World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.010s
<1234567…34>
  • 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…

    ... The area of circuit board that houses the voltage converter circuit (top right) ... and re-assembled the circuit one component at a ... the outputs of the voltage converter circuits in both Spectrums ... a diagram of the voltage converter circuit to hand while thinking ...
    Zorn Zorn November 2014 Hardware
  • Voltage converter question.I recently paid over $100 for a really solid nice looking 750 watt 110v to 220 v converter so that I can run some my UK appliances when they come ove…

    ... 110v to 220 v converter so that I can ... 500 Watt 110v to 220v converter going for $10. ...
    However, this second 'cheapo' voltage converter does not appear to have ... the chassis of the converter, and the ground pin ... side effects with the voltage converter?
    Scottie_uk Scottie_uk September 2013 Chit chat
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... that are related to the voltage converter circuit (I'd just replace all ... if you're sure the circuit is generating +12V.
    Zorn Zorn January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    I've seen that many times. My experience has been that it's always due to one or more faulty 4116 DRAM ICs, so no surprise there.

    What did you find to be wrong with the voltage converter circuit?
    Zorn Zorn January 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... also a problem with the voltage converter circuit or power supply connections to ... cause of the Issue 2 voltage converter circuit failing. If that has happened ... ; the little + symbol on the circuit board is on the wrong ...
    Zorn Zorn February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... meter readings within the voltage converter circuit. It's much more ... suggest that either the voltage converter circuit is faulty or one ... useful to take a voltage reading there (unless ... concentrate on getting the voltage converter working properly and finally ...
    Zorn Zorn February 2012 Hardware
  • TR4 is goneMy TR4 transistor is burned. Can I replace this transistor with a TIP31B or C ? My 4116 RAM ic?s are showing +0.05V, +5V and +8.49V... :) My Spectru…

    ... output of the voltage converter circuit cannot reach its intended voltage. This is quite ... something that connects between that voltage rail and 0V has gone ... supply tracks and get the voltage converter circuit working first.
    Zorn Zorn April 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... probably a fault in the voltage converter circuit and probably one or more ... from the board), repair the voltage converter circuit and re-connect/re-install ...
    Zorn Zorn May 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... part of a DC-DC converter circuit that generates the 12V and ... the transformer) with an alternative voltage converter circuit. The most obvious choice would ... a traditional switching DC-DC converter. I.e. some version of ...
    Zorn Zorn May 2012 Hardware
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    [QUOTE=guesser;720890]It's also hard to tell from the photo but it looks to me like there's a radial capacitor bodged on too.[/QUOTE]

    That appears to be the standard, Sinclair recommended modification to the issue 2 voltage converter circuit.
    Zorn Zorn September 2013 Hardware
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    [QUOTE=Zorn;720898]That appears to be the standard, Sinclair recommended modification to the issue 2 voltage converter circuit.[/QUOTE]
    Ah, right. Again though that indicates that it's possibly been repaired/upgraded.
    guesser guesser September 2013 Hardware
  • Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…

    ... output, then you know the voltage converter circuit is operating and producing 12 ...
    Zorn Zorn March 2014 Hardware
  • Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …

    ... be essential, but sometimes the voltage converter circuit fails because of a bad ...
    Zorn Zorn March 2014 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... V supply and so the voltage converter circuit will be more lightly loaded ...
    Zorn Zorn March 2014 Hardware
  • Simple Question! RAM InterfaceI was messing around on my spectrum yesterday and blew it up! Im sure it has to do with the RAM joystick interface I bought but hadn't tested. Is the…

    ... TR4 in the Spectrum's voltage converter circuit has failed. It is also ... until any fault in the voltage converter circuit has been corrected. Other faults ...
    Zorn Zorn June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... some other component in the voltage converter circuit is faulty (it'd be ...
    Zorn Zorn June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... some other component in the voltage converter circuit is faulty (it'd be ...
    Brian Brian June 2014 Hardware
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... generated by a simple switching voltage converter circuit. I don't know whether ...
    Zorn Zorn August 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... correct?

    If the voltage converter circuit is oscillating, then TR4 & ...
    Zorn Zorn August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... you have something like the voltage levels you should have, ... RAM - this means the voltage converter circuit based around TR4 is fine ... the voltages you expect. Assuming voltage levels are ok now, ... splash giving a partial short circuit.

