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<1…12131415161718…34>
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    Middle pin of the voltage regulator is ground.

    ...
    DEATH DEATH March 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... getting 5v off the 7805 voltage regulator.

    You can ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... are lucky then just the voltage regulator has fried (the black ...
    Womble Womble March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... 1v over the nominal supply voltage).

    Anyway, on checking ... getting 5v off the 7805 voltage regulator.

    You can ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... here - such as the input voltage will always be
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... obviously the parts of the voltage converter that generates those required ...
    DEATH DEATH March 2007 Hardware
  • External Speccy CommunicationHow does a speccy communicate with the outside world ?? Do you have to have the interface 1 for serial communications ( rs232 ) or are there other p…

    ... 10 meters. The difference in voltage between 1 and 0 is ...
    Grecu_hc85 Grecu_hc85 March 2007 Hardware
  • External Speccy CommunicationHow does a speccy communicate with the outside world ?? Do you have to have the interface 1 for serial communications ( rs232 ) or are there other p…

    ... /-4v - I think the 'ambiguous' voltage range is between 3.5 ...
    Winston Winston March 2007 Hardware
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... would fall over as the voltage sagged just enough to cause ...
    Winston Winston March 2007 Hardware
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... to 11.73V onload.
    Voltage into 7805 11.73, with ...
    DEATH DEATH March 2007 Hardware
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... would fall over as the voltage sagged just enough to cause ... either speed or input/output voltage swing or fanin/fanout issues ...
    Marcelo Marcelo March 2007 Hardware
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... with an EPROM? There's voltage and pin probs no doubt...
    dekh dekh March 2007 Development
  • +3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …

    ... it safe to take this voltage from "EXPANSION I/O socket ...
    piters piters March 2007 Hardware
  • Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…

    ... (well, apart from the 7805 voltage regulator) that gets measurably above ...
    Winston Winston March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... load (that is to say, voltage is 5V only when power ... about 33% above their rated voltage when no current is being ...
    DEATH DEATH March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... . The meter should read a voltage. If that number is greater ...
    DEATH DEATH March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    Not well regulated, at least! Most 5v stuff has an absolute maximum rating of 5.25 volts. Unfortunately, 5.4v isn't quite enough to be regulated spot-on by an inexpensive 7805 (which requires a minimum input voltage of 7v)
    Winston Winston March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... , and it'll drop the voltage by about half a volt ... . If the voltage dips too low during use ...
    DEATH DEATH March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... this is the drop out voltage at which it'll work ... advised you to use a voltage dropping diode, see what he ...
    DEATH DEATH March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... how useful the forward voltage drop of a diode ... worrying that the forward voltage drop will be too ... the 7805 says the minimum voltage (including the very bottom ... pack, because if the voltage of the power pack ... if the power pack voltage is nowhere near what ...
    Winston Winston March 2007 Hardware
  • Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …

    ... several thousand volts -- this high voltage creates a strong electrical field ... at a much, much higher voltage than either end of the ... of the sense of the voltage on the spark plug's ... circuit so that no hgh voltage can form. This is probably ...
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Chit chat
  • Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …

    ... timed such that the high voltage goes out at the right ... sends out impulses of high voltage to create the spark at ...
    Winston Winston March 2007 Chit chat
  • Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …

    ... circuit so that no hgh voltage can form. This is probably ...
    FrankT FrankT March 2007 Chit chat
  • Mysteries of Electricity QuizA little fun quiz that I know the answers to, but may lead to some head scratching and disbelief, but there's easy experiments than can be performed …

    ... will be determined by the voltage at each end of the ...
    Winston Winston March 2007 Chit chat
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... is supplied by the 7805 voltage regulator, the rest by a ...
    Winston Winston March 2007 Hardware
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... is supplied by the 7805 voltage regulator, the rest by a ...
    odious odious March 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    Done some voltage checking tonight and I reckon ...
    owdeuk owdeuk April 2007 Hardware
  • Anyone still use their Spectrum?I mean, with the quality of emulation available, does anyone still hook up the spectrum and load from tapes? I still have my Spectrum + and it's in p…

    ... a local electronics store, variable voltage and 2amp output, works great ...
    beanz beanz April 2007 Emulators
  • Is this power supply ok?[url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160104076665&fromMakeTrack=true[/url] I've bought a few items from this eBay seller and ne…

    ... a local electronics store, variable voltage (3v to 12v), puts out ... it extensively...as its variable voltage I can use it for ... background here with the variable voltage dial on it....pretty much ...
    beanz beanz April 2007 Hardware
  • External power supply for SpectrumsWrong title. What I meant was 'Battery pack to use Speccy on the go'. I visited batterygeek.net, explained what I wanted to do with my spectrum, and…

    ... current, as long as the voltage is correct.

    Just ...
    Pilsener Pilsener April 2007 Hardware
<1…12131415161718…34>

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