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Search Again :: Adv Search 1000 results in 0.002s
<1234567…34>
  • Didaktik Kompakt MI have probably spelt it incorrectly, but - does anybody know the power requirements for this little machine? What connectors does it use, polarit…

    ... and a protection against reverse polarity diode inline with it though, so ...
    DEATH DEATH February 2006 Hardware
  • Spectrum 48K and wrong power supply polarity!!!Hello, I need a help fixing my Spectrum 48K, motherboard issue 4B. Since I'm in Canada, I couldn't use standard spectrum power supply, so I checked a…

    ... smoke... I think that center polarity was positive, instead of required ...
    tiho tiho January 2005 Sinclair Miscellaneous
  • BA157 diodeUsed in Speccies, so not too off topic :P Right, it's a "fast recovery rectifier diode" - can anybody tell me what that means exactly? Fast recover…

    ... 's a "fast recovery rectifier diode" - can anybody tell me what ... what the difference between this diode and a normal 1N40XX is ... "it's a fast recovery diode"
    DEATH DEATH April 2006 Hardware
  • PSU polarityHi! I have a speccy+ psu and somewhere there is a loose connection.I suspect the end to the speccy side. I need to cut the wire and put a new socket.…

    ... be opened,to understand the polarity.
    I do not have ...
    Pyjamarama Pyjamarama June 2008 Hardware
  • Sinclair FTV1 - Power supply polarity?I've just dug out my old Sinclair FTV1 pocket telly. Does anyone know the polarity of the power supply requirements, before I plug it in and blow it…

    ... />
    Does anyone know the polarity of the power supply requirements ... mention anywhere as to the polarity....
    chaosmongers chaosmongers January 2010 Sinclair Miscellaneous
  • ZX Spectrum Pre-regulator DesignCarrying on from the "[URL="http://www.worldofspectrum.org/forums/showthread.php?t=44486"]Issue 2 crashes after about 30 mins[/URL]" thread... [QUOT…

    ... includes both input reverse polarity protection and a power ...
    ............ 1N5817 1A Schotttky Diode e.g. Rapid 47-0824 ... or
    ............ BZX55C8V2 Zener Diode 0.5w Do35 8.2v ... /> ............ BZX55C8V2 8v2 500mw Zener Diode Rapid 47-3024
    LED1 ...
    1024MAK 1024MAK August 2013 Hardware
  • Using a +3 power supply to power a CPC.Hi there, I'm going to try and power a CPC6128 using a +3 power supply. The +3 supplies 12V DC 0.2A and 5V DC 2A, the CPC6128 needs 12V DC 0.4A and …

    ... know.

    Is my diode idea rubbish then?[/QUOTE]
    polarity protection or something? In which ...
    DEATH DEATH September 2006 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... a second with the wrong polarity is all it takes ... to include a diode to prevent reverse polarity damage, but he ... page).

    "Reverse polarity destroys the regulator almost instantly ... possibility you should always use diode protection of the power ...
    Womble Womble July 2007 Hardware
  • ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…

    ... the equipmens, give the right polarity all the time.

    diode would protect the equipment, if ...
    guesser guesser August 2007 Hardware
  • ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…

    ... into circuit with the correct polarity. You eed to make sure ... show :)

    A single diode is all you need to ...
    DEATH DEATH August 2007 Hardware
  • I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…

    ... most things (although reversing the polarity of the input tends to ... from happening with a protection diode).

    One of the ...
    Winston Winston September 2007 Hardware
  • I killed my SpectrumMy room was a mass of leads.... and I plugged my NES transformer into my ZX Spectrum +2 accidently, frying it :cry: , am I screwed? or is there somet…

    ... was DC and the right polarity. As its AC connecting it ... , and one with the wrong polarity for the other 25 times ... internally was a well placed diode, and it doesnt.

    Womble Womble March 2008 Hardware
  • issue 2 sound /loading problemshi guys ive just done component video conversion on this issue 2 board that went well..but when i had case off i did notice that there was a glass di…

    ... watch polarity!
    Btw. are you sure it's a diode? In ...
    RetroTechie RetroTechie December 2009 Hardware
  • +3 psu schematics and partsHi everyone. Does anyone have or knows where to get the +3 psu schematic? I'm trying to repair one but i cant find any info on the parts reference. …

    ... electrolytic capacitors have definitely wrong polarity. I also agree the R6 ... look like a 1N4148 switching diode, but it's more likely ... a 12V zener diode.

    A few years ...
    TMX TMX June 2010 Hardware
  • Getting a ZX Spectrum to work in the USHello all, I'm terribly new to these forums but not to the use of the Spectrum. I have a few in my collection of old machines and one of them I am …

    1. Get the polarity right.
    2. Get the polarity right.
    3. Get the polarity right.
    ....
    964823. Get the polarity right.