    If it ...
    DEATH DEATH August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... you have something like the voltage levels you should have, ... RAM - this means the voltage converter circuit based around TR4 is fine ... the voltages you expect. Assuming voltage levels are ok now, ... splash giving a partial short circuit.

    If it ...
    Spekkie Spekkie August 2014 Hardware
  • Hot plugable edge connector?Could the spectrum's edge connector have been made hot plugable without adding much to the manifacturing costs? I was thinking along the lines of a…

    ... and that either kills the voltage converter circuit (and so destroys the lower ...
    Zorn Zorn September 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…

    ... constant) 5v.

    The voltage converter circuit then generates -5v and +12v ... the unregulated voltage is not too high - otherwise the oscillator circuit stops ...
    balford balford January 2015 Hardware
  • Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…

    ... caused by failure of the voltage converter circuit.

    Start off by ...
    Zorn Zorn January 2015 Hardware
  • Zx spectrum 48+ help pleaseI have just had a look at my spectrum 48+ and I get this [IMG]http://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-xfa1/v/t34.0-12/10965632_101526175830…

    ... RAM ICs or because the voltage converter circuit has failed.

    Start ...
    Zorn Zorn February 2015 Hardware
  • TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…

    The issue 4S circuit board caters for two different ... overloading the output of the voltage converter circuit (most likely a failed 4116 ...
    Zorn Zorn February 2015 Hardware
  • TR4/TR5 replacementHi guys, I've got another Spectrum I'm working on now - an Issue 4S this time. When I originally got it, I powered it up and did the basic tests a…

    ... =Zorn;819524]The issue 4S circuit board caters for two different ... overloading the output of the voltage converter circuit (most likely a failed 4116 ...
    Tekno Venus Tekno Venus February 2015 Hardware
  • not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …

    ... other components in the voltage converter circuit have failed, though TR4 ... checking the diodes in the voltage converter circuit too.

    voltage converter circuit.
    - Check ... supply rails with them in circuit.

    ...
    Zorn Zorn July 2015 Hardware
  • video quality issue on 48k machine after composite modHello! I just bought an 48k spectrum and did the composite mod. Unfortunately it did not end up as good as i hoped for. The screen after reset looks …

    ... bad caps, especially in the voltage converter circuit which can kill RAM if ...
    balford balford November 2015 Hardware
<1234567…34>

Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21

HitBox

Word Docs Hits
voltage 2.8K 4.5K
converter 1.8K 2.4K
circuit 4K 5.5K

Related Threads

  • 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…
  • Voltage converter question.I recently paid over $100 for a really solid nice looking 750 watt 110v to 220 v converter so that I can run some my UK appliances when they come ove…
  • Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
  • SpeccyBob circuit diagramsI've had quite a few requests for this lately, so I've decided to put the circuit diagrams for speccybob on my site in their original Protel format:<…
  • Tap to SNA batch converterHi guys, i was wondering if there was a util DOS or Win based for batch converting Tap files to Sna files.<br /> <br /> I know some Emulators can do …
  • Z80 to TZX Converter !Hey Everyone !<br /> <br /> I have a bit of time lately and I coded a little utility that can convert the Z80 snapshot (any version, 48k and 128k sup…
  • circuit boards?Supoosing one was in desperate need of an upgrade, and supposing one found some schematics on the net for a floppy interface, and an IDE interface, h…
  • Short circuit (part 2)In SC part 2, the screen scrolls to the right and you have to jump over obstacles, avoid animals, etc.<br /> <br /> My question is....<br /> Does thi…
  • Proface AT internal circuit request (pin outs)Does anyone has the circuit of the interface as I have lost mine and I cannot connect it to my speccy.
  • Short CircuitDoes anyone know if the second part of this game has an end or does it just go on and on?

Related Searches

  • kempston interface circuit
  • interface 1 voltage
  • currah micro source circuit diagram
  • rgb voltage
  • scr png converter
  • high voltage
  • clock conditioning circuit
  • clock circuit
  • spectrum 128 tape recorder circuit diagram
  • spectrum 2 128k tape recorder circuit diagram
  • spectrum 2 tape recorder circuit diagram
  • spectrum 128k 2a tape recorder circuit diagram
  • spectrum 128k tape recorder circuit diagram
  • spectrum 2a tape recorder circuit diagram
  • recorder circuit diagram
  • tape voltage
  • php scr converter
  • ram voltage
  • ram and voltage
  • short circuit

Copyright © 2024 World of Spectrum