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Search Again :: Adv Search 753 results in 0.001s
<1…891011121314…26>
  • Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …

    ... it is normal because diode has forward drop voltage and ... measuring to fully open the diode.
    Look at the ... A/V curve for a diode:

    [url] ... /wikipedia/commons/a/a5/Diode-IV-Curve.svg[/url]< ... />
    So, any real diode has some voltage drop and ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …

    Several multimeters have the posibility to measure Vd directly. That is what the 'diode' position of the big switch is for.
    roko roko May 2012 Hardware
  • Repairing Spectrum PSUHi everybody, In my ever-growing collection of Spectrum PSUs, I have an ever-growing sub-collection of dead Spectrum PSUs. Some of these can be rep…

    ... in a bridge configuration each diode only conducts 1/2 the ...
    RetroTechie RetroTechie May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... both and test them (the diode test function of a DMM ...
    Zorn Zorn May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... ?
    2) what is "the diode test function of a DMM ...
    tiago tiago June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... well throw in a fresh diode there. Did that, and voila ... . Have never experienced that a diode checks out on meter and ...
    Johan1973 Johan1973 June 2012 Hardware
  • DIVIDE 2k11hello, just short link - for Your info (cpld, 4 layers, rohs, cpld code for future development for clones..) [url]http://lotharek.pl/product.php?…

    ... ]
    How to repair a diode.... That's not the point ...
    roko roko June 2012 Hardware
  • DIVIDE 2k11hello, just short link - for Your info (cpld, 4 layers, rohs, cpld code for future development for clones..) [url]http://lotharek.pl/product.php?…

    ... enter, computer restarts and mapram diode lights ?

    May I ...
    lotharek lotharek June 2012 Hardware
  • DIVIDE 2k11hello, just short link - for Your info (cpld, 4 layers, rohs, cpld code for future development for clones..) [url]http://lotharek.pl/product.php?…

    ... enter, computer restarts and mapram diode lights ?

    May I ...
    velesoft velesoft June 2012 Hardware
  • Spectrum 48+ sound problemHi all, I gotta problem with my little box of tricks? It's the hard key Speccy 48+ but the sound is really faint, is there any way to fix this?

    ... />
    You could also check D9 and TR7.
    Zorn Zorn June 2012 Hardware
  • Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…

    ... ). Also, as there is a diode in the +5V output line ... the ON voltage for a diode/transistor by the way). Put ...
    mcleod_ideafix mcleod_ideafix June 2012 Hardware
  • +3e Strange IssueHello there my fellow WoS'ers I am absolutely perplexed by the following problem, I am hoping that someone more enlightened than I can help [I](no…

    ... /> It turns out that D2 (Diode 2) positioned next to the ...
    Zetr0 Zetr0 June 2012 Hardware
  • +3e Strange IssueHello there my fellow WoS'ers I am absolutely perplexed by the following problem, I am hoping that someone more enlightened than I can help [I](no…

    *sigh*

    For the last time there's no such thing as an NPN diode, a diode only has a single PN junction :p
    guesser guesser June 2012 Hardware
  • Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…

    ... />
    It turned out that Diode 2 (D2) a 1n4148 NP ...
    Zetr0 Zetr0 June 2012 Hardware
  • Known Z80 M1 problems?I got an email yesterday from someone asking for a Z80 without the M1 problem. I only know about the fanout problem that many Z80's are suffering of…

    ... .

    Zetr0 mentioned the diode issue he experienced. I checked ...
    pmsr pmsr June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    ... Issue 2 it was a diode that checked out ok on ...
    Johan1973 Johan1973 June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    ... Issue 2 it was a diode that checked out ok on ...
    Turrican Turrican June 2012 Hardware
  • Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…

    ... , which was acting strange. Replaced Diode, and replaced TR4 and TR5 ...
    Johan1973 Johan1973 June 2012 Hardware
  • Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…

    ... , which was acting strange. Replaced Diode, and replaced TR4 and TR5 ...
    roko roko June 2012 Hardware
  • All going well with the 3.5" driveFolks, all going well thanks to you lot on here... I now have a +3 with an external 3.5" floppy and can write .dsk images using samdisk - all very e…

    ... read somewhere i need a diode somwhere. But you picture does ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • All going well with the 3.5" driveFolks, all going well thanks to you lot on here... I now have a +3 with an external 3.5" floppy and can write .dsk images using samdisk - all very e…

    ... read somewhere i need a diode somwhere. But you picture does ... ?[/QUOTE]

    nope no diode required, you can add switches ...
    BiNMaN BiNMaN July 2012 Hardware
  • Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …

    ... -5V I guess is bad diode D11, D12 or D16. Test ...
    Johan1973 Johan1973 July 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... [current limiting] resistor, then to diode D3 cathode (A10 trace) .
    1024MAK 1024MAK August 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    ... were fitted with an alternative diode and resistor so you could ...
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... , but are blue from the diode directly.
    So there is ...
    bverstee bverstee August 2012 Hardware
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... circuit to boost the photo diode output, and outputs a voltage ...
    bverstee bverstee August 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... mistake, my intention is used diode clamp to protect at EAR ...
    superfo superfo August 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... />
    With only one 1N4148 diode and one 470 ohm resistor ...
    antoniovillena antoniovillena August 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... of the transformer and the diode D15.

    As Zorn ... do the job. Check if Diode D15 (in 12V line) acts ... as diode.

    [quote=Knik]When ...
    ingo ingo August 2012 Hardware
  • 16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …

    ... . Then I hooked up a diode to the 9V pin on ...
    Johan1973 Johan1973 August 2012 Hardware
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