    You'll kill the machine if you don't - there's no protection diode.
    Winston Winston August 2010 Hardware
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    ... you also can discover the diode I put in series with ... has same plug but different polarity.) The board in the picture ... these Recoms can stand reversed polarity? :-)
    roko roko May 2011 Hardware
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    ... " it. I didnt know about polarity stuff back then, the result ... /> I actually don't use diode safety because I always go ...
    gtsamour gtsamour May 2011 Hardware
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    even if the regulator survives the reversed polarity, remember that the 9v is connected to other components too. I think adding a diode directly after the socket is a very good idea.
    guesser guesser May 2011 Hardware
  • RECOM pin compatible DC-DC 7805 regulator replacementsFinally got myself sorted out now. If you want to purchase chips send me an email to [email]alistair@alistairsserver.no-ip.org[/email] with your payp…

    ... diode (to prevent damage when accidentally connected with an incorrect input polarity ...
    1024MAK 1024MAK August 2012 Hardware
  • Fixing a broken ZX Spectrum HELPHello I have no experience with computers predating the PC and this is my first computer of this sort S: One of my father's coworkers gave me his ol…

    ... ]Okay, I've changed the polarity... it's troublesome that I ... , when connected to the right polarity so it must be broken ... the power supply with reversed polarity, you destroyed a UA7805 and ... hand. It must have a diode check.

    More suggestions ...
    Falco-F8L Falco-F8L November 2012 Sinclair Miscellaneous
  • Fixing a broken ZX Spectrum HELPHello I have no experience with computers predating the PC and this is my first computer of this sort S: One of my father's coworkers gave me his ol…

    ... the power supply with reversed polarity, you destroyed a UA7805 and ... hand. It must have a diode check.

    More suggestions ...
    Tova96 Tova96 November 2012 Sinclair Miscellaneous
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... technology of standard transformer, a diode bridge and smoothing capacitor is ... of Zorn to glue the polarity switch in the correct position ...
    Pierre Pierre May 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... includes both input reverse polarity protection and a power ...
    ............ 1N5817 1A Schotttky Diode e.g. Rapid 47-0824 ... or
    ............ BZX55C8V2 Zener Diode 0.5w Do35 8.2v ... /> ............ BZX55C8V2 8v2 500mw Zener Diode Rapid 47-3024
    LED1 ...
    1024MAK 1024MAK July 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…

    ... this AC waveform through to diode D20 and on to C41 ... charges up with the opposite polarity. On the next positive AC ...
    1024MAK 1024MAK August 2013 Hardware
  • 48k+ Power Supply quickieGuys, Can someone tell me if I can safely use the power supply of the 48k+ in a 48k? My guess is yes, but I don't want to do something I will regre…

    ... had had to pick one polarity or the other....
    [/QUOTE ... extra 2p on a protection diode.

    [QUOTE=1024MAK;720792 ...
    guesser guesser September 2013 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…

    Hi,

    first of all: The temperature of the regulator of the harlequin will not rise while rising the voltage at input. It is a switching regulator with high efficiency. If you use a higher supply voltage the input current will decrease so the ...
    ingo ingo April 2014 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…

    ... (diode bridge) is fitted, it will sort out the correct polarity, so ... being wired with the wrong polarity. You can still use peripherals ... ensure you have the correct polarity on the plug for the ... place of the bridge rectifier (diode bridge).

    Some ...
    1024MAK 1024MAK April 2014 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... ! a.o. there is a diode connected towards the yellow output ... 'isolate' when connected to wrong polarity.
    roko roko October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... a digital meter with a diode test range?

    If ... (two terminals or leads, connection polarity not important)
    + positive DC ...
    1024MAK 1024MAK November 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... , actually have a different polarity on their meter leads than ... black lead becomes the positive polarity and the red lead ... becomes the negative polarity.

    To test a diode, switch to ... digital meter, except the different polarity of the leads, and ...
    1024MAK 1024MAK November 2015 Hardware
<1234567…34>

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Related Threads

  • Spectrum 48K and wrong power supply polarity!!!Hello,<br /> I need a help fixing my Spectrum 48K, motherboard issue 4B. Since I'm in Canada, I couldn't use standard spectrum power supply, so I che…
  • BA157 diodeUsed in Speccies, so not too off topic :P<br /> <br /> Right, it's a "fast recovery rectifier diode" - can anybody tell me what that means exactly? …
  • PSU polarityHi!<br /> I have a speccy+ psu and somewhere there is a loose connection.I suspect the end to the speccy side.<br /> I need to cut the wire and put a…
  • Sinclair FTV1 - Power supply polarity?I've just dug out my old Sinclair FTV1 pocket telly.<br /> <br /> Does anyone know the polarity of the power supply requirements, before I plug it in…

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