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Search Again :: Adv Search 1000 results in 0.009s
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  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... cells to work out what circuit/track/traces go where. This ... non-destructive as the test voltage is too low to harm ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... you have? Electronics bench variable voltage type with current limiting? Any ... plug-in voltage regulated types? Any non- ... as a short circuit coil, any other short circuit or faulty ... that you can take some voltage readings to help work ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... the TR8 / TR9 power supply circuit, lets get an idea if ... a little bit of a voltage drop caused by the normal ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... ]The Spectrum internal inverter power circuit[/B][/U]

    ... version of the internal power circuit is [URL="http://www. ... amplifier". It compares this voltage to the voltage on the +5V line ... a low value resistor (short circuit) which is one way ...
    1024MAK 1024MAK August 2013 Hardware
  • Anyone using an RGB SCART cable with a +2A/+3 and LCD TV?In [URL="http://www.worldofspectrum.org/forums/showthread.php?t=44697"]a recent thread[/URL], I mused: [quote]Can +2As be composite modded? If so, I…

    ... inputs without needing the blanking voltage present. I suspect that some ... just blindly follow a random circuit diagram off the internet...
    guesser guesser August 2013 Hardware
  • Spectrum 48k video and keyboard issueHi all, few days ago I experimented with battery supply for my speccy (48k issue 2), and I was measuring the voltage and how much current it used. A…

    ... battery), to measure the supply voltage there (to check if it ... short occured (a closed loop circuit), and I guess that was ...
    dimewos dimewos September 2013 Hardware
  • Linking spectrums - parralel processing is it possible?Was there any way to do this, (excluding disk, tape and microdrives)?

    ... and able to handle the voltage?

    /Pedro[/QUOTE]
    circuit anyway.
    Knik Knik September 2013 Hardware
  • Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …

    ... very simple reset circuit (with no "brown-out" circuit). And part of ... a FAST, high precision, adjustable voltage supervisor IC, which does not ... 2 microseconds of the supply voltage dropping below 4.75 V ...
    Dan Antohi Dan Antohi September 2013 Hardware
  • Another odd +2 board - no composite video partsI was checking a stack of grey +2's, and found a board where the modulator was missing. First I thought that someone must have pulled it off to use o…

    ... doesn't supply a correct voltage for the blanking signal (scart ... OK.

    Furthermore this circuit doesn't supply brightness, where ...
    bverstee bverstee October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... due to having gone short circuit - but this is rare).

    The 7805 voltage regulators often get blamed for ...
    1024MAK 1024MAK October 2013 Hardware
  • Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…

    ... . Like Falco said, the power circuit of the Opus is dead ... used) and put a double-voltage SMPS (or two single ones ...
    skagon skagon October 2013 Hardware
  • One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…

    ... of wire. Normally an AC voltage is applied to the coil ... the winding is not open circuit. But, you may not be ... if there is a short circuit fault between different (parts of ...
    1024MAK 1024MAK October 2013 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... low and affects the output voltage from the ULA (as shown ... be seen it uses a voltage regulator to obtain the signal ... is converted down to a voltage level suitable for the BLANKING ... be buffered through an external circuit and then all issues of ...
    Fruitcake Fruitcake November 2013 Hardware
  • Faulty grey +2, or not?While I?m still fighting with two to three grey +2 computers, which doesn?t give a video signal, I received another grey +2, which acts very strangel…

    ... percentage of their maximum working voltage across them to achieve their ... ,000V circuit.

    Don't worry too much about voltage ratings ... if it has a higher voltage rating than you need
    voltage rating.

    It is ...
    DEATH DEATH November 2013 Hardware
  • Faulty grey +2, or not?While I?m still fighting with two to three grey +2 computers, which doesn?t give a video signal, I received another grey +2, which acts very strangel…

    ... it nicely.
    Basically, the voltage ratings on electrolytics should be ... order of magnitude as the voltage across them, taking into account ... , obviously). So, in a 5V circuit you usually get 16V rated ...
    skagon skagon November 2013 Hardware
  • I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…

    ... , I prefer a nice test circuit on stripboard using separate -5V ... resistors (also good for measuring voltage, and therefore current drawn) complete ...
    1024MAK 1024MAK November 2013 Hardware
  • Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…

    ... or equivalent fixes the power circuit, however a failure in one ... . (less than 7V of input voltage)

    2) The +12V ... usual 8-9V (9V supply voltage minus 0.7V) that is ... .

