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Search Again :: Adv Search 1000 results in 0.010s
<1…14151617181920…34>
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... that?s supposed to supply 12V to the modulator circuit.[/QUOTE ... which provides a stable +5V source. The +5V and +9V are then ... and coil arrangement to derive +12V and -5V.

    The ... circuit also provides a second +12V source ...
    Phu Phu December 2007 Hardware
  • Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…

    ... and coil arrangement to derive +12V and -5V.[/QUOTE]

    It ...
    Winston Winston December 2007 Hardware
  • 3.5'' Amstrad floppy on a +3 ?Hi guys, i bought a 3.5'' drive for an Amstrad 6128, from a guy here in Greece (he makes them) [url]http://img247.imageshack.us/img247/5594/amaffvrgs…

    ... they sell outside Greece. The 12V input is for use only ... per side) you only need 5V power supply.
    If you ... has pass through for the 5V) but for the +3 you ...
    gtsamour gtsamour February 2008 Hardware
  • DivIDE HelpHi all, After a rather long wait my DivIDE from Papaya labs arrived. I connected it to my spectrum, turned it on and...nothing. The green power LED…

    ... 12v wall wart, which runs the 12v side, and also feeds the 5v ...
    Winston Winston February 2008 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 …

    ... probably not providing the +12V and -5V supply lines to the lower ... 4116 state that applying 5V without 12V and -5V is a fantastic way ... your case) to generate -5V and +12V from the 9V supply input ... and the +5V regulated supply. ...
    Phu Phu February 2008 Hardware
  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector? Firstly, if they use +9v they won't work on a +3, since the +3 does…

    ... ]Do any peripherals use the +12v, -12v or 9v lines exposed at ... to use 9V line instead 5V line to not overload the ...
    Jose_Leandro Jose_Leandro March 2008 Hardware
  • Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…

    ... transistor is only for +12V and -5V and these lines are not ...
    ingo ingo April 2008 Hardware
  • Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…

    ... transistor is only for +12V and -5V and these lines are not ...
    gtsamour gtsamour April 2008 Hardware
  • Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …

    ... have enough voltage for the 5V reglator. I bought a 9V ... (without regulator) which supplies about 12V without load. At 2A there ... - so it has about 8.5V at minimum peak.

    ingo ingo May 2008 Hardware
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... of the from the regulated 5v supply.
    [/QUOTE]

    12v to 5v regulation from the SMPS ... by dropping 5v to 3.3v (instead of 9-12v to 3 ...
    Winston Winston May 2008 Hardware
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... 3.3v reg off the 5v supply increases the heat output ... will have an efficient 9-12v to 5v regulation from the SMPS ... by dropping 5v to 3.3v (instead of 9-12v to 3 ...
    csmith csmith May 2008 Hardware
  • connecting 3" flopy disk drive to PClooking at this image: [IMG]http://www.fileden.com/files/2006/9/12/214909/Amiga/3inchFDD_figure.png[/IMG] why are pins 2,4,6 and 14 coneccted to +5V…

    you didn't forget to swap +5V and +12V, right?
    otherwise it would kill most of electronics on 3" FDD.
    I once did that on Amiga A590, but luckily only two DRAM chips were fried.
    orange orange May 2008 Hardware
  • 48K specs boots, but THEN blinking blocks!Of all ZX problems I have seen, the 'blinking blocks' is the most common... Today I picked up a 48K, it boots and THEN it locks filling the screen wi…

    ... check the power circuit outputs (+5v, -5v and +12v).

    I had ...
    csmith csmith May 2008 Hardware
  • broken ZX 48K, help neededI have a broken down ZX 48K :cry: The keyboard membrane is almost completely destroyed, and this is what screen shows on power-on: [IMG]http://www.h…

    ... (4116). Make sure the +5v, -5v and +12v is present in the right ...
    Winston Winston June 2008 Hardware
  • 48k idle soundis there an emulator that emulates the genuine 48k idle hiss/noise (or whatever it's called)? I mean the sound heard when there is no sound, but buz…

    ... 4116 chips (for the -5v and +12v lines). I suspect the video ... sound change, since they consume +12v.
    Winston Winston June 2008 Emulators
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... ) but it has the +5V and +12V, enough to power a +2A ...
    zxbruno zxbruno June 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... a circuit diagram of the +12V and -5V power supplies, and page ... an extra 5V power supply.

