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Search Again :: Adv Search 1000 results in 0.002s
<1234567…34>
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…

    ... and measured the voltages, 12v was giving me an extreme ... with the ram removed. 12V line was fine with ... the 12v line and there is a light blur (ripple) to ... 12v line is ok but when inserting the last few the ripple ... the instability in the 12v line, it's ruining ...
    patzik patzik April 2016 Hardware
  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector? Firstly, if they use +9v they won't work on a +3, since the +3 does…

    Do any peripherals use the +12v, -12v or 9v lines exposed at ... traces down to pass the +12v/-12v through, so I'm looking ...
    Winston Winston March 2008 Hardware
  • 12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…

    I found this simple dc-dc converter:
    [url]http://www.mcrent.com/workbench/dcdc1216/[/url]
    it converts 12V to 16V, can it be used to produce 9V by modifying R1 and R2?
    is there some better solution?
    orange orange October 2012 Hardware
  • Spectrum +2 grey 12v railHello everyone, I have this grey +2 with no video from tv. After much reading and testing i realized it was the internal power supply. At the 12v ra…

    ... internal power supply. At the 12v rail to tea2000 and serial ...
    palex palex November 2012 Hardware
  • 12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :( I do however have a 12v 2amp PSU, if I reverse the polarity so t…

    ... /> I do however have a 12v 2amp PSU, if I reverse ...
    stu232 stu232 April 2014 Hardware
  • 12V Rail - Spectrum 48kOkay - I may just be having a senior moment here, but I'm running out of ideas. I'm working on a Spectrum Issue 4S board,and have had to remove al…

    ... -5V are fine, but the 12V rail is at almost 25V ... , and the rail there was 12V as expected.

    Has ...
    Graham Graham November 2015 Hardware
  • Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…

    ... at 5.1V & 12V with no ripple (didn't measure the ...
    Shockwav3 Shockwav3 November 2015 Hardware
  • Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…

    ... on the TEA2000 12V input with no obvious ripple.
    - diodes D1 ...
    pdj102 pdj102 September 2016 Hardware
  • ZX Spectrum Issue 2 - 12V badHey there, I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. Overall the machine was generally working when I recieved it, bu…

    ... vertical lines. Turned out the 12V line is bad (along with ... (eliminating the need for -5V/-12V) according to this http://www ... cathode of D15 and feed 12V with a second PSU. However ... D15 soldered in place, the 12V line gets ~8.4V-8 ...
    Shockwav3 Shockwav3 December 2017 Hardware
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…

    ... are all right but the 12V line measures roughly two volts ... the other place that uses 12V is the LM1889, which is ...
    protek protek July 2020 Hardware
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

    ... +2A power supply that the -12v rail seems to be missing ... ok, i have changed the -12v regulator (79L12) no change then ... to the 5 volt and -12v rail ,,, confused.com
    i ... realize that the -12v is not strictly required for ...
    mark8bit mark8bit November 2020 Hardware
  • Spectrum +3 Powered off a PC???Hiya Quick question. Is it possible to power a +3 from a PC power supply? as in, make or buy an adaptor? or some other method. Want to mount a +3 …

    ... deal with the power ripple issues. The ripple problem was easy to ... supply puts out(+5v = 23a: +12v = 9a: on my supply) , so ... circuits in question use the +12v line.

    It's ...
    dasteph dasteph September 2005 Sinclair Miscellaneous
  • Noisy 2A displaymy 2A gives a fairly good display until it has to generate sound or other cpu work, which interferes with the signal, giving some "cloudy" effects …

    ... /25v capacitor with + on the 12v input and - to ground, before ... the 12v is input to the BC237 transistor. It's a ripple ...
    dasteph dasteph July 2006 Hardware
  • Noisy 2A displaymy 2A gives a fairly good display until it has to generate sound or other cpu work, which interferes with the signal, giving some "cloudy" effects …

    ... said that you had no ripple etc on the supply, but ... lines instead of just the 12v line.

