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<1…17181920212223…34>
  • 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…

    ... then any of the 2 voltages is still not ok, I ...
    Knik Knik May 2012 Hardware
  • +3 PSUHiya. Having moved house 3 times since using my +3, I appear to have lost the power supply. I don't suppose anyone has a spare they would like to s…

    ... PSU this has all the voltages you need and is easier ...
    guesser guesser May 2012 Wanted
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... .[/QUOTE]

    Measuring the voltages at the coil with a ...
    Zorn Zorn June 2012 Hardware
  • Better Picture QualityToday I built a PSU and RGB-SCART monitor cable for my +3. However, I'm not too happy with the picture quality. It appears that there's like halos a…

    ... you are getting the correct voltages out of the scart cable ...
    guesser guesser June 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... number of tries. The 3 voltages were OK though.
    It ...
    roko roko June 2012 Hardware
  • Ear + Mic bits behaviour in relation to beeper outputHave just read [url=http://www.worldofspectrum.org/forums/showpost.php?p=348953&postcount=38]this old post of Joefish's [/url] in the development for…

    ... can effectively generate 4 different voltages on pin 28 (which drives ... EAR is 0, the two voltages generated (MIC=0 and MIC ...
    Jon Needle Jon Needle June 2012 Emulators
  • Ear + Mic bits behaviour in relation to beeper outputHave just read [url=http://www.worldofspectrum.org/forums/showpost.php?p=348953&postcount=38]this old post of Joefish's [/url] in the development for…

    ... EAR is 0, the two voltages generated (MIC=0 and MIC ... four levels, mapping the ULA voltages directly to the sample values ...
    Patrik Rak Patrik Rak June 2012 Emulators
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... measure.

    Check your voltages on lower memory.
    Johan1973 Johan1973 June 2012 Hardware
  • Need some advice about electronicsI have wired up an ATX power supply to power my spectrums through a DC-DC converter that gives 9V from the +12V rail. It works well. However, I also …

    ... ground levels without influencing differential voltages between ground and signals.
    ingo ingo June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    [QUOTE=Turrican;635259]OK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :(
    [/QUOTE]

    What part of the DC-DC circuit does not work? Which voltages do you have and which are not there?
    Johan1973 Johan1973 June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    ... circuit does not work? Which voltages do you have and which ...
    Turrican Turrican June 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... any guide to checking RAM voltages etc, none are getting hot ...
    napoleonblownaparte napoleonblownaparte June 2012 Hardware
  • Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …

    ... 's a good sign the voltages are OK and you get ...
    RetroTechie RetroTechie 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…

    ... work with such low input voltages?

    I also have ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    Ok, now I've got myself together and had time to check, all the voltages seem to be in the right places - is there anything else I can test?
    napoleonblownaparte napoleonblownaparte July 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... since you have the correct voltages.
    Unless you happen to ...
    Johan1973 Johan1973 July 2012 Hardware
  • Changing the mains cord in PSUI have an UK +3 PSU. I have an adapter to use it in Euro mains jacks but I want to change the mains cord to one with an Euro plug. You have to change…

    actually you might be on to something... I have in the past powered a +2A from a amiga 500 Psu as it has all the same voltages as the Spectrum +2A, +3 might be worth converting one for your Spectrum.
    lips2k11 lips2k11 July 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…

    ... regulator would do indeed... the voltages look correct but it might ...
    pkersey pkersey 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…

    ... use them to compare two voltages (comparator), amplify a voltage with ... stable, even with different input voltages.

    I hope to ...
    bverstee bverstee 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…

    ... get the positive and negative voltages that float around zero, to ...
    bverstee bverstee 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]…

    ... DC power plug, the output voltages on my PSU are:-
    1024MAK 1024MAK August 2012 Hardware
  • Spectrum +2A not workingI bought my first Spectrum, the +2A, and it's not working. When I try to start it, only the power led is blinking and no picture to TV. What could be…

    Something weird has happened to PSU because earlier it gave right voltages, but now voltages are too low. I tried AT-power from old PC and now Spectrum is working. At first it didn't load tapes but cleaning helped.
    zapper zapper 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…

    ... work properly)
    - Stable output voltages, fast response, built in protections ...
    bverstee bverstee August 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... diodes don't allow dangerous voltages to enter the logic cells ...
    mcleod_ideafix mcleod_ideafix August 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... diodes don't allow dangerous voltages to enter the logic cells ...
    ANDREW RYALS ANDREW RYALS August 2012 Sinclair Miscellaneous
  • 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…

    ... .

    How is your voltages out from the power circuit ...
    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…

    ... are okay. [/QUOTE]

    Voltages look good compared to another ...
    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…

    ... =Johan1973;648210]How is your voltages out from the power circuit ... ?[/QUOTE]

    So far, voltages look ok. Will keep inspecting ...
    pkersey pkersey August 2012 Hardware
  • ZX Spectrum power supplyHi, I'm looking for a small lightweight power supply that would be a perfect substitute for the original, it's meant for a video patched zx spectrum…

    ... - since it has all the voltages and amperages to power several ...
    Zetr0 Zetr0 August 2012 Hardware
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    ... it is still holding.
    Voltages seem ok with the exception ...
    Knik Knik September 2012 Hardware
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