    I would check voltage on the power supply jack ...
    Falco-F8L Falco-F8L November 2013 Hardware
  • Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …

    ... />
    Is the voltage on the +12V line very ... (test on the 7805 voltage regulator)? If yes, then ... good +12V, check the voltage across (between the left ... If you have a good voltage here, either the zener ... circuit.

    EDIT: or if you get no voltage, ...
    1024MAK 1024MAK November 2013 Hardware
  • ZX Spectrum and add-on temperaturesImre Jakli from Hungary sent me some interesting pictures which I think are worth to share. These are about temperatures he measured with a modern to…

    ... .2A was fine), because the voltage drop of the unloaded
    circuit. After the computer
    started ...
    jimre jimre December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... +3 (or any other digital circuit) working and feeding it +12V ... board blowing up (see reverse voltage). Maybe even some chips. It ... also take it, the short-circuit was brief, perhaps even momentary ...
    skagon skagon December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... +3 (or any other digital circuit) working and feeding it +12V ... board blowing up (see reverse voltage). Maybe even some chips.[/QUOTE ...
    guesser guesser December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... board blowing up (see reverse voltage).[/QUOTE]

    Shorting ... supply and the short circuit) for any given circuit.

    ... short circuit load, so if you were to measure the voltage ( ... on either +12v or +5v) upstream of the short circuit ...
    Winston Winston December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... each other. However, in a circuit being "fed" 5V through the ... true.
    If you short-circuit the computer's ground plane ... the point of the short-circuit. The only thing that could ... they could withstand a negative voltage surge of very limited duration ...
    skagon skagon December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... Spectrum +3, with a short circuit appearing on the PCB at ... the 0V/GND voltage on the Spectrum circuit board will rise with ... PSU. But on the Spectrum circuit board, the components "down stream ... not see the 0V/GND voltage change by any significant amount ...
    1024MAK 1024MAK December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... way that prevented the over voltage from also reaching the ASIC ... . For example, if the over voltage was extremely brief it may ... is happening with the reset circuit).

    I'd put ...
    Winston Winston December 2013 Hardware
  • +2A/+3 composite modHi, Anyone has experience doing a composite output mod for +2A/+3? (yes.. I also have a working RGB) A while ago I did one based on the instruction…

    ... doing that, I measured the voltage at LUM IN during black ... have a note of what voltage I found or what resistor ... IN under the old composite circuit, I worked out the gain ... the TEA2000. In the new circuit the luminance output is taken ...
    rga24 rga24 December 2013 Hardware
  • Tape loader for Android at lastHi all. Just downloaded a little util from the google play store called tapdancer. Works like the apple spectrum tape loader. Lets you load speccy an…

    ... is not volume but audio voltage. Your headphone jack cannot produce ... made my own very basic circuit based on online Gide's ...
    Lost Lost January 2014 Emulators
  • Using a Euro Sinclair PSU in UKI've got a EURO1400 PSU with a Euro plug. Am I right in thinking I can just cut the pug off and change it to a UK plug, and it will work fine? The on…

    ... &_nkw=UK+to+euro+converter+plug&_sacat=0& ... problem. Worst case - the output voltage of the PSU may be ... be dissipated by the 7805 voltage regulator.
    It is however ... not connected to the Spectrum) voltage will be higher (typically between ...
    1024MAK 1024MAK January 2014 Hardware
  • Using a Euro Sinclair PSU in UKI've got a EURO1400 PSU with a Euro plug. Am I right in thinking I can just cut the pug off and change it to a UK plug, and it will work fine? The on…

    ... ,

    Just check the voltage on and off load.
    the internal TR4/TR5 circuit to stop working. The unit ...
    bagpuss22 bagpuss22 January 2014 Hardware
  • Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…

    ... . Have a look at the circuit diagram and I'm sure ... 's internal audio I/O circuit cell gets damaged and then ... has applied too high a voltage to one of the audio ...
    Zorn Zorn January 2014 Hardware
<1…15161718192021…34>

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