    The +2a ...
    DEATH DEATH July 2006 Hardware
  • replacement +3 psuok, who would be kind enough to help an idiot build a replacement PSU for the +3 / +2a , from a PC power supply? Guesser has already helped out a gr…

    ... used capacitor ripple filters on both the 5v and 12v lines. See ... Spectrum with also employs the ripple filters, I didn’t muck ...
    dasteph dasteph September 2006 Hardware
  • replacement +3 psuok, who would be kind enough to help an idiot build a replacement PSU for the +3 / +2a , from a PC power supply? Guesser has already helped out a gr…

    ... 've never considered using a ripple filter on a PC supply ... /> I wouldn't have thought ripple would be a problem, especially ... reccomend? 2200uF @ 35V for the 12V line and the same cap ...
    DEATH DEATH September 2006 Hardware
  • replacement +3 psuok, who would be kind enough to help an idiot build a replacement PSU for the +3 / +2a , from a PC power supply? Guesser has already helped out a gr…

    ... ]I wouldn't have thought ripple would be a problem, especially ... idea for the filter. The ripple problem only became apparent because ... reccomend? 2200uF @ 35V for the 12V line and the same cap ... ] I used: 1 2200uf 25v @ 12v. 1 2200uf 16v and a ...
    dasteph dasteph September 2006 Hardware
  • Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…

    ... AT supply would need a ripple filter - I kind of ... supply...

    But a ripple filter is often merely a ... the low parts of the ripple from the rectifier (AC, ... 9v, and the PSU makes 12v, you can put the ... capacitor on the 12v output, then a 9v ...
    Winston Winston February 2007 Hardware
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... thinking that that regulator outputted 12v and 5.7v - two outputs ... a filter, to remove any ripple (an AC signal) on the ...
    DEATH DEATH July 2007 Chit chat
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... and C45.

    Ripple on the 12V line, caused by faulty ...
    Pilsener Pilsener December 2007 Hardware
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... is it supposed to be 12V ? The PSU to the speccy ... and C45.

    Ripple on the 12V line, caused by faulty ...
    Johan Johan December 2007 Hardware
  • Eprom blowerdoes anyone know a site with plans for an eprom programmer project that'll blow 27C256s. I attempted to build one called Kisseprom, but the software …

    ... written the time of the ripple).

    Conclusion : never use ... , use a PSU of 9-12V and set VCC to 6 ...
    gtsamour gtsamour February 2008 Hardware
  • Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …

    ... about 12V without load. At 2A there was a 100 Hz ripple ...
    ingo ingo May 2008 Hardware
  • +2 datacorder noise eliminationHello :-) I have recently bought a gray +2, and as expected, it is plagued with the "datacorder noise in sound output" problem. I have found a few …

    ... to avoid noise caused by ripple on the power (from motor ... stability. I myself use a 12V reed relais which works fine ...
    ingo ingo March 2009 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    [QUOTE=Valentin;439521]Speccy needs +12v for LM 1889 which is ... up to 18V), and a ripple voltage on unregulated DC supply ...
    RetroTechie RetroTechie April 2010 Hardware
  • Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…

    ... bathtub seems to generate enough ripple to to burn that out ... sure its between 9v and 12v and can supply upwards of ...
    spodula spodula February 2011 Hardware
  • 128K heatsink no color in composite video and bad antenna outputI am currently repairing a ZX Spectrum 128K heatsink model. It gives no colors on composite video output, and very bad antenna output. I opened it a…

    ... 's of parts that use 12V to ignore any faults in ... the 12V and 5V lines with a scope; only small ripple
    bverstee bverstee February 2012 Hardware
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... and C6 has significantly more ripple on it than any of ... other caps connected between the +12V (now +5V) and ground ...
    Johan1973 Johan1973 June 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 …

    ... .1V? Is there an undesired ripple? If possible change the 7805 ... new/different one. Is the 12V line ok? is it about ...
    ingo ingo August 2012 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... ][/U]

    As the +12V supply comes from a switch ... to remove the high frequency ripple. A filter is constructed using ...
    1024MAK 1024MAK March 2013 Hardware
<1234567…34>

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Related Threads

  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector?<br /> <br /> Firstly, if they use +9v they won't work on a +3, since…
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
  • 12V -> 9VI found this simple dc-dc converter:<br /> [url]http://www.mcrent.com/workbench/dcdc1216/[/url]<br /> it converts 12V to 16V, can it be used to produ…
  • Spectrum +2 grey 12v railHello everyone,<br /> <br /> I have this grey +2 with no video from tv. After much reading and testing i realized it was the internal power supply. A…
  • 12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :(<br /> <br /> I do however have a 12v 2amp PSU, if I reverse the p…
  • 12V Rail - Spectrum 48kOkay - I may just be having a senior moment here, but I'm running out of ideas.<br /> <br /> I'm working on a Spectrum Issue 4S board,and have had …
  • ZX Spectrum Issue 2 - 12V badHey there,<br /> I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. <br /> Overall the machine was generally working when I rec…
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

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