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Search Again :: Adv Search 1000 results in 0.007s
<1…16171819202122…34>
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    ... generated on-board using a circuit similar to that on a ... on D20 (near the 7805 voltage regulator) cathode (lead nearest the ...
    1024MAK 1024MAK February 2014 Hardware
  • Cooler padI have this cooler pad that prevents an old laptop from getting overheated like hell. It is powered by plugging it to the usb port. I don't have a sp…

    ... a Recom converter?
    [/QUOTE]

    Its a voltage regulator. I ...
    rune rune March 2014 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    ... the on board switching power circuit. The older design does not ... and sometimes too higher input voltage may cause damage.
    The ... ) can handle a higher input voltage.

    The second ... be released by the 7805 voltage regulator.

    [B][ ...
    1024MAK 1024MAK March 2014 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    That on load voltage seems ok.

    I ... caused the internal TR4/TR5 circuit to stop working. The unit ...
    bagpuss22 bagpuss22 March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... and white areas inverted or voltage is inverted?[/QUOTE]

    voltage is the brightest part and ... the highest voltage is the "bottom" of the ... by the composite video generation circuit.
    guesser guesser March 2014 Hardware
  • My TV is dying....oh no's!So I'm thoroughly enjoying my return to Spectrum life at the moment. But something is becoming clear to me. Or to be more exact, clearly fuzzy to me.…

    ... likelihood is that the HT voltage is down on the tube ... . Normally a sign that the voltage tripler is on the way ... /> I'd save buying the converter box, and go for a ...
    ramsrc ramsrc March 2014 Hardware
  • My TV is dying....oh no's!So I'm thoroughly enjoying my return to Spectrum life at the moment. But something is becoming clear to me. Or to be more exact, clearly fuzzy to me.…

    ... likelihood is that the HT voltage is down on the tube ... the control signals to the converter box, but I have not ...
    Amplitude Amplitude March 2014 Hardware
  • ZX48 svideo modI have modded a ZX48 to have svideo output. The end of C65 that goes to TR2 (its an Issue 2 zx 48 ) has been lifted to get Chroma. Luma is taken fro…

    ... video mod to the spectrum circuit. It works, but I have ... of strain on the original circuit.[/QUOTE]

    I doubt ... a strain on the original circuit, it would never be expected ... . So it's the wrong voltage (but pk-pk seems fine ...
    RobeeeJay RobeeeJay April 2014 Hardware
  • Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…

    ... 'd have to see the circuit, but probably. You'd have ... come with things like the voltage drop across the diode and ...
    guesser guesser April 2014 Hardware
  • 48k no beeper sound (again!)Got three 48k+ here, all of which have the same exact problem, no sound out the beeper, same problem as detailed [URL="http://www.worldofspectrum.org…

    ... connections. A high reading / open circuit reading indicates a blown speaker ... less (than the ULA pin voltage) on diode D9 cathode ( ... k) lead (with the same voltage on transistor TR7 base terminal ... as a current amplifier. The voltage on the emitter terminal (the ...
    1024MAK 1024MAK April 2014 Hardware
  • 48k black paper white borderI recently sold a speccy to a guy, unfortunately the power supply didnt survive the trip, so on replacing for him it seems neither did the speccy! H…

    ... regulator at this voltage, hence the rest of the circuit wouldn't ...
    balford balford April 2014 Hardware
  • Video on single transistor composite video modification for 48K SpectrumsI made a video on the single transistor composite video mod, using an Issue two Spectrum although it applies to all issues. Much better than the sing…

