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<1…19202122232425…34>
  • Timex 1000 PAL conversionHi, a friend of mine sent me a Timex 1000 from the US. I was prepared for the NTSC/PAL issues so no surprise came to me when i got a shadowy dark scr…

    ... set and halves the output voltage (to avoid signal limitation if ...
    ingo ingo January 2009 Hardware
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... because the sound power is voltage^2 x speaker resistance or ...
    ingo ingo January 2009 Hardware
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... wave form, and producing that voltage. The beeper circuit is not ... value is turned into a voltage level), but a PDM DAC ... density is turned into a voltage level. PDM = Pulse Density Modulation ...
    Winston Winston January 2009 Development
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... approximations to model how the voltage change starts tailing off towards ... and bottom of the possible voltage range - see the scope output ...
    Winston Winston January 2009 Development
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... the beeper circuit creates a voltage level from the average over ...
    Winston Winston January 2009 Development
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... an inductor to drop the voltage. So if you're drawing ...
    Winston Winston January 2009 Hardware
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... (Regulated, 8.5V or Switched voltage) from Maplin? I could definitely ... provide whilst keeping a regulated voltage (2 Amps enough?) I could ... an inductor to drop the voltage. So if you're drawing ...
    BloodBaz BloodBaz January 2009 Hardware
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... divIDE+ because the 9V raw voltage (normally >11V) would be ...
    ingo ingo January 2009 Hardware
  • ZXCF conundrumsBefore I start spending time prodding my ZXCF, I ought to ask... Anyone else have problems with the ZXCF losing its memory between power cycles? I'v…

    ... jumper... You will have small voltage leak when Spectrum is on ...
    zboskovi zboskovi January 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... , full check of voltages, new voltage regulator, new membrane... Also added ... post/website on a better voltage regulator that can be used ... possible to add an additional voltage regulator in case one fails ...
    DEATH DEATH February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... ) to slowly increase the mains voltage to the Spectrum's power ... the Spectrum because the input voltage is lower so the regulators ...
    bladerunner bladerunner February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... better efficient, cooler running alternate voltage regulators, changing the electrolytic caps ...
    thomas3120 thomas3120 February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... better than 10V, because the voltage drop over the regulator would ...
    Pilsener Pilsener February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... better than 10V, because the voltage drop over the regulator would ... is about the minimum input voltage for reliable 5V output.
    DEATH DEATH February 2009 Hardware
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... silver thermal compound between the voltage regulator and 128k heatsink and ... 128k heatsink right where the voltage regulator mounts.

    I ...
    thomas3120 thomas3120 February 2009 Hardware
  • Keys don't work even with new membrane, HELP!Hi folks. I have a 1983 48k Zx Spectrum. It powers up fine, but none of the keys respond. I have tried fitting a new keyboard membrane from rwap, but…

    ... , but instead tell you the voltage drop, so be aware of ...
    Winston Winston February 2009 Hardware
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... ? the Z80? or for controlling voltage on start up?)
    BloodBaz BloodBaz February 2009 Hardware
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... need for some of the voltage circuitry - apparently.

    What ...
    dekh dekh February 2009 Hardware
  • Scary electric businessThe tranformer that supplies 12V to my monitor has started to leak. I suppose it's the capacitor inside. Should I hunt down a different one? Is it sa…

    ... feedback circuit that regulates the voltage. (I've had a PC ...
    Winston Winston February 2009 Chit chat
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... " Spectrum on a much lower voltage anyway, removing the existing rails ...
    BloodBaz BloodBaz February 2009 Hardware
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... ULA7, and improvement of the voltage convertor in 2 or 3 ...
    roko roko February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... difference between input and output voltage (x current) gets turned into ... ) The external brick supplies a voltage that's much more than ...
    RetroTechie RetroTechie February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... transformer) to reduce the mains voltage to 200V AC. This does ... reducing the input the DC voltage as explained in RetroTechie's ...
    bladerunner bladerunner February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... , in order to reduce the voltage drop that the hard-pressed ...
    RST#08 RST#08 February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... is to drop the input voltage to the mains transformer sure ... /> You can drop the output voltage from your PSU by adding ... diodes will give you a voltage drop of around 0.6V ...
    DEATH DEATH February 2009 Hardware
  • Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…

    ... , in order to reduce the voltage drop that the hard-pressed ...
    Winston Winston February 2009 Hardware
  • issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…

    ... the wrong type (too low voltage), or it is defective.
    roko roko March 2009 Hardware
  • Using a Spectrum in JapanHi all, at the moment I have a 48k Spectrum on its way (with a LOT of other stuff) to Japan where I intend to use it. So I have some fairly straight…

    ... a supply that keeps input voltage at at least 7V at ... need a bit higher average voltage, say 9V.

    Be ...
    RetroTechie RetroTechie March 2009 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 …

    ... killing the ULA if the voltage applied exceeds a certain level ...
    ingo ingo March 2009 Hardware
  • Using a Spectrum in JapanHi all, at the moment I have a 48k Spectrum on its way (with a LOT of other stuff) to Japan where I intend to use it. So I have some fairly straight…

    ... want to check both input voltage, and what the internal Spectrum ...
    RetroTechie RetroTechie March 2009 Hardware
<1…19202122232425…34>

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