jumping' Composite Video Output on +2bNot having much luck recently... I have converted my +2b to composite out using the info contained [URL="http://www.secarica.ro/html/plus3_hardware.…

    ... is avoided by removing the capacitor that mixes the audio signal ...
    ingo ingo June 2012 Hardware
  • Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…

    ... emitter follower circuit, and a capacitor on the input to block ...
    Winston Winston July 2012 Hardware
  • ZX81 back porch fix using LM1881Hello! Has anyone here did the back porch fix for ZX81 using LM1881? I did it this weekend and instead of clear black on white i got black on dark g…

    ... use AC coupling through a capacitor (10u would find). What's ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • Bad signal on my ZX Spectrum+ 48kHi there... I just got my very first Spectrum, after search high and low for quiet some time :) But unfortunately, when I plug it in my tv, I don't …

    The TV will have DC blocking on the input anyway so the capacitor is unnecessary. Just a simple bit of wire is fine
    guesser guesser August 2012 Hardware
  • 48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…

    ... years.
    A bad electrolytic capacitor.
    Power supply circuitry becoming ...
    Knik Knik August 2012 Hardware
  • 48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…

    ... years.
    A bad electrolytic capacitor.
    Power supply circuitry becoming ...
    pkersey pkersey August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    Thats because they degrade with time. And the reset circuit is controlled by a electrolyte capacitor (amongst other things). Check the schematic for your ZX model.
    Johan1973 Johan1973 August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... is controlled by a electrolyte capacitor (amongst other things). Check the ...
    pkersey pkersey August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... from experience that the 1uF capacitor on the reset circuit in ...
    Johan1973 Johan1973 August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... fairly easy: using a decoupling capacitor and load resistor to pull ... the capacitor load to zero when there ... signal stable, I use another capacitor.
    After that, I have ...
    bverstee bverstee August 2012 Hardware
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... via a 0.1?F capacitor to the gate of the ...
    ingo ingo August 2012 Sinclair Miscellaneous
  • 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 blue 0.47?F capacitor is soldered to. You can ...
    ingo ingo August 2012 Hardware
  • Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…

    ... other than replace a bad capacitor or re-solder a loose ...
    RetroTechie RetroTechie August 2012 Chit chat
  • Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…

    ... say for sure that a capacitor is bad just by looking ...
    freddyhard freddyhard August 2012 Chit chat
  • 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…

    ... then I added an electrolytic capacitor of 150 ?F (you can ... correct this I added a capacitor of 560 pF from emitter ...
    ingo ingo August 2012 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…

    ... and to add one electrolytic capacitor to improve RGB signal.
    ingo ingo August 2012 Hardware
  • THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…

    ... output voltage of an unregulated capacitor smoothed dc supply:

    1024MAK 1024MAK August 2012 Hardware
  • 16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …

    ... a warm or deformed electrolytic capacitor change it.

    Ingo ...
    ingo ingo August 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... -5V. If there is a capacitor with low resistance your next ...
    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…

    ... . It might happen that the capacitor responsbible of generating the reset ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…

    ... myself had to add a capacitor of 33 ... 47 pF between ... the PCB I added a capacitor of 100 pF to ground ...
    ingo ingo August 2012 Hardware
  • strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…

    ... 'll check what placing the capacitor between pin1 and 7 does ...
    Knik Knik August 2012 Hardware
  • strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…

    ... .

    I tried the capacitor that you suggested, but it ...
    Knik Knik August 2012 Hardware
  • Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…

    ... /> Also the value of the capacitor can affect the frequency, as ...
    1024MAK 1024MAK August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    It wasn't that one 1uF capacitor. I haven't radial caps left to replace all, so I started checking RAMs and guess what.... they were all checked ok so far. Will keep looking and update everyone as I go. Ordering some caps.
    pkersey pkersey August 2012 Hardware
  • Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…

    ... .

    If the suspect capacitor is electrolytic and it is ...
    1024MAK 1024MAK August 2012 Hardware
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