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  • What is this disk interface (and how to use it)?Anybody seen this floppy disk drive interface before? It uses an MB8877A and the rest is 74XX-logic, no GALs/PALs. And an EPROM. [IMG]http://i1373.p…

    ... in order to convert the voltage down to like 10.8V ... actually looks like the cooled 7805 on that PCB does the ...
    georgedb georgedb August 2014 Hardware
  • Best version of SE Basic for use in real 48K machineAs title really. :) I did a search but I'm still confused a bit. :( I've seen a few versions, namely 'SE Basic 0.80a' which has the nice 'bar' abov…

    ... can I get a 7805 (7905?) direct DC regulator to do away ...
    spider spider August 2014 Hardware
  • 48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…

    ... took some voltages around the 7805 regulator and the positive end of ...
    retrogamemart retrogamemart September 2014 Hardware
  • PlusDlite v2014.1 - problems with floppy power supplyI received a small batch of boards of the new PlusDlite design, which is similar to the original PlusD, with GAL etc. The main differences with the o…

    ... note that I removed the 7805 from that clone, and feed ... google a bit for similar (voltage level?) problems with two power ...
    bverstee bverstee September 2014 Hardware
  • How important is the 9V line?I'm in the middle of resurrecting an Opus Discovery. The transformer is gone so Im using a small switched mode PSU from a PC. My plan is to bypass …

    ... rectifier connecting to the 5v regulator also runs to the 9v ... />
    How critical is the voltage on the 9v line to ...
    rune rune October 2014 Hardware
  • ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…

    ... circuit board that houses the voltage converter circuit (top right) had ... /> Measuring the outputs of the voltage converter circuits in both Spectrums ... have a diagram of the voltage converter circuit to hand while ...
    Zorn Zorn November 2014 Hardware
  • Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…

    ... even warm. I checked the 7805 regulator under power - it wasn't ... I have ordered a new 7805 in the hopes that it ...
    Neosodium Neosodium January 2015 Hardware
  • My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…

    ... a transformer lowering the voltage and a linear regulator based on uA723 ... equivalent with current limiter and an over-voltage ... output in case of over-voltage blowing up the fuse.
    brian-82 brian-82 August 2015 Hardware
  • Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…

    ... swapped the burnt-out 7805 for a switched regulator. Now I get ...
    namtip namtip November 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... hot.

    The voltage from the 7805 seems fine. Possibly CPU ...
    Jet5y Jet5y December 2015 Hardware
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... the electrolytic capacitors and the 7805 (the original had some broken ... when the fault occurs, the voltage at this point does not ...
    Zorn Zorn February 2016 Hardware
  • 48K Issue 6a wobbly and flickering TV outputHi folks, Found an untested issue 6A Spec whilst tidying up and it had a warranty sticker on it from a past repair which seemed to be a socketed L…

    ... can I swapped the 7805 for a switching regulator (Tracopower). Fed it ...
    witchy witchy July 2016 Hardware
  • bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…

    ... following:
    * observing the 5V voltage -> obviously ok
    * ... Finally I removed the 5V regulator cable from its socket and ... so I changed the 5V regulator and also the electrolytic ... transverter while using the 5V regulator -> Buzzsasw did run ...
    ingo ingo November 2016 Hardware
  • Character wobbleHello, I have an Issue 2 board which shows vertical character wobble. This happens for a few minutes followed by a few minutes of character sta…

    ... with a
    Murata switching regulator. All power rail voltages are ... a possibility that the excess voltage may have
    damaged the ... 're pretty robust and the voltage
    wasn't that much ...
    roganjosh roganjosh December 2017 Hardware
  • General PSU repair guidesNot Speccy related. I'm just looking for a guide as such as to where to begin with a power supply repair. Realise this is a bit of an odd thing to as…

    ... and something like a 7805/7812 etc regulator, aside from fuses that ...
    spider spider August 2020 Chit chat
  • 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…

    ... , i have changed the -12v regulator (79L12) no change then i ... that there is no input voltage .. any suggestions / power supply info ...
    mark8bit mark8bit November 2020 Hardware
  • Voltage/current meterToday I went to my local electronics shop and found this model of voltage and current meter, readily assembled with DC plugs at either ends... :P …

    ... and found this model of voltage and current meter, readily assembled ...
    Renegade Renegade December 2021 Hardware
  • blew up my 128i did it - damn. i accidentally reverted the polarity of the power power supply, so ended up with a blown 5v stabilizer, which i replaced, but there …

    ... the regulated 5V, and the 7805 regulator got blown first - i thought ...
    mark mark December 2001 Sinclair Miscellaneous
  • blew up my 128i did it - damn. i accidentally reverted the polarity of the power power supply, so ended up with a blown 5v stabilizer, which i replaced, but there …

    ... the polarity this destroy the regulator (7805) but pobably don't cause ...
    Anonymous Anonymous December 2001 Sinclair Miscellaneous
  • ObituaryYesterday my spectrum died :( Over 7 years of faithful service its finally gone to Silicon heaven. Rest in peace spectrum 48k+ Born sometime in 198…

    ... be down - there is a 7805 regulator in there which converts the ...
    GP GP December 2002 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... power supply failure or the 7805 regulator has gone kaplowie or something ...
    Spirantho Spirantho May 2005 Sinclair Miscellaneous
  • Powering a SpectrumNow I've got my DivIDE up and running (and it's totally brillant, I encourage [B]everyone[/B] to get one), can I use the power supply from an old PC …

    Most regulator (the 7805 in Speccy included) can actually ... connect that instead of the regulator at all? Again, I've ...
    Spirantho Spirantho September 2005 Sinclair Miscellaneous
  • Powering a SpectrumNow I've got my DivIDE up and running (and it's totally brillant, I encourage [B]everyone[/B] to get one), can I use the power supply from an old PC …

    ... the internal regulator.

    Also, the higher the voltage supplied to ... the internal regulator the hotter it ... it with a switch-mode regulator which wouldn't suffer so ...
    Laser Laser September 2005 Sinclair Miscellaneous
  • How do you get an external tape recorder to work on a +2a?Just for the hell of it, just say the internal cassette player stopped working. What command would you use when hooking up an external player, so the…

    ... just need to use a 7805 regulator. With one of these, it ...
    DEATH DEATH January 2006 Hardware
  • Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…

    Cheers for that. I'm a little surprised the 7805 wasn't more frequent as my own Speccy blew two up.....I wonder if there was some other problem like too high a voltage from the transformer...(?)
    xenomorph xenomorph May 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…

    ... pretty close to the regulator's output voltage, minus half a volt ... due to the output trannies voltage drop. If this is important ... diode) will raise the output voltage by the right amount. Depending ...
    DEATH DEATH February 2007 Hardware
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... how to solve the different voltage problem.[/quote]

    Hmmm ... even remove the 5V serial regulator in the Speccy and replace ...
    Marcelo Marcelo March 2007 Sinclair Miscellaneous
  • +3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …

    ... and you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ...
    DEATH DEATH March 2007 Hardware
  • +3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …

    ... and you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ...
    rwap rwap March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    Not well regulated, at least! Most 5v stuff has an absolute maximum rating of 5.25 volts. Unfortunately, 5.4v isn't quite enough to be regulated spot-on by an inexpensive 7805 (which requires a minimum input voltage of 7v)
    Winston Winston March 2007 Hardware
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