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<1…18192021222324…34>
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... internal switching transformer, and the 7805 regulator, so he can feed 5V ...
    mcleod_ideafix mcleod_ideafix April 2010 Hardware
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... internal switching transformer, and the 7805 regulator, so he can feed 5V ...
    Valentin Valentin April 2010 Hardware
  • component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…

    ... internal switching transformer, and the 7805 regulator, so he can feed 5V ... ZX48K not complete, but the 7805 is now only hand warm ... is to take a modern 7805. This item needs no heatsink ...
    -Micky -Micky April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    ... ]Control the soldering from the 7805. Because the heatsink can damage ... /> Or a leg from the 7805 has a very fine broken ... on the heatsink. Change the 7805.


    Micky[/QUOTE ... ]

    Thanks Micky. The 7805 being the regulator I presume?
    Alien 8 Alien 8 April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    [QUOTE=Alien 8;439146]Thanks Micky. The 7805 being the regulator I presume?[/QUOTE]Yes.


    Micky
    -Micky -Micky April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    Make a test and touch the heatsink and the regulator. Move the finger something. If the ZX then crashes it is the 7805. If not then I guess it is the keyboard membran.


    Micky
    -Micky -Micky April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    ... touch the heatsink and the regulator. Move the finger something. If ... then crashes it is the 7805. If not then I guess ... another thread that a new 7805 doesn't even need a ...
    Alien 8 Alien 8 April 2010 Hardware
  • My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …

    ... [/URL] regulator, and input a [I]regulated[/I] DC voltage that's ... just high enough (around 6~7V depending on regulator ... hard-pressed TR4/5 switching regulator to work a little harder ...
    RST#08 RST#08 April 2010 Hardware
  • Alternative speccy power supplysI know all us would have our speccys with the original power supply,but often i would see a distress call from people who got speccy from ebay but on…

    ... with at least a blown 7805 (in 16/48K spectrums ... it.

    - Voltage: 7805 need at least 8 volts ... to regulate voltage, so anything from 8 ... the "extra" voltage is drawn from the 7805 as heat, so ... more heat... and the 7805 and the keyboard membrane ...
    Zup Zup May 2010 Hardware
  • DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…

    ... right direction to replace the 7805 regulator in a issue 3 48K ...
    Alien 8 Alien 8 June 2010 Hardware
  • 7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…

    ... in replacement part for a 7805, or are further parts required ... to be 2A - perhaps the voltage begins to sag once you ...
    Winston Winston June 2010 Hardware
  • 7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…

    ... to be 2A - perhaps the voltage begins to sag once you ... ? Thanks Winston, looks like a 7805 it will be then.
    Alien 8 Alien 8 June 2010 Hardware
  • 7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…

    ... that work then? cause the regulator still has to waste the ... [/URL] housing? Better regulator-heatsink contact -> regulator temperature closer to heatsink ... long as regulator+heatsink combo is up to the job), 7805's ...
    RetroTechie RetroTechie June 2010 Hardware
  • Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…

    Is it the 7805 regulator that you are talking about ...
    FuzzySpace FuzzySpace August 2010 Hardware
  • Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…

    ... =FuzzySpace;462059]Is it the 7805 regulator that you are talking about ... /> No, it's not the 7805. The computer shows signs of ... as a result of the 7805 being replaced badly.

    Alien 8 Alien 8 August 2010 Hardware
  • Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …

    ... there to get a smooth voltage from the transverter formed by ... higher capacitance and a maximum voltage ov 16 V or higher ... for use in a switching regulator. It is a very cheap ...
    ingo ingo August 2010 Hardware
  • Maximum number of Spectrum devicesHi! What is maximum number of devices i can connect to my rubber key Spectrum? Is there somekind of limit? Now i have Interface 1, Microdrive, Zx p…

    ... .[/QUOTE]

    The internal 7805 regulator offers only 1 Ampere (5 ... for example has its own 7805, so it does not use ... the 7805 with a 3 Ampere or 5 Ampere type regulator, but ...
    LCD LCD September 2010 Hardware
  • Help with broken QLHi, I picked up a QL recently but find that after a while the keyboard stops responding. Any ideas what could be wrong? Thanks

    ... need to just replace the 7805 regulator where the power comes into ... around the heatsink - is the 7805 screwed into the heatsink properly ...
    rwap rwap September 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... , but still no signal
    regulator out voltage = 4.99 volts
    ZXZaber ZXZaber October 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... still no signal
    regulator out voltage = 4.99 volts[/QUOTE]
    regulator", I assume it's a ... -SCART cables use the +12V voltage to switch the RGB function ... . So check first the +12V voltage.
    mcleod_ideafix mcleod_ideafix October 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…

    ... /> Also can't tell whether regulator says 7805 or 7809... :grin:
    RetroTechie RetroTechie November 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…

    [QUOTE=RetroTechie;489308]Also can't tell whether regulator says 7805 or 7809... :grin:[/QUOTE]
    Looks like 7809 to me...;)
    Gods Gods November 2010 Hardware
  • Powerpack melts! +3 survives!I woke up this morning, switched on the sockets, went to the loo 'as you do' and came back into the living room. I heard this clicking sound so I th…

    ... guess that the 5V linear regulator let out the magic smoke ... result is some rather high voltage ending up where there should ...
    Winston Winston November 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... than not).
    [*] Replace 7805 with efficient switching regulator & minimize / remove ...
    RetroTechie RetroTechie December 2010 Hardware
  • Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…

    [QUOTE=mcleod_ideafix;502672]An integrated regulator is not like a capacitor: ... be replaced if the output voltage is lower than 4.8V ...
    gtsamour gtsamour January 2011 Hardware
  • Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…

    ... replace with at least 2A regulator. Only exception would be if ... pictures, there's a regular 7805 (1A). Here it is [URL ... my QLs only different brand 7805 (MC: Microcirquit)

    The ... QL service guide : 78S05 2A regulator can be used, but hardly ...
    gtsamour gtsamour January 2011 Hardware
  • +2 grey 5v reg pinoutjust a quickie, had to buy a new 5v reg for the grey, now i cant remember which wire went to which pin! got brown red and black, im guessing the blac…

    ... not a regular 7805 regulator (1A) but a 2Amp 7805 (meaning a [B ... /> Take into consideration that the regulator should be able to supply ...
    gtsamour gtsamour January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... require etc. Most significantly, the 7805 regulator is barely enough to power ... than a simple transformer and 7805 regulator. (SMPS that have to ... - indeed, apart from the 7805 the ULA is the only ... could use a beefier linear regulator, you now need a much ...
    Winston Winston January 2011 Hardware
  • ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…

    ... obvious when I removed the regulator board to take a look ... bad capacitors leading to poor voltage stability (the only way of ...
    Winston Winston January 2011 Hardware
<1…18192021222324…34>

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