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Search Again :: Adv Search 1000 results in 0.004s
<1…16171819202122…34>
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... certainly won't be. the 7805 will tend to be "iffy ... 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?

    ... usually worrying that the forward voltage drop will be too ... /> The datasheet for the 7805 says the minimum voltage (including the very ... 7805 rather than trust a power pack, because if the voltage ... memory, the 7805 is good for an input voltage up to something ...
    Winston Winston March 2007 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    ... be able to supply a 7805. In that case, you'll ... serious.

    Running the regulator without a heatsink is not ...
    Pilsener Pilsener April 2007 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    The regulator has overheating/short circuit protection ... * the +5v rail if the regulator shuts down. It might not ... is not fed by the 7805). So keep it *short*. The ... is sufficient to warm the regulator up fairly quickly.

    Winston Winston April 2007 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... that runs entirely off the 7805 regulator. All the other digital parts ... single 5v supply off the 7805 too. (I've not looked ...
    Winston Winston May 2007 Hardware
  • l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …

    ... takes its load off the regulator. You should raise the resistor ... +5V, this prove than the voltage is present. Also, this is ... some more mA load on regulator this change some thing.
    Gods Gods May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... enough to blow up the 7805 and blow up the coil ... or 0 (or maybe the voltage changes by something less than ...
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... enough to blow up the 7805 and blow up the coil ... or 0 (or maybe the voltage changes by something less than ...
    Avian Avian May 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... your PSU really produces stabilized voltage. This can be done by ... (usually an IC similar to 7805 but producing 9V).
    If ...
    Sonic Sonic July 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... ]

    The fact that 7805 doesn't have a shortage ... the machine and measure voltage produced by 7805. It should be 5V ... measure voltages before and after 7805. It's likely that at ...
    Sonic Sonic July 2007 Hardware
  • +3 Sound Mod.Hi All, I am very much a novice when it comes to building electronics, but I thought I'd have a go at [url]http://www.geocities.com/sinclair_bitz/st…

    ... also see i've removed regulator voltage chip.
    Edit: Also R15 ...
    Gods Gods July 2007 Hardware
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... (1N4007) from a 7805 regulator ground pin down to ... code] +-----+
    | O |
    +-----+
    | 7805|
    | |
    +-----+
    | | |
    ... cap at the regulator's output pin to ...
    Marcelo Marcelo July 2007 Chit chat
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... sides of the regulator, not just the ... code] +-----+
    | O |
    +-----+
    | 7805|
    | |
    +-----+
    | | |


    The regulator only has one output - your ...
    DEATH DEATH July 2007 Chit chat
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... :) I was thinking that that regulator outputted 12v and 5.7v ... question time, then: what is 7805 actually regulating? both of those ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    The regulator takes in a voltage (between IIRC 7v and 18v) ... .8v depending on the forward voltage drop of the diode).
    voltage across the capacitor increases with ...
    Winston Winston July 2007 Chit chat
  • ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…

    ... a higher load capacity, the voltage will be two or three ... , and the small switch mode regulator in the expansion may not ... /> You could get a 7809 regulator - it MAY work with a ...
    DEATH DEATH August 2007 Hardware
  • ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…

    ... " and use 7.5V output voltage.
    - it's unexpensive
    - Minimal 7805 heat dissipation !
    Gods Gods August 2007 Hardware
  • PC Power supply for SpeccyHi all, after 13 years with out playing spectrum games I am eager to play the old games. Thus I got up to the garret checking my old stuff. Two of m…

    ... peripherials (which utilize regulators like 7805 to make own power out ... and do not use this voltage directly).
    Sonic Sonic August 2007 Hardware
  • I've got a divIDE. Now what?I've purchased a divIDE and after a month it's at home. What can I do now with that? I've got a 48k+, a +2B and a +3. The +2B has the original ROMs,…

    ... starts, you get a big voltage drop on the power rail ... interface has it's own 7805 reg yes, but the drives ...
    DEATH DEATH September 2007 Hardware
  • Broken 128+2 :(Just got my eBay Speccy through the other day, plugged it in and everything but the red light on the keyboard doesn't come on and there's no connecti…

    ... supply. If good check the 7805 regulator IC and this +5V output ...
    Gods Gods October 2007 Hardware
  • Broken 128+2 :(Just got my eBay Speccy through the other day, plugged it in and everything but the red light on the keyboard doesn't come on and there's no connecti…

    ... doesn't cure it, the regulator 7805 which is mounted on the ...
    DEATH DEATH October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    ... a bad power regulator (most ICs got to high voltage).

    ingo ingo October 2007 Hardware
  • ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…

    ... a bad power regulator (most ICs got to high voltage).[/QUOTE]
    Gods Gods October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    One thing you might want to do, then, is get hold of some breadboard - and a collection of 74-series logic, and a 7805 regulator (so you can get 5 volts), a bag of 50 or so 5 volt LEDs and experiment for a bit. You'll find it very instructive.
    Winston Winston October 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…

    ... be a problem with the 7805 regulator that´s supposed to supply ...
    Johan Johan 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…

    ... be a problem with the 7805 regulator that?s supposed to supply ... . It is pushed through the 7805 regulator which provides a stable +5V ...
    Phu Phu December 2007 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…

    ... side via a 7805 regulator (the usual 7805 circuit, the regulator plus 2 capacitors ...
    Winston Winston February 2008 Hardware
  • I killed my SpectrumMy room was a mass of leads.... and I plugged my NES transformer into my ZX Spectrum +2 accidently, frying it :cry: , am I screwed? or is there somet…

    If you're lucky, you only fried the 7805 regulator which is very cheap and common.
    gtsamour gtsamour March 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 …

    ... 1.5A to have enough voltage for the 5V reglator. I ... 9V/3A power supply (without regulator) which supplies about 12V without ... leads to a minimum peak voltage of 6.8V (can only ...
    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…

    ... may actually be the right voltage range and polarity to take ... there was no regulator at all and measuring
    voltage during charging ...
    Cookie Cookie May 2008 Hardware
<1…16171819202122…34>

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