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Search Again :: Adv Search 1000 results in 0.016s
<1…20212223242526…34>
  • Schematics for loading amplifier?I'm interrested in making an external portable amplifier in order to be able to load speccy games using an mp3 player. I looked in the internet but c…

    ... data loading.

    This circuit would take you backward and ... .

    You need a circuit capable of sufficient voltage output ... two power transistors to this circuit and then have a power ... signal is inverted by any tape drive - and there is no ...
    ingo ingo July 2010 Hardware
  • Schematics for loading amplifier?I'm interrested in making an external portable amplifier in order to be able to load speccy games using an mp3 player. I looked in the internet but c…

    ... , why not buy the whole circuit pre-assembled and ready to ... signal is inverted by any tape drive - and there is no ...
    Sparky Sparky July 2010 Hardware
  • Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…

    ... connector. However, since the +2A circuit is essentially the same as ... sound fixed and no disk circuit) I suspect an on-board ... , such as disconnecting the internal tape deck, would enable this port ... . No need to disconnect the tape deck:
    [url]http://www ...
    Metalbrain Metalbrain August 2010 Hardware
  • New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…

    ... about it), and found this circuit:

    [IMG ... course; it's the tape-circuitry of one of ... the components in that circuit, and your values and ... components!
    Also my circuit lacks the loading sound, I ... built and tested that circuit? You must have, ...
    bverstee bverstee August 2010 Hardware
  • ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…

    ... of how a diode and transistor work, I was able to ... turned into the actual integrated circuit. All in all, fascinating read ...
    Patrik Rak Patrik Rak September 2010 Sinclair Miscellaneous
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... from the hip here: The transistor patch was actually on the ... , the circuit is IIRC exactly the same, except the transistor has a ... ;= 128 ) the output of the transistor TR6 (which is configured as ... OR gate outputs low, the transistor is ON, holding IORQGE high ...
    Winston Winston September 2010 Hardware
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    [QUOTE=Winston;476548]The transistor patch was actually on the ... , the circuit is IIRC exactly the same, except the transistor has a ... to probably instead replace that circuit with:[/quote]
    Hmmm. A ...
    Jonathan Harston Jonathan Harston September 2010 Hardware
  • Speccy 48k Earphone jack problemThis is odd, today I set up my rubber key as normal, headphone out of the tape player into the "ear" of the spectrum, started everything off but noth…

    ... normal, headphone out of the tape player into the "ear" of ... games, (not, however, loading them, tape errors after the lead in ... .... Until I realised that my "tape recorder" was set too low ... 's very little in the tape input circuit of the speccy that ...
    csmith csmith September 2010 Hardware
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... are just another kind of transistor. In this kind of application ... the reader. In this particular circuit, the parasitic capacitance of the ...
    Winston Winston September 2010 Hardware
  • +2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…

    ... can, and and near the transistor TR5, which is to the ... a date printed, perhaps the tape motor in the +2 is ...
    guesser guesser September 2010 Hardware
  • +2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…

    ... and while studying the circuit boards closely for date codes ... version 2 is the "+2B circuit" (which is fitted in ...
    (the "+2A/+3 circuit" used numbers in the xx ... 1xx range for the tape drive board, and a ... LED. The "+2B/+3B circuit" that fixed the sound ...
    guesser guesser September 2010 Hardware
  • +2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…

    ... MC1376 chip. It has a transistor circuit.

    I searched in ...
    Jose_Leandro Jose_Leandro September 2010 Hardware
  • +2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…

    ... MC1376 chip. It has a transistor circuit.

    I searched in ... found a schematic showing the transistor circuit instead of the FM modulator ...
    guesser guesser September 2010 Hardware
  • +2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…

    ... found a schematic showing the transistor circuit instead of the FM modulator ...
    Jose_Leandro Jose_Leandro September 2010 Hardware
  • Recapping your SpeccyHas anyone ever done it? I have several vintage amps, tuners, cassette decks that have been recapped. So just wondering are there many on WOS who ha…

    ... ]I have never seen short circuit electrolytic capacitiors, by the way ... + with a dead transverter. The transistor was dead. I substituted it ...
    ingo ingo October 2010 Hardware
  • Broken +3I have noticed that some members on this forum prefer to repair Spectrums instead of just buying another one from ebay. I would like mine fixed at so…

    ... function of this strange spider transistor" will be, each time, more ... around the reset button, the tape socket broke off the motherboard ...
    ASM ASM October 2010 Hardware
  • zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…

