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  • plus3e simple ide interface problemhi, I prepared a 8bit simple ide interface 3 days ago, but I got problems (with or without ide cable connected). 1.First of all, I have to press re…

    ... the +3's supply, Extra decoupling, particularly on the CPU is ... /> You should also also add decoupling to the LS10 on your ...
    spodula spodula February 2009 Hardware
  • causes of spectrum buzzing when starting?Hello Do you know if might be a problem that a buzzing sounds sometimes when a spectrum is starting on? thanks

    ... supply that generates -5v, +12v and -12v). There's nothing you can ...
    Winston Winston February 2009 Sinclair Miscellaneous
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…

    ... any IC - it needs a decoupling capacitor as close to the ... harder it is for the decoupling capacitor to do the job ...
    Winston Winston February 2009 Hardware
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…

    ... ) board. In that case, place decoupling capacitors on that separate board ...
    RetroTechie RetroTechie 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…

    ... will simplify the need for -12v and +12v rails (and hence simplify ...
    BloodBaz BloodBaz 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…

    ... ;336997]The tranformer that supplies 12V to my monitor has started ...
    mile mile February 2009 Chit chat
  • 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…

    ... ;336997]The tranformer that supplies 12V to my monitor has started ...
    Scottie_uk Scottie_uk February 2009 Chit chat
  • 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…

    ... ;336997]The tranformer that supplies 12V to my monitor has started ...
    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…

    ... the components! Must be the 12v.
    I would say you ...
    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…

    5v, 12v there's only 7v difference :)

    When components are removed or replaced is there any supporting circuitry that can then also go?
    dekh dekh 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 LM1889 uses 12V (minimal 9). Also the Spectrum ...
    roko roko 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…

    ... ;336997]The tranformer that supplies 12V to my monitor has started ...
    mel the bell mel the bell February 2009 Chit chat
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    ... ...heheheh :lol: of cutting the 12v lines to the ram chips ...
    PauloAlb PauloAlb March 2009 Hardware
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    Well, i isolated the 12v line for every chip, by ...
    PauloAlb PauloAlb March 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…

    ... `ve got +5,-5 and 12v at the 4116 ic`s ...
    adekav adekav 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 …

    ... stability. I myself use a 12V reed relais which works fine ...
    ingo ingo March 2009 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... would temporarely solder a few decoupling capacitors (10 - 100uF) on several ...
    roko roko March 2009 Hardware
  • Advice on cooling a PC needed.I am about to build what is gonna be my final PC but i want it to be a humdinger and need advice on keeping it cool as in the past i have built prett…

    ... 26cm long and requires 2 12v power connectors). My PC is ...
    The Starglider The Starglider March 2009 Chit chat
  • 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…

    ... is a variable PSU (3v-12v that has a 2amp output ... -LINEAR-DC-POWER-SUPPLY-3-12V-2a_W0QQitemZ350184037220QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item350184037220&_trksid ...
    beanz beanz April 2009 Hardware
  • Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…

    ... -5V came back, but the 12V are actually 11.10V... :-?
    That's good enough as 12V supply :)

    [QUOTE]
    RetroTechie RetroTechie April 2009 Hardware
  • Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…

    ... with that voltage in the 12V line.

    After finding ...
    Hernán Pablo Álvarez Hernán Pablo Álvarez April 2009 Hardware
  • Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…

    ... bad solder joints on the +12v circuit, and excessive current ... consumption on the 12v line. Excessive current consumption ... will cause the +12v to sag. The proper ... current consumption on the 12v line is an exercise ...
    Winston Winston April 2009 Hardware
  • Games not working on Timex 2048Timex 2048 is a very good Spectrum 48k clone, over 90% of games work fine. But there are also not working games or working but not properly. Is there…

    ... that machine copies the resistor decoupling done on the Spectrum. That ...
    Alcoholics Anonymous Alcoholics Anonymous April 2009 Games
  • Games not working on Timex 2048Timex 2048 is a very good Spectrum 48k clone, over 90% of games work fine. But there are also not working games or working but not properly. Is there…

    ... that machine copies the resistor decoupling done on the Spectrum. That ...
    Fred Fred April 2009 Games
  • speccy 128 toastrack joysticksDoes the RS232 port (or the keypad port) work as a joystick port on the toast rack, and if so what 'system' is it...interface 2 or kempston? Secondl…

    ... , meaning they give +/-12V out, and expect +/-12V in. Then they're ...
    Phu Phu April 2009 Hardware
  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... outputs, where there is insufficient decoupling or lack of a ground ...
    Winston Winston May 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…

    ... adapter provides the +5V and +12V that the above models need ... . The -12V isn't really necessary, because ...
    zxbruno zxbruno May 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…

    ... they use +5V @ 2A, +12V @ 700mA, and -12V @ 50mA.

    So ...
    MagicKnight MagicKnight May 2009 Hardware
  • Compact Flash adapterIm think about getting "making if I have too" a cf adapter what does everyone else use ? any info would be great... so far I found a diy "simple" i…

    I built Pera Putniks Simple CF interface, It's just a CF connector, a logic IC and an edge connector!!!! oh, and a decoupling capacitor. I use that in a +3e and it works a dream!!!
    nuggetreggae nuggetreggae May 2009 Hardware
  • PSU for + AND +2 for saleHi all. as I live in Canada now, I cannot use either of my UK(240 Volt) power supplies. I'm over in the UK right now, so can post these 2 out to …

    ... on the end giving +5V, +12V and -12V supplies).
    trellis trellis May 2009 Sales
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott 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
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
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    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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