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<1…19202122232425…34>
  • Spectrum +2 datacorderHi, my Spectrum +2 datacorder isn't working. Does anyone know if I can still load software through the tape/sound socket at the back of the machine i…

    ... ?

    Feeding any external tape signal to the +2A circuitry ... the datacorder circuitry normalises the tape signal before
    passing it ... offset), some diodes and a transistor (TR4) between the EAR ULA ...
    Jose_Leandro Jose_Leandro September 2009 Hardware
  • Specdrum SyncroI'm having trouble syncing my (revision 4b)48k specdrum. The sync pulses sent out of the MIC socket are low, barely +50db, and isn't powerful enough…

    ... to save a program to tape, the output is also low ... C35 for the EAR/MIC circuit, my board has a brown ...
    apprenticemart2 apprenticemart2 September 2009 Hardware
  • I bought my first ZX Spectrum 48k, now what ?Hi guys ! I recently go to Brussel in Belgium and found a ZX Spectrum at a "flea market" (sorry, I don't the correct word for that, let's call it a …

    ... already goes through a transistor buffer in the Spectrum. ... feels pointless to add another transistor amplifier stage...[/QUOTE]
    ... good electrical reason why any transistor is required, see my ... with no additional impedance matching circuit - I didn't feel ...
    RST#08 RST#08 September 2009 Hardware
  • +3 sound cureHi all, As most of us know the Spectrum+3A has this sound problem, distortion. The +3B had this problem fixed. I done some looking at the circuitry l…

    ... emitter of TR3 (the last transistor before the modulator).The reason ... can add a series resonance circuit consisting of an inductor of ...
    ingo ingo October 2009 Hardware
  • RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …

    ... />
    Essentially, the basic paging circuit comprises of the following things ... is a schematic of a circuit that allows up to 512K ... to. There is also a transistor that pulls up the ROMCS ...
    Winston Winston December 2009 Hardware
  • Composite video and reset buttonOK, I've got some Kempston clone interface here, and I've added a phono socket and a small momentary switch to it (ages ago but forgot about it) . :)…

    ... convenient to use a NPN transistor as a buffer, and to ... required output impedance.
    The transistor wiring would be: C = 5V ... can use a BC239 / BC337 transistor.

    [QUOTE=spider;403183 ... must be a temporary closed circuit switch.
    mcleod_ideafix mcleod_ideafix December 2009 Hardware
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... measure [I]just[/I] the transistor, you have to disconnect 2 ... you'd have to unsolder transistor leads themselves. Useless, this ... chance of killing (overheating) the transistor.

    Usually I ... of a transistor by measing its effect in a circuit. If it ...
    RetroTechie RetroTechie December 2009 Hardware
  • Come along chaps......(From the Dr.Who Thread...) [QUOTE=guesser;412226]oh dear, I've been told off! sorry for losing my temper and taking everything out on you ewgf. Yo…

    ... had to build your own tape interface circuit or hope someone's ...
    NickH NickH January 2010 Chit chat
  • need help with +3 sound mod..well my friend has been doing the mod.. and well informed me the info / instructions aren't 100% there.. basically the matrix of cap's / resisters i…

    ... that 1/2 of the circuit is on the +3's ... top half of the right circuit. (if you want stereo ACB ... guts. So right now the Tape/Sound socket only has beeper ... resistor network as per the circuit on the top right.
    nuggetreggae nuggetreggae January 2010 Hardware
  • ZX Spectrum + Revision b Power IssueHi all, I'm trying to repair a ZXSpectrum + revision 3b and at the moment the -5v is missing from the board. I've replaced the TR4 and will be soon…

    ... produces the -5v, a complete circuit (usually called a switch mode ... any one component in that circuit fails, so does your SMPS ... is the inductor and the transistor is the switch. (There's ...
    Winston Winston February 2010 Hardware
  • Another question on solderingWell, I thought of creating a cool little input device much like this one: [url]http://www.instructables.com/id/HDDJ_Turning_an_old_hard_disk_drive_…

    ... by sticking little squares of tape onto the underside of the ... of these wires onto the circuit board from an old keyboard ...
    Dave_C Dave_C February 2010 Chit chat
  • Which ZX Spectrum setup?I'm building a semi-pro laser setup, with.. a ZX Spectrum as controller! [url]http://gathering.tweakers.net/forum/list_messages/1297705[/url] (I'm no…

    ... will focus on the foto-transistor circuit, and the security circuitry, to ...
    bverstee bverstee February 2010 Hardware
  • Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…

    ... crashes unless a write protect circuit is added (more components, more ... , the initial programming from a tape, subsequent ones over ethernet. I ...
    Winston Winston February 2010 Hardware
  • Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…

    ... ? C44? I cannot read the circuit scan of the service manual ... ). TR4 is problematic because few transistor are equivalent.

    [For ... , I use a tip31 transistor (very common transistor but it's very ...
    Jose_Leandro Jose_Leandro March 2010 Hardware
  • Spectrum +3 Scart and Video CaptureHi all, I have my Spectrum +3 hooked up to my telly via scart. I have a PCI video capture card fitted into my PC and a copy of DScaller (freeware u…

    ... the video circuit and take the sound from the tape/sound socket ...
    guesser guesser March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    Well, there were several situations in the past that I wanted to use midi on the Spectrum with.

