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<1…20212223242526…34>
  • Issue 1 80K SpectrumHere's the other Spectrum I acquired last weekend. It's an [URL="http://www.drumfu.com/Issue1.jpg"]Issue 1[/URL] with an [URL="http://www.worldofspec…

    ... of adapters. I set the voltage at 7.5V - which works ...
    jp jp March 2009 Hardware
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... to sense a 0. The voltage on the stray capacitance will ... that current but if the voltage does not cross the TTL ... a just below TTL high voltage by the end of the ...
    Alcoholics Anonymous Alcoholics Anonymous March 2009 Hardware
  • Using a Spectrum in JapanHi all, at the moment I have a 48k Spectrum on its way (with a LOT of other stuff) to Japan where I intend to use it. So I have some fairly straight…

    ... as you have the right voltage and Amerpage (and polarity on ...
    beanz beanz April 2009 Hardware
  • Plan BHi all, so, here is the Spectrum I won recently : [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=330306627242[…

    ... fine, but often the ouput (voltage) level is quite low. I ...
    RetroTechie RetroTechie April 2009 Wanted
  • Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…

    ... a working Speccy with that voltage in the 12V line.
    Hernán Pablo Álvarez Hernán Pablo Álvarez April 2009 Hardware
  • monitor troublehello I have been havig trouble with my monitor(NEC Multisync 75F),for some time now and i need some help.I have had this monitor for 8 years,and th…

    ... try to adjust the G2-voltage a little and see if ... of the tube. The G2-voltage adjustment is usually the lower ...
    Pilsener Pilsener April 2009 Chit chat
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... the volume corresponding to the voltage levels as found in the ...
    Patrik Rak Patrik Rak April 2009 Development
  • Loading games from MP3 playersI read on here ages ago about people running Speccy games from MP3 players or iPods.. Would I be right in assuming that you would plug said player i…

    ... that means there's no voltage across them...)

    (Ooh ...
    gasman gasman April 2009 Hardware
  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... ) signals are overlayed by DC voltage of about 2.5V. So ...
    ingo ingo April 2009 Hardware
  • ZX81 expander - Is there one for the Speccy?Saw this on ebay today: [url]http://cgi.ebay.com/ZX81-Timex-Sinclair-1000-Expander-board_W0QQcmdZViewItemQQcategoryZ4193QQihZ010QQitemZ200338572087Q…

    ... get to a sufficiently high voltage if it's connected to ...
    Winston Winston May 2009 Hardware
  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... ) signals are overlayed by DC voltage of about 2.5V....
    piters piters May 2009 Hardware
  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... state rapidly pulling up the voltage on the ground lines near ...
    Winston Winston May 2009 Hardware
  • Loading games from MP3 playersI read on here ages ago about people running Speccy games from MP3 players or iPods.. Would I be right in assuming that you would plug said player i…

    ... . Relay could be driven by voltage of tape motor. So normally ...
    ingo ingo May 2009 Hardware
  • Which (new) car would you buy?I am thinking of changing cars. After 9 years in my [URL="http://space-car.piranho.de/e/mai01.htm"]Renault Kangoo[/URL] I am thinking of buying a n…

    ... house. Even at 25kV (the voltage used by electric trains with ...
    Winston Winston June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    ... would get around half the voltage, and others would be dead ...
    joefish joefish June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    ... nearly catch fire because the voltage of the mains supply had ...
    guesser guesser June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    ... . The consequence was, with the voltage being low, all the tones ...
    Winston Winston June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    ... . The consequence was, with the voltage being low, all the tones ...
    Scottie_uk Scottie_uk June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    It's also important to unplug refrigerators and other equipment that has electric motors if you experience "half power".
    Low voltage can cause electric motors to burn out.
    Pilsener Pilsener June 2009 Chit chat
  • Weird we have half the power.We have just had a momentary power cut, now everything has come back on we only have half the power. The old traditional lights bulbs are only ligh…

    ... experience "half power".
    Low voltage can cause electric motors to ...
    Scottie_uk Scottie_uk June 2009 Chit chat
  • computer wisdom neededany ideas? my computers dying, yesterday my computer developed a fault whereby itd keep freezing up, it did it on my XP and ME partitions and even o…

    ... hot or giving out excess voltage/amperage ripple this can also ...
    Scottie_uk Scottie_uk June 2009 Chit chat
  • computer wisdom neededany ideas? my computers dying, yesterday my computer developed a fault whereby itd keep freezing up, it did it on my XP and ME partitions and even o…

    ... wizard[/URL]. watch the PSU voltage rates and/or the CPU ...
    freddyhard freddyhard June 2009 Chit chat
  • not much gear and absolutley no ideaIm looking for some help with two spectrums that i have just dug out of storage and are both unfortunatley faulty. I had always regreted that during …

    ... (this is supplied by the voltage regulator) then the lower memory ...
    Winston Winston June 2009 Hardware
  • Need to amplify output of voice recorderHello all! 1st post, so be nice to me... Pleeease! Well. I have several Spectrums (working: 3x 48k, 1x +, 1x 128k "Toaster", 1x +2 and 1x +2A; bust…

    [QUOTE=Arawn;362344]Mono, sensible to 90mV, uses 3V (2x 1.5V).[/QUOTE]
    A 3V battery won't provide enough 'audio voltage' to make a Spectrum happy. You need 'voltage', not power.
    roko roko June 2009 Hardware
  • Need to amplify output of voice recorderHello all! 1st post, so be nice to me... Pleeease! Well. I have several Spectrums (working: 3x 48k, 1x +, 1x 128k "Toaster", 1x +2 and 1x +2A; bust…

    ... won't provide enough 'audio voltage' to make a Spectrum happy ... . You need 'voltage', not power.[/QUOTE]


    What is the necessary voltage to drive the Spectrum's ...
    Arawn Arawn June 2009 Hardware
  • Need to amplify output of voice recorderHello all! 1st post, so be nice to me... Pleeease! Well. I have several Spectrums (working: 3x 48k, 1x +, 1x 128k "Toaster", 1x +2 and 1x +2A; bust…

    ... ;362410]What is the necessary voltage to drive the Spectrum's ...
    roko roko June 2009 Hardware
  • power supply questionHi all, got my +2 ( Grey) back home to Canada. monitor should display ok, and I have a power supply I think will work. specs are : Input 120 V…

    Voltage is not really the problem ...
    Tom-Cat Tom-Cat June 2009 Hardware
  • Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…

    In general "no video but keyclicks" suggests absence of 12V.
    This voltage is generated inside the Spectrum, together with -5V for lower memory. Absence of these voltages might (will) damage lower memory.
    roko roko June 2009 Hardware
  • Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…

    ... absence of 12V.
    This voltage is generated inside the Spectrum ...
    nxgshadow nxgshadow June 2009 Hardware
  • divide plus back to life , preorderI have green light form authors to made DIVIDE PLUS, anybody interested? Promise from me , fully asembled and tested DIVIDE PLUS in plastic case. Qua…

    ... exception of the buffer and voltage regulator. I made the first ...
    Winston Winston June 2009 Hardware
<1…20212223242526…34>

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