    ... the 48K video circuit, the 128K circuit produces composite video ... function; that of short circuit protection. If the composite ... In the 48K circuit, there is no spare voltage in the composite ... in the collector circuit. The entire video circuit +5V supply is ...
    rga24 rga24 April 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... the tab of the 7805 voltage regulator (where the heatsink attaches ... lead of each resistor. The voltage on the other end will ... by other components in the circuit, but should be no greater ...
    1024MAK 1024MAK May 2014 Hardware
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... logic on a mini printed circuit board mounted above the vias ... SCLD TS# have a wide voltage swing (from ground to +5V ... from U21 have a lower voltage swing (from ground to a ...
    rga24 rga24 May 2014 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... I tried a non-inverting circuit with 2x amplification.
    [IMG ... />
    Then I tried a voltage follower, connecting the output to ...
    bverstee bverstee May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... with a practical clock recovery circuit a while back now to ... put off by the low voltage power supply which would complicate ... then pass it through this circuit [IMG]http://markamy.uwclub.net ... planning to add an alternate circuit for the 128k spectrums, which ...
    Basher Basher May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... they don't have any voltage clamping on their inputs so ... the parts bin" factor to circuit design going on.

    circuit

    it uses the ...
    Winston Winston May 2014 Hardware
  • HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …

    ... I think the clock recovery circuit will have too much jitter ... it for doing a VGA converter, and the output of the ...
    Winston Winston May 2014 Hardware
  • Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…

    ... it is a rectangular AC voltage to be directed to -12V ... provided by this DC-DC converter?

    Note for readers ...
    lfaria lfaria May 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... the SPICE showed that the circuit would not work in the ... ensure that the "logic low" voltage to the Schmitt inverter went ...
    1024MAK 1024MAK June 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    ... biggest sources are the 7805 voltage regulator followed by the ULA ... br />
    With an expansion circuit board plugged in, the 7805 ... or a pre-regulator circuit. Or a simpler circuit, such as three ... the heatsink from the 7805 voltage regulator. Clean off any ...
    1024MAK 1024MAK June 2014 Hardware
  • I wonder what this is?Just having a browse on ebay and came across [URL="http://www.ebay.co.uk/itm/191216974918"]this[/URL], I wonder what its for?

    Although I've not seen one of these before my guess is this interface connected to another circuit board, a DAC(digital-to-analogue converter), which then made up an audio sampler system for the Speccy.
    Your Spec-chum Your Spec-chum June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... /> Can you also measure the voltage coming directly from the PSU ... too high a voltage which kills the oscillation circuit formed by the ...
    balford balford June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... /> Can you also measure the voltage coming directly from the PSU ... too high a voltage which kills the oscillation circuit formed by the ...
    Brian Brian June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    The internal switching regulator circuit in 16k/48k Spectrums has ... correctly when the loaded input voltage was 12V or higher.
    voltage. Don't forget to measure ... to have the meter in circuit so that the current flows ...
    1024MAK 1024MAK June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... ;776199]The internal switching regulator circuit in 16k/48k Spectrums has ... correctly when the loaded input voltage was 12V or higher.
    voltage. Don't forget to measure ... to have the meter in circuit so that the current flows ...
    Brian Brian June 2014 Hardware
  • AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…

    ... describing is a 3.3V voltage regulator. It reduces the +5V ... /plus/128k+ machines the 7805 voltage regulator works so hard, it ... picture :D.

    The circuit that TR4 and TR5 are ...
    1024MAK 1024MAK July 2014 Hardware
  • video cable with +128 rgb jack and red + black rcaive been give what is supposed to be a video cable it has the connector on that would fit a +128 video socket and the at the other end a red and blac…

    ... the meter on the DC voltage range to test the batteries ... leads or resistors (out of circuit) this makes no difference. But ... wired/connected/soldered to a circuit, the polarity does make a ...
    1024MAK 1024MAK July 2014 Hardware
  • ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…

    ... the wiring for TR5 emitter circuit! The error is in the ... has this part of the circuit shown correctly. The emitter should ... (if it shows results as voltage) or a low-ish resistance ... . The result should be a voltage >1V or an over ...
    1024MAK 1024MAK July 2014 Hardware
  • Zx Spectrum 128k Toaster RGB pinoutHi all When I use my +2 scart cable on my 128k the picture looks terrible, so I have bought the din plug to make my own. Most sites from what I ca…

    ... the Toastrack 128K Spectrum the circuit shown on Paul's site ... should be at the appropriate voltage level to command the TV ... one should get the appropriate voltage. Paul suggested the safest method ...
    jimre jimre August 2014 Hardware
<1…16171819202122…34>

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