    ... and had a "Dead Cockroach" circuit added, but this only affected ... which was fixed with a transistor mounted on top of the ...
    The President The President October 2010 Hardware
  • Can someone identify thisSorry if it's something extremely obvious but this is the first time I've had my hands on a Spectrum in about 20 years (thanks eBay) and although som…

    ... what is beneath that masking tape. I'd be very tempted ... ]
    It's the normal transistor patch for Issue2. Which exists ... of nothing more but a transistor and a wire. My private ... as alternative solution for the transistor.
    roko roko October 2010 Hardware
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... destructively. But with a bipolar transistor, the static electricity - up to ... remove the power from the circuit, and it effectively shorts Vcc ...
    Winston Winston October 2010 Hardware
  • Spectrum +3 and DivIDE+I have won a +3 on ebay. When it arrives, I know that I can use my DivIDE+ with it, but I have read about the +3E ROMs. I mostly use Spectrums to pla…

    ... a +3? Regarding the audio circuit, the +3 that I had ... is mono, either from the tape/sound socket, through the RF ... +2Bs have a modified sound circuit which sounds much nicer. I ... to match the +2B/+3B circuit
    guesser guesser October 2010 Hardware
  • Microdrive problem?I recently aquired a micro-drive, Interface 1 and some brand new cartridges + the original manual, so i thought i'd rig it all up and see what it …

    ... trying to load from a tape, but it's not possible ... or data lines (by short circuit?) in the Interface.
    LCD LCD October 2010 Hardware
  • Spectrum +3 doesn't workMy recently ebay purchased +3 arrived today, so I was quite excited to have one again. I plugged it in and all was well, except for a slightly worry…

    ... , it's a pretty simple circuit.

    The bigger worry ... 'm hoping I blew a transistor or two. I was going ...
    Alien 8 Alien 8 October 2010 Hardware
  • Challenging Common Knowlege: The +2A/B[I]I was going to write a big long essay about my research on this subject, but being an incredibly lazy person I never really got anywhere with that…

    ... 3s have a dud AY circuit? Is this only present ... RGB port or the Tape/Sound port is always ... a poorly designed sound generation circuit (possibly done by mistake). ... The circuit was corrected in the + ... the +3 sound circuit into the +2B one.
    guesser guesser November 2010 Sinclair Miscellaneous
  • Challenging Common Knowlege: The +2A/B[I]I was going to write a big long essay about my research on this subject, but being an incredibly lazy person I never really got anywhere with that…

    ... the RGB port or the Tape/Sound port is always better ... a poorly designed sound generation circuit (possibly done by mistake). The ... circuit was corrected in the +2B ... to change the +3 sound circuit into the +2B one.[/QUOTE ...
    Alien 8 Alien 8 November 2010 Sinclair Miscellaneous
  • Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…

    ... p=491600&postcount=9"]transistor diagram[/URL] must be ... Anyway suggest how a transistor can be wired up to ... have to bias the transistor in such a way ... .org/wiki/Bipolar_transistor_biasing"]transistor biasing[/URL]. Transistor circuit analysis is a ...
    guesser guesser November 2010 Hardware
  • Powerpack melts! +3 survives!I woke up this morning, switched on the sockets, went to the loo 'as you do' and came back into the living room. I heard this clicking sound so I th…

    ... , a brief short circuit blows the relevant transistor up in the PSU ...
    guesser guesser November 2010 Hardware
  • Powerpack melts! +3 survives!I woke up this morning, switched on the sockets, went to the loo 'as you do' and came back into the living room. I heard this clicking sound so I th…

    ... , a brief short circuit blows the relevant transistor up in the PSU ...
    Alien 8 Alien 8 November 2010 Hardware
  • Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…

    ... will have to bias the transistor in such a way that ... it set up so the transistor is either off or saturated ... . Effectively, it's a digital circuit rather than an analogue one ... too much about keeping the transistor in its active region :-)
    Winston Winston November 2010 Hardware
  • Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…

    ... have to bias the transistor in such a way ... wikipedia.org/wiki/Bipolar_transistor_biasing"]transistor biasing[/URL]. Transistor circuit analysis is a ... set up so the transistor is either off or ... too much about keeping the transistor in its active region :-)[/ ...
    BloodBaz BloodBaz November 2010 Hardware
  • What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…

    ... , apart from once the tape deck goes you've kind ... mod to allow an external tape deck to be added. ... The +2 tape deck has no volume ... some issues with loading by tape. My personal favourite is ... , unfortunately they bodged the circuit at the factory, but ...
    Alien 8 Alien 8 November 2010 Hardware
<1…20212223242526…34>

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