    There is no -12V on ... is in fact an unregulated +12V supply from the collector of ...
    Jimmy Jimmy June 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... a circuit diagram of the +12V and -5V power supplies, and page ... 20 talks about an extra 5V power supply.[/QUOTE]
    Thanks ... an adjustable power supply upto 12V and 10A. So obviously it ...
    65C02 65C02 June 2008 Hardware
  • PSU queryHi all, just one quick question. Are Spectrum PSU's compatible with ZX81's? I've just bought an '81 off of Ebay, which was sold as "working, but the …

    ... by itself requires an internal 5V supply. It uses a standard ... supply and the 5V supply to make 12V and -5V, in a similar ... at about 8.5-10.5V (loaded).

    If you ...
    Phu Phu July 2008 Hardware
  • PSU queryHi all, just one quick question. Are Spectrum PSU's compatible with ZX81's? I've just bought an '81 off of Ebay, which was sold as "working, but the …

    ... supply and the 5V supply to make 12V and -5V, in a similar ... at about 8.5-10.5V (loaded).[/QUOTE]

    On ... directly connected to the 4116 +12V power pin, with no regulation ...
    Gods Gods July 2008 Hardware
  • Problem with Discovery OpusI've just got a Discovery Opus, but it seems to be faulty. When I connect the Speccy and switch it on, it displays the "C 1982 Sinclair Research", …

    ... connector is giving the correct 5V / 12V levels? (To confirm PSU is ...
    Jimmy Jimmy July 2008 Hardware
  • +3 compositve video out problemToday, I've tried to put a composite video out in my +3. I've built the circuit proposed [url=http://www.secarica.ro/html/plus3_hardware.html#composi…

    ... pin 6 in TEA2000).
    - +12v soldered to pin 14 in ... to GND marking in the missing tape connector.[/QUOTE]

    Don't connect the +12V from MC1488 but from TEA2000 ...
    Gods Gods August 2008 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    Check DC voltage at C911 (about 12V), check voltage at Pin3 of IC909 (5V).
    Try to add about 100?F to C911. Use an AC voltmeter and measure at C909. You should measure not more than some mV (
    ingo ingo September 2008 Hardware
  • Z80 ApplicationsI never realised how widely in use the humble Z80 processor was in early Arcade games (Galaga had 3 running in Parallel), Fax Machines, Photocopiers,…

    ... of its contemporaries required -5v and +12v rails), and integrated DRAM refresh ...
    Winston Winston September 2008 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    ... C911 (about 12V), check voltage at Pin3 of IC909 (5V).
    Try ... voltage at Pin3 of IC909 (5V)[/B] -> There is an ...
    odious odious September 2008 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... from the board. A single +5V power supply, and a good ... count on this board. The -5V wasn't used anymore, so ... generate it, could go. The +12V was still used, but only ...
    RetroTechie RetroTechie December 2008 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 …

    ... , and the input supply is 12V, you're still taking 1A ... on the 12V side. The power turned to ... 're drawing 1A at 5V, on the 12V input side, they tend ... 's LM2576 simple switcher (output 5V 3 amp) on a little ...
    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 …

    ... of the GND and 5V rails from the separate ... and the input supply is 12V, you're still taking 1A ... on the 12V side. The power turned ... re drawing 1A at 5V, on the 12V input side, they ... You can get 2 Amp 5V regulators and adjustable regulators, but ...
    BloodBaz BloodBaz 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…

    ... thought the Spectrum also generated -5V and +12V ( or something like that ...
    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…

    ... if the Speccy is using 5V internally, the regulator needs more ... to be able to supply 5V output.

    9V ... minimum input voltage for reliable 5V output.

    [QUOTE= ... thought the Spectrum also generated -5V and +12V ( or something like that ...
    DEATH DEATH February 2009 Hardware
<1…14151617181920…34>

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missing 10.6K 11.9K
12v 1.9K 3.2K
5v 3K 4.9K

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