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Search Again :: Adv Search 276 results in 0.000s
<1…45678910>
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... the peaks of the rectified waveform.

    P.S. Unrelated ...
    Zorn Zorn July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... use a full bridge. The waveform as seen on a scope ... is the integral of the waveform. With no load, the blue ...
    Pierre Pierre July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... (equivalent to the peak ac waveform from the transformer).
    If ... or a sine-wave type waveform.
    RMS multimeters are more ...
    1024MAK 1024MAK July 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... generates a type of AC waveform at the collector of TR9 ... positive part of this AC waveform through to diode D20 and ... . So when the negative AC waveform occurs, D19 becomes forward biased ... positive AC cycle, the AC waveform from T1 and the charge ...
    1024MAK 1024MAK August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... state error in the sync waveform, I'm hoping I'll ...
    GoingDigital GoingDigital August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... have a look at the waveform. That'll settle it once ...
    balford balford August 2013 Development
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... the audio mirrors the tape waveform exactly.

    Biphase Mark ... rate needed to represent the waveform. I think thats an issue ...
    GoingDigital GoingDigital September 2013 Development
  • spectrum issue 6a oddityMorning everyone Bought a speccy (rubber key) from ebay in near mint condition - couldn't tune in on analogue particularly well so did the comp mod …

    ... case where viewing the video waveform with an oscilloscope would be ...
    Zorn Zorn September 2013 Hardware
  • spectrum issue 6a oddityMorning everyone Bought a speccy (rubber key) from ebay in near mint condition - couldn't tune in on analogue particularly well so did the comp mod …

    Which terminal of the transistors did you measure? The base?
    You are aware that a video signal is a complex waveform and that the reading given by a meter depends as much on the meter as the measured signal?

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK September 2013 Hardware
  • 128K RGB Display problem.I have just got my hand on a toast rack, but when powered and connected to the telly the picture jumps horizontally at random intervals. Could it be…

    ... due to the mains AC waveform "breaking through" to the Spectrum ...
    1024MAK 1024MAK December 2013 Hardware
  • Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…

    ... composite sync as a video waveform and trigger off it as ...
    guesser guesser December 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... bridge which rectifies an AC waveform). My Fluke is also now ...
    Pierre Pierre January 2014 Hardware
  • New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…

    ... useful on an oscilloscope (the waveform looks pretty much identical before ...
    Winston Winston January 2014 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    ... measures the integral of the waveform and not the peak values ... the level is and the waveform.

    I posted in ...
    Pierre Pierre March 2014 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    Like Pierre says, what you read has a relation with the waveform, which here is the AC ripple left on the DC after rectifying and smoothening.
    So this would be an interesting case for exchanging the capacitor (or set of 2 caps) inside the adaptor.
    roko roko March 2014 Hardware
  • PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…

    ... the rectifier diodes. The resulting waveform is now described as having ...
    1024MAK 1024MAK March 2014 Hardware
  • Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…

    ... a subroutine to output one waveform for each volume level and ...
    Alcoholics Anonymous Alcoholics Anonymous March 2014 Development
  • Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…

    ... card input to see the waveform.
    RobeeeJay RobeeeJay March 2014 Development
  • Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…

    For sound purposes, it's pretty much enough to look at the waveform in a standard wave editor.
    The core of my routine is more or less done actually, but there are a few unresolved issues with the framework, ie. how to update note data pointers etc.
    utz utz March 2014 Development
  • Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…

    ... , no longer 50%. So your waveform might change to 11101110 0000 ...
    Alcoholics Anonymous Alcoholics Anonymous March 2014 Development
  • Why didnt 48k ingame music work?There were very few games that had ingame 48k music, a couple I can think of were Kung Fu Master and Manic Miner but it always sounded drained and no…

    ... to make a (crude) AC waveform to drive the speaker (think ...
    1024MAK 1024MAK April 2014 Hardware
  • Why didnt 48k ingame music work?There were very few games that had ingame 48k music, a couple I can think of were Kung Fu Master and Manic Miner but it always sounded drained and no…

    ... ULA to make an AC waveform to drive the speaker.
    The Starglider The Starglider April 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... a 'scope to examine the waveform on the address pins and ...
    1024MAK 1024MAK April 2014 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... 2.
    But the output waveform is garbage.


    bverstee bverstee May 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... overdrive and therefore "clip" the waveform.

    I had ... problems: a change of waveform shape and a delayed signal ... If you look at the waveform picture that I posted, you ... matter.

    In the waveform diagram:
    Green = simulated poor ...
    1024MAK 1024MAK June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... that looks like a triangle waveform and signals that are outside ...
    1024MAK 1024MAK June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... , keep in mind that this waveform image:

    [IMG]https ... (clock_in) {green coloured}[/B][/COLOR] waveform is just an approximation of ... create an even better output waveform.

    Of course, I ...
    1024MAK 1024MAK June 2014 Hardware
  • Spectrum Sound Effects in Star Trek IV: The Voyage HomeRecently, I was watching Star Trek IV: The Voyage Home and there was a scene where it sounded as if a Speccy sound effect was being used very subtly …

    ... are going with the ole waveform analysis, however the amplitude at ...
    sj_howlett sj_howlett June 2014 Sinclair Miscellaneous
  • Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…

    ... positive going part of the waveform). Hence the term "ripple", which ...
    1024MAK 1024MAK August 2014 Hardware
  • Spectrum & ZX81 PSU Strange VoltagesHi all I've just refurbished my ZX spectrum PSU after i accidently broke one of the wires i soldered the joints to the PCB nicely and all seems to b…

    ... unit is actually a mixed waveform. It is DC, but with ... that you get with any waveform. Its value is equivalent to ... (the maximum voltage that the waveform gets to).

    Cheap ... on the assumption that the waveform is a sine wave. But ...
    1024MAK 1024MAK August 2014 Hardware
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