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<1…11121314151617…34>
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... the right voltage range and polarity to take a Speccy PSU ...
    Winston Winston May 2008 Hardware
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... the right voltage range and polarity to take a Speccy PSU ...
    Cookie Cookie May 2008 Hardware
  • PSU polarityHi! I have a speccy+ psu and somewhere there is a loose connection.I suspect the end to the speccy side. I need to cut the wire and put a new socket.…

    ... to measure the voltage and polarity on the wires without having ... disconnected from mains!) to check polarity at the plug (i.e ... resistor of 1K to see polarity, but you'll have to ...
    Marcelo Marcelo June 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... /> R55 is replaced with a diode, there is a resistor 2 ...
    65C02 65C02 June 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    Oops - you got the polarity mixed up! :-o

    ... the ability to switch the polarity as required. Besides, when did ...
    Jimmy Jimmy June 2008 Hardware
  • Goodness me, I'm reading newspapers from 1785!Via the [url=http://archive.timesonline.co.uk/tol/archive/]Times Online[/url]. They've scanned 200 years worth of papers, from 1785 to 1985, all OCR'…

    ... two busy purchasing handheld light diode [American] football games (because, you ...
    usspeccyfan usspeccyfan June 2008 Chit chat
  • Goodness me, I'm reading newspapers from 1785!Via the [url=http://archive.timesonline.co.uk/tol/archive/]Times Online[/url]. They've scanned 200 years worth of papers, from 1785 to 1985, all OCR'…

    ... two busy purchasing handheld light diode [American] football games (because, you ...
    Lee Fogarty Lee Fogarty June 2008 Chit chat
  • I/O on the Speccy - ideas/help wanted!I'd like an interface for the Spectrum that can control and monitor other items. I have a task in mind that would require: A: 4xbinary inputs (as in…

    ... drove relays (with a protecting diode of course).

    the ...
    guesser guesser July 2008 Hardware
  • I/O on the Speccy - ideas/help wanted!I'd like an interface for the Spectrum that can control and monitor other items. I have a task in mind that would require: A: 4xbinary inputs (as in…

    ... relays even with the snubber diode, so it's a good ...
    Winston Winston July 2008 Hardware
  • I/O on the Speccy - ideas/help wanted!I'd like an interface for the Spectrum that can control and monitor other items. I have a task in mind that would require: A: 4xbinary inputs (as in…

    ... relays even with the snubber diode, so it's a good ...
    guesser guesser July 2008 Hardware
  • The much rumoured Pandora is finally being built !!!!!!!20 years late though. Its from the people who made the GP32, GP2X. Its a hand held similar in size to a DS. [IMG]http://pandora.bluwiki.com/images/…

    ... themselves wired incorrectly with the polarity on one of the speakers ...
    Dunny Dunny July 2008 Chit chat
  • Build your own Pentagon 1024SLAlexey aka KingOfEvil was so kind to give me an english manual for the Pentagon with most (except for the floppy controller) chips adapted to "wester…

    ... 2 transistors with a wrong polarity. Still doesn't explain the ...
    Shockwav3 Shockwav3 September 2008 Hardware
  • missing transformerI've dug a screen out of a heap of hand-me downs I want to use with my computer, but I can't seem to find the transformer for it. If I find one from …

    And the polarity (centre pin positive, etc.).
    < ...
    Laser Laser September 2008 Chit chat
  • ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p

    ... load, change Spectrum models, even polarity in SPIN, but nothing happens ...
    Pegaz Pegaz September 2008 Emulators
  • Issue 2 Board - CPU 'Patch'I've been wondering why my issue 2 board has been kicking out this signal when powered up... [IMG]http://www.drumfu.com/ResizedDuffIssue2.jpg[/IMG] …

    ... either a transistor (TR6) or diode/resistor modification (see Issue 2 ...
    jp jp September 2008 Hardware
  • A question from a 'newbie'I have just acquired a ZX Spectrum 48k, but without a power supply. I tried it with a 9v power supply from a Sega Game Gear, and got a picture on my …

    ... Megadrive era, have the same polarity as the spectrum's.
    If the polarity was reversed you would have ...
    gtsamour gtsamour November 2008 Hardware
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... />
    I would use a diode instead of R71 to avoid ...
    ingo ingo January 2009 Hardware
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... usefull to add a suppressor diode BZW06-5V8 ( [url]http://www ...
    ingo ingo January 2009 Hardware
  • ZXCF conundrumsBefore I start spending time prodding my ZXCF, I ought to ask... Anyone else have problems with the ZXCF losing its memory between power cycles? I'v…

    Don't own a ZXCF, but the only diagram at hand (v.1.2) says there is
    also 1K in series with battery and diode.
    roko roko January 2009 Hardware
  • ZXCF conundrumsBefore I start spending time prodding my ZXCF, I ought to ask... Anyone else have problems with the ZXCF losing its memory between power cycles? I'v…

    ... , presumably that's just a diode drop's worth). However, I ... doing?[/QUOTE]

    Replace diode with jumper... You will have ...
    zboskovi zboskovi January 2009 Hardware
  • New Guy Wants Speccy - SWAP !Hi, I`m new here so here is a little background info ! I always had a C64 when I was in my teens in the 80`s, my friends had Spectrums, so it was alw…

    ... been damaged by my reverse polarity episode ?
    I`ve a ...
    daznic daznic February 2009 Wanted
  • Keys don't work even with new membrane, HELP!Hi folks. I have a 1983 48k Zx Spectrum. It powers up fine, but none of the keys respond. I have tried fitting a new keyboard membrane from rwap, but…

    ... Note there is a diode between each KB2 pin and ... their continuity tester with a diode tester, and don't ... also check continuity from the diode to the ULA (you' ... ll need to get the diode number off the schematic) ... joint has failed on the diode, but this is unlikely. ...
    Winston Winston February 2009 Hardware
  • New Guy Wants Speccy - SWAP !Hi, I`m new here so here is a little background info ! I always had a C64 when I was in my teens in the 80`s, my friends had Spectrums, so it was alw…

    ... been damaged by my reverse polarity episode ?
    I`ve a ...
    DEATH DEATH February 2009 Wanted
  • Build your own Pentagon 1024SLAlexey aka KingOfEvil was so kind to give me an english manual for the Pentagon with most (except for the floppy controller) chips adapted to "wester…

    ... drive again (turned out a diode blew up). Also tested the ...
    Shockwav3 Shockwav3 February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... a 1N5401 3A 100V rectifier diode in series with the input ...
    DEATH DEATH February 2009 Hardware
  • Getting audio from Currah uSpeechHi! I've just got a Currah uSpeech, it's working (I have the copyright message on top of the screen above the (c) 1982...) but I'm in Argentina, and…

    ... with Speccies HF over a diode.
    The mini-plug indeed ...
    roko roko February 2009 Hardware
  • issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…

    ... this capacitor has a
    polarity, and did you place it ...
    roko roko March 2009 Hardware
  • issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…

    did you check for +5v ? if there is 5v, the cap is healty and polarity respected I don't see how it could get hot,
    Nuno2009 Nuno2009 March 2009 Hardware
  • issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…

    Capacitors should never get hot. But electrolytic ones do if they are put in with the wrong polarity. (Tantalum ones by contrast tend to explode).
    Winston Winston 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…

    ... /> Be sure to watch the polarity: center pin is -, outside of ...
    RetroTechie RetroTechie March 2009 Hardware
<1…11121314151617…34>

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