    1. I used the Midi out port on a ZX Spectrum 128K heatsink model to send data to a Yamaha Cs1x for my first laserharp.
    That laserharp had ten ...
    bverstee bverstee March 2010 Hardware
  • Test / comments wanted: new composite video output for +2A/+3I've been fiddling with the composite video mods for +2A and +3... with no luck. Because neither desings in [url=http://www.secarica.ro/html/zx_zone.…

    Yes, it works, even no transistor circuit. Just take signal from pin 6 of TEA2000 direct to monitor. I have done it long time ago.
    superfo superfo March 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…

    ... something is wrong with video circuit? TR1 or TR2?[/QUOTE]
    transistor in the video circuitry, video ...
    RetroTechie RetroTechie April 2010 Hardware
  • Flicker fixer for ZX 48KHas anyone the schematics for the flicker fixer: [URL]http://8bit.yarek.pl/computer/zx.48/[/URL] Micky

    ... need:
    A PNP transistor, such as BC557
    ... a bit of duct tape or some kind of ... ULA again. Take the transistor and identify BASE, EMITTER ... can bend the transistor pins so the transistor body rests ... be chosen for the transistor). Take the EMITTER pin ...
    mcleod_ideafix mcleod_ideafix April 2010 Hardware
  • Speccy Games - big list available for saleHi, my first post! I've had a large batch of Spectrum games loitering for a few years and want to get rid of them. They are mostly early to mid 80'…

    ... 1991
    Crash Magazine Tape Feb 1992
    Crazy ... Great Escape / Arkanoid / Frankie / Short Circuit / Cobra / Head Over Heels / Yie ... /> Silkworm
    Sinclair Test Tape
    Sinclair User Club
    Sinclair User Great 8 - Tape 9
    Skateboard
    ...
    plimsol plimsol May 2010 Sales
  • What does this screen mean?Hi, I wonder if someone might be able to shed some light on what this screen means when powering up the machine: [url]http://i720.photobucket.com/a…

    ... - CPU clock signal gone (buffer transistor dead?), power supply-related stability ... bad, a crack in a circuit board trace, etc. etc.
    RetroTechie RetroTechie May 2010 Hardware
  • Timex 2048 documentsHi, I got Timex 2048, seems to work, but no colors on screen :cry:. Neither TV out, nor Composite works. ULA fault ? It seems TC 2048 uses MC 1377 a…

    ... /> Issue 2 is loading from tape (silent loading to confirm earlier ... was changed. It seems new transistor Q6 plays some role here ...
    kpuchatek kpuchatek May 2010 Hardware
  • ZX 48K loudspeaker with 8 Ohm possible?Is it possible to change the loudspeaker from the ZX 48K with a model which has only 8 Ohm? Micky

    ... for the speaker circuit, possible destruction of the transistor.
    9V / 8 ...
    mcleod_ideafix mcleod_ideafix May 2010 Hardware
  • ZX 48K loudspeaker with 8 Ohm possible?Is it possible to change the loudspeaker from the ZX 48K with a model which has only 8 Ohm? Micky

    ... for the speaker circuit, possible destruction of the transistor.
    9V / 8 ...
    alien8r33d alien8r33d May 2010 Hardware
  • ZX 48K loudspeaker with 8 Ohm possible?Is it possible to change the loudspeaker from the ZX 48K with a model which has only 8 Ohm? Micky

    ... base-voltage (minus theshold), the transistor simply will stop conducting! So ... happen in this self-stabilizing circuit. I hope you appreciate this ...
    roko roko May 2010 Hardware
  • Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…

    ... ZX81. So you add a transistor buffer stage, something like this ... added a capacitor to above circuit. I found ~47uF to be ... =better for this purpose. + to transistor output, - soldered to RCA center ... pin. Used a BC546(B) transistor - may not be optimal choice ...
    RetroTechie RetroTechie June 2010 Hardware
  • ZX +2 - Can I connect external tape player?Is it possible to connect external tape player to ZX Spectrum +2/A and use it instead of the internal player? The connector is marked tape/sound, but…

    ... lead to use an external tape player if you are prepared ... a signal. There is no circuit protection when you do this ...
    thingley thingley June 2010 Hardware
  • ZX + 2: Why Audio from RGB Connector ?Does anyone know what is the difference between the standard "tape/sound" output and the audio output inside of the RGB DIN connector? Does the RGB c…

    ... the differences in the sound circuit (and a mod to make ... TR4/TR200 is connected to tape output and "RGB" output, so ...
    Zup Zup June 2010 Hardware
  • How to solderI've just tried soldering two wires together (one end'll fit in my computer, and the other into a little radio) I found that when I stripped the two …

    ... it onto your pre-tinned circuit board**

    *this is ... wrap the whole lot in tape
    guesser guesser July 2010 Chit chat
  • 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 ... two, using the more advanced circuit of the TC2068 but restoring ...
    chev chev July 2010 Hardware
<1…19202122232425…34>

Latest Posts

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tape 31.9K 47.7K
circuit 4K 5.5K
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