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<1…24252627282930…34>
  • Can you remote-"fry" a PC?Here's the account of an occurence from a few years ago, something that has been nagging me a little ever since. Back then, I used to hang out in a …

    ... /> both were , they changed the voltage at the back of the ...
    fog fog February 2010 Chit chat
  • KemPAY Interface for ZXHello everyone, ZX fans I comitted a new interface for ZX spectrum. It`s idea is not new but design and funcionality brings a little bit of freshnes…

    ... in that they use different voltage signal on the edge connector ...
    Hercules Hercules February 2010 Hardware
  • It is the DR-202A suitable for my Spec +3?Hi, folks! Here is my question. I need a data recorder to load my tape games in my +3. I have located a nice model from Sanyo, the DR-202A but I don…

    ... datarecorder only runs on mains voltage. :cry:

    For use ...
    RetroTechie RetroTechie February 2010 Hardware
  • Spectrum 48K with a thyristor PSU possible?Is it posssible to use a Spectrum 48K with a thyristor switched PSU? I have a PSU with a thyristor, 4 diodes, one electrolyt capacitor, some resistor…

    [QUOTE=-Micky;427736]Oh, I forgot to list the transformator. Micky[/QUOTE]
    In this case you can set it to 9 Volt and connect to the 48K.
    This "thyristor" is one adjustable voltage regulator chip like the LM317T.
    Gods Gods March 2010 Hardware
  • Spectrum 48K with a thyristor PSU possible?Is it posssible to use a Spectrum 48K with a thyristor switched PSU? I have a PSU with a thyristor, 4 diodes, one electrolyt capacitor, some resistor…

    [QUOTE=Gods;427793]In this case you can set it to 9 Volt and connect to the 48K.
    This "thyristor" is one adjustable voltage regulator chip like the LM317T.[/QUOTE]The thyristor is a SO817MH.


    Micky
    -Micky -Micky March 2010 Hardware
  • Spectrum 48K with a thyristor PSU possible?Is it posssible to use a Spectrum 48K with a thyristor switched PSU? I have a PSU with a thyristor, 4 diodes, one electrolyt capacitor, some resistor…

    Why can't a PWM regulated PSU be used with the Speccy as long as it's giving the right voltage ?
    Pilsener Pilsener March 2010 Hardware
  • Spectrum 48K with a thyristor PSU possible?Is it posssible to use a Spectrum 48K with a thyristor switched PSU? I have a PSU with a thyristor, 4 diodes, one electrolyt capacitor, some resistor…

    Because PWM is often ment to regulate speed (S), not voltage (V). The difference is the type of feedback used. (V) takes the resistive (ohmic) load into account, and (S) often acts on the 'back emf' returned by an inductive load like a drill.
    roko roko March 2010 Hardware
  • Spectrum 48K with a thyristor PSU possible?Is it posssible to use a Spectrum 48K with a thyristor switched PSU? I have a PSU with a thyristor, 4 diodes, one electrolyt capacitor, some resistor…

    ... (simple) switching mode step-down voltage regulator! The use of a ... the design to provide various voltage outputs.
    The LM2576 is ...
    Gods Gods March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... that if unregulated, the PSU voltage varies significantly with load, ... i.e. voltage measured directly with a voltmeter ... Spectrum. On-load, the voltage will be somewhat lower, and ... of RAM) have all correct voltage supplies present. Pin 1 ...
    RST#08 RST#08 March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... ].

    3/ The PSU voltage on load is 11,6V ...
    gibs gibs March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... that way exceed supply voltage (because that supply voltage isn't there ...
    RetroTechie RetroTechie March 2010 Hardware
  • Which reset method on ZX 48K?What reset method is correct on issue 3b ZX 48K: One wire to R68 and one to C27 (Manual from ZX Spectrum +) or One wire to Pin 26 from CPU and one …

    ... "]here[/URL] ('Reg' is the voltage regulator, to which the aluminium ...
    RST#08 RST#08 March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... doing it, I checked the voltage on IC23 Pin 5 and ...
    gibs gibs March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... doing it, I checked the voltage on IC23 Pin 5 and ... , normally close to +5V supply voltage), but with short pulses 'logical ...
    RetroTechie RetroTechie March 2010 Hardware
  • Control a Model Railway with ZX Spectrum?When I got my Spectrum from Ebay, it came with the previous owner's collection of books, magazines, tapes etc. One of the books was : First Steps wi…

    ... model railway by varying the voltage supplied to the rails.
    voltage applied and you modulate data ...
    guesser guesser March 2010 Development
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... and ground (and thus lowering voltage input)?

    --------------------------

    Zup Zup March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... your video. Lowering the collector voltage to 5V should lower that ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    - Tested lowering voltage input to +5v: same results ... generating some signal).
    - Lower voltage with capacitor: still black screen ...
    Zup Zup March 2010 Hardware
  • Do not open, no idiot servicable parts inside.Hi im very sad abd in need of some help thanks. Ok heres the deal i bought a second hand pc, it worked brill the only problems were the psu didnt fi…

    ... is debatable, but any high voltage capacitor should be treated as ...
    Winston Winston March 2010 Chit chat
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... .
    I have done some voltage check on IC6:
    Pin ...
    gottrek gottrek April 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... [/I] diodes! Also see the voltage rating on it - diodes don ...
    RetroTechie RetroTechie April 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... stable image, and the supply voltage for +12V indicated above, is ... the 7805 get as input voltage? (and with "get" I don ...
    RetroTechie RetroTechie April 2010 Hardware
  • What these?While I was scanning some material from Eric Deeson I came across a couple of pieces of hardware I haven't seen before. [url]ftp://ftp.worldofspectr…

    ... would then be something like voltage regulator(s) + cooling plates.
    RetroTechie RetroTechie April 2010 Hardware
  • DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…

    Kempstone and Interface 2 (without ROM) should work ok.
    I do not see point of conflict with DIVIDE.
    Sometimes power is an issue - if you connect too much
    to edge, voltage will go down.
    kpuchatek kpuchatek April 2010 Hardware
  • DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…

    ... too much
    to edge, voltage will go down.[/QUOTE]
    Alien 8 Alien 8 April 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... quite a step forward. This voltage is not enough though.
    roko roko April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    ... a [I]regulated[/I] DC voltage that's just high enough ... current-limiting mode, read: output voltage will drop below the normal ...
    RetroTechie RetroTechie April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    ... a [I]regulated[/I] DC voltage that's just high enough ...
    RST#08 RST#08 April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... come directly from external DC voltage, and (just for kicks) ... all the voltage conversion circuitry (TR4/5, ... 18V), and a ripple voltage on unregulated DC supply doesn ... ... somehow...

    The voltage conversion circuitry does generate an ...
    RetroTechie RetroTechie April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... out that increasing the DC voltage to negate the need for ... to drop the increased excess voltage.

    If DCin = 9V ...
    alien8r33d alien8r33d April 2010 Hardware
<1…24252627282930…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
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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