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<1234567…34>
  • +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
  • 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 : …

    ... have snipped out the -5V decoupling caps for the RAM, just ... circuit must be working as +12V is fine, though comparing to ...
    prime prime July 2012 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
  • 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…

    ... on and measured the voltages, 12v was giving me an extreme ... on with the ram removed. 12V line was fine with a ... the picture. Looked at the 12v line and there is a ... lower ram ic's the 12v line is ok but when ... causing the instability in the 12v line, it's ruining the ...
    patzik patzik April 2016 Hardware
  • Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…

    ... s just not that many decoupling capacitors on this board and ... minimal and somewhat poorly placed decoupling (the EPROM and the main ... and should have good local decoupling. And this is only a ... be attributed to power supply decoupling issues?

    I ...
    msansom msansom March 2017 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
  • PSU queryHi all, just one quick question. Are Spectrum PSU's compatible with ZX81's? I've just bought an '81 off of Ebay, which was sold as "working, but the …

    ... the 5V supply to make 12V and -5V, in a similar ... directly connected to the 4116 +12V power pin, with no regulation ... converter. I've added one decoupling capacitor on this line to ...
    Gods Gods July 2008 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... most of the (22 nF) decoupling capacitors that go with them ... acts as filter for the ~12V video DC supply, and extra ... ). If you're touching any decoupling capacitors: better replace 22nF with ...
    RetroTechie RetroTechie April 2010 Hardware
  • Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …

    ... Z80's A0 line and +12V. Indeed the repair guide (page ... 4.5) says 12V, where I think +5V should ... patch using 5V instead(!) of 12V, R=3K9, just for noticing ... ) capacitor seems to add some 'decoupling', should not change the workings.
    roko roko July 2010 Hardware
  • Recapping your SpeccyHas anyone ever done it? I have several vintage amps, tuners, cassette decks that have been recapped. So just wondering are there many on WOS who ha…

    M1 is next to '12V unregulated' so the slightest misalignment ... . The other neighbour of '12V unregulated' is '12V'.
    When I started ... interested in that fact...
    Decoupling (filtering) capacitors can easily be ...
    roko roko October 2010 Hardware
  • 48K Issue 3, noisy display.Has anyone here experienced and been able to resolve a problem that looks like this: [URL="http://drizzle.zigg.net/ZX/ZX106-display.jpg"]Photogra…

    I have seen this on issue3. IIRC it had to do with decoupling the +12V line that feeds LM1186. Check the new capacitors?
    roko roko February 2012 Hardware
  • 48K Issue 3, noisy display.Has anyone here experienced and been able to resolve a problem that looks like this: [URL="http://drizzle.zigg.net/ZX/ZX106-display.jpg"]Photogra…

    ... it had to do with decoupling the +12V line that feeds LM1186 ...
    roko roko February 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 : …

    ... there maybe isolate the two 12v lines as well.

    decoupling cap is not going to ...
    IN31 IN31 July 2012 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... supply is active and all decoupling capacitors present in that rail ... internal converter, begins to generate 12V and -5V supply rails to ...
    mcleod_ideafix mcleod_ideafix June 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…

    ... 16V rated caps, in a 12V you put 35V caps etc ... . In digital circuits, most are decoupling or noise-suppression capacitors, so ...
    skagon skagon November 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…

    ... behind and scaremongering?

    12v with respect to what, and ...
    Finally, since you ask, 12V with respect to the 5V ... computer's ground plane to +12V, even momentarily the ground ... as a "wavebreaker" is the decoupling capacitor near each IC, all ...
    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…

    ... of +5 and +12V will be +5 and +12V ABOVE whatever the ... overcome the ability of the decoupling capacitor to supply enough current ... supply by shorting it to +12v, I will cook and eat ...
    Winston Winston December 2013 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... could try replacing the small decoupling capacitors (the resistor shaped ceramic ... at least the +5V and +12V supply tracks.

    [B ...
    1024MAK 1024MAK January 2014 Hardware
  • IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…

    ... logic can help. Are decoupling capacitors sufficiently close to power ... pins? Are the decoupling capacitors sufficiently low ESR and ... datasheet or app notes on decoupling?[/QUOTE]

    - Ground ... supplied with +5V, -5V and +12V from a PC PSU), just ...
    Dan Antohi Dan Antohi January 2014 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... four capacitors that "decouple" the +12V supply (C5 to C8 on ... LRRM does not use the +12V supply or the -5V supply ... "normal preferred value" for a "decoupling" capacitor. A 47nF ceramic disc ...
    1024MAK 1024MAK August 2014 Hardware
  • 48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…

    ... board. (improves filtering of the 12V supply to PAL encoder)
    - Replace C1-C8 (lower 16k decoupling) with good quality 0.1 ...
    Tuukka Tuukka September 2014 Hardware
  • 48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…

    ... /> C44 is the RAM 4116 +12V.

    Measurements are taken ... .

    3) Decoupling better the 4116 +12V line is the way ...
    Falco-F8L Falco-F8L September 2014 Hardware
  • 48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…

    ... ripple and noise on the +12V (and-5V) lines:
    [ ... filtering and high frequency decoupling of the +12V supply to the 4116 ... DRAM. The +12V supply is the main supply ... multilayer ceramic capacitors, as more decoupling helps.

    100nF ...
    1024MAK 1024MAK September 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... idea how you are getting -12V :-o

    If there ... the coil, the voltage on +12V line will either fall to ... />
    Supply voltage testing on decoupling electrolytic capacitors:-
    For the ... C34 (22uF)
    For the +12V use C44 (100uF)
    For ...
    1024MAK 1024MAK November 2014 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    Best thing I found for reducing video interference was replacing C5 to C8 (the 12v decoupling caps for the lower RAM) with 1nf ceramics. On mobile at the moment, but if you search my post history you'll find it :)

    B
    balford balford December 2015 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 -> 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 …
  • 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…
  • Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…
  • 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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