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Search Again :: Adv Search 1000 results in 0.004s
<1…17181920212223…34>
  • Prism VTX 5000 ModemI just got one of these but how do you use it? I dont have a manual and a review i read of it says you turn on the spectrum and the software automati…

    ... power up as does the 7805 regulator.
    ZX-MAD ZX-MAD May 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…

    ... 9V; 2,3A its voltage goes down to 2, ... powerfull power supply, with voltage and current indicators. Current ... smoke went out of the 7805. I replaced it, then ... After replacement power supply voltage still drops to 2,5V ... I said power supply voltage drops to 2,5V.< ...
    65C02 65C02 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…

    ... supply 9V; 2,3A its voltage goes down to 2,5V ... magic smoke out of another 7805. There's something else broken ...
    Winston Winston 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…

    ... supply.[/QUOTE]
    When 7805 went dead, I was ... smoke out of another 7805. There's something else ... gets warm, even the 7805 stays quite cold (I ... the terminals of C34. Voltage still sagging to 2,3 ... EARTH[/B][/COLOR] of the 7805 (middle terminal). The outside ...
    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 …

    ... supply. It uses a standard 7805 regulator for this which requires a ...
    Phu Phu July 2008 Hardware
  • +2 grey PSU capacitor changeHi I opened up a +2 grey power supply (2.1A max output) unit in order to replace the aged electrolytic capacitor inside, just like I always do with …

    ... cap is used) and the 7805 can handle up to a ... PSUs that have the same voltage).

    The thing is ... for use on the same voltage demanding machines, prove that 4700uF ...
    gtsamour gtsamour November 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?

    ... . So I re-routed this voltage directly from the unregulated input ... , and voila: the whole (problematic) voltage conversion circuitry (various transistors, resistors ... lower)
    * Replace +5 regulator with switching regulator
    * Document this stuff ...
    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 …

    ... say that heat from the regulator's heatsink is causing the ... warm anyway.

    A 7805 regulator shuts down when it gets ... /datasheets_pdf/7/8/0/5/7805.shtml[/url] ) the output ... the output current from a 7805 regulator using a TIP3055 power transistor ...
    DEATH DEATH 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 …

    ... just a matter of the 7805 regulator then all he has to ...
    gtsamour gtsamour 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 …

    ... that (although a 90% efficient regulator sounds great!)[/QUOTE]

    7805, but I would have to ... anything more than desoldering the 7805 and soldering a 3 pin ...
    Winston Winston January 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…

    ... rails (and hence simplify the regulator area?)

    What are ... ? the Z80? or for controlling voltage on start up?)
    BloodBaz BloodBaz 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…

    ...
    a) The internal +5V regulator is a simple, robust, but ... a voltage that's much more than needed by the regulator. And ... .
    2) Replace internal regulator with a low-drop version ... and thus bypass the internal regulator entirely. Has anyone tried that ...
    RetroTechie RetroTechie 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…

    You might try exchanging the 7805 regulator, just to close that door.< ...
    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…

    ... check both input voltage, and what the internal Spectrum regulator gives for ... drawn (that's what a regulator does). But for a 48K ...
    RetroTechie RetroTechie March 2009 Hardware
  • 128K +2 (Grey) no image output.Got an 128K +2 Grey that works in every aspect except no image (neither from RF or RGB), swaped the RF from my 48K+ witch was working well and tested…

    ... +12 fault could be the 7805 regulator failing (on that big *oversized ...
    Zetr0 Zetr0 April 2009 Hardware
  • issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…

    ... power transistor (larger than the 7805 regulator) in the place of the ...
    Winston Winston June 2009 Hardware
  • 48k + Power supplyHi, Anyone know where I can get a replacement PSU for the 48k Plus? Nothing on Ebay at the minute. Looks like the end is Imminent for my one! Tha…

    ... get converted by a lovely 7805 to 5 volts at 3 ... onto the +5 (where the regulator would of been.) surely this ...
    Zetr0 Zetr0 July 2009 Hardware
  • ZX Spectrum not working - Please help.Hi there, I am new to this forum and was pointed in this direction by a fellow Youtuber after uploading the following video and then explaining that…

    ... , suspect a failure in the regulator 7805 or some other section of ...
    mcleod_ideafix mcleod_ideafix August 2009 Hardware
  • Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…

    ... you're lucky, just the 7805 regulator. It's cheap and easy ... 7805, then we can go from there. You can get this regulator ...
    Winston Winston September 2009 Hardware
  • Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…

    ... you're lucky, just the 7805 regulator. It's cheap and easy ... 7805, then we can go from there. You can get this regulator ...
    Scottie_uk Scottie_uk September 2009 Hardware
  • Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…

    ... you're lucky, just the 7805 regulator. It's cheap and easy ... 7805, then we can go from there. You can get this regulator ... maplins and they had one 7805 regulator left. It only had two ...
    Scottie_uk Scottie_uk September 2009 Hardware
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... (to be checked at the 7805 regulator). And the Spectrum internally generates ...
    RetroTechie RetroTechie September 2009 Hardware
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... (to be checked at the 7805 regulator). And the Spectrum internally generates ...
    cycyc cycyc September 2009 Hardware
  • 48k spectrum restarts by itselfFirst of all hello from a newb and thank you for your help. This site has already offered me a lot of insight. I have a 48k spectrum that will boot …

    ... -30 mins
    - Removed the - 7805 regulator (I think) - 3 pin component ...
    hedge hedge January 2010 Hardware
  • Spectrum 48k run timesHow long should you expect to have your 48k turned on for? I know they get really hot so whats the max amount of time you can leave it on for? Thank…

    ... are the ULA and the 7805 regulator. The Z80 shouldn't really ... transferred to it from the 7805's heatsink that goes right ...
    Winston Winston January 2010 Hardware
  • Spectrum 48k run timesHow long should you expect to have your 48k turned on for? I know they get really hot so whats the max amount of time you can leave it on for? Thank…

    ... are the ULA and the 7805 regulator. The Z80 shouldn't really ... transferred to it from the 7805's heatsink that goes right ...
    guesser guesser January 2010 Hardware
  • Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…

    ... TO220 package ( The same as 7805 regulator) and it has different pins ...
    Jose_Leandro Jose_Leandro March 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... replace the TR3, TR4 and 7805 transistor (the big one that ... .
    I have done some voltage check on IC6:
    Pin ... on mainboard are hot beside 7805.
    Tommorow i will try ... and replace TR3, TR4 and 7805.
    Should i do anything ...
    gottrek gottrek April 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... chip or capacitor. (After exchanging 7805 of course)[/QUOTE]
    Are ... -attach the heatsink - possibly the 7805 can't get rid of ... [/I] diodes! Also see the voltage rating on it - diodes don ...
    RetroTechie RetroTechie April 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... stable image, and the supply voltage for +12V indicated above, is ... 't hurt to replace the 7805, but first try giving it ... ! Btw. what does the 7805 get as input voltage? (and with "get ...
    RetroTechie RetroTechie April 2010 Hardware
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