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  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... />
    If you include a capacitor in output signal, DC offset ...
    RetroTechie RetroTechie November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... and one last 16v 100uF capacitor left and thought I would ... .html[/URL] in that the Capacitor sits between the boards Video ... don't know what the capacitor would do, I know they ...
    hedge hedge November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... /> [I]Here[/I] the capacitor removes any DC component from ... hovers around 2.5V, capacitor will charge to that voltage ... and other side of the capacitor will hover around 0V. Which ... of receiving equipment.

    Capacitor value (in combination with 75 ...
    RetroTechie RetroTechie November 2010 Hardware
  • NEW TO SINCLAIR; HELP ON BUYING SPECTRUM 48khey, i have recently discovered the spectrum while surfing the internet and have quickly become obsessed in obtaining one. One problem : I am very kn…

    ... you include a 100uF/10V capacitor (+ to Spectrum insides, - to center ...
    RetroTechie RetroTechie December 2010 Sinclair Miscellaneous
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... ).

    There's a capacitor missing near the SED9420 and ...
    guesser guesser December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    It's a ceramic resonator. I think Pilsener is right, I seem to recall that the ZX81 uses a resonator instead of a quartz crystal for its CPU etc. timing.
    Winston Winston December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... be pretty unstable using a ceramic resonator instead of a crystal ...
    guesser guesser December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... why is it mentioned as "Ceramic filter" in the component list ...
    gtsamour gtsamour December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... why is it mentioned as "Ceramic filter" in the component list ...
    guesser guesser December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... filter often is crystal or ceramic. Both Z80 clock and videotimings ...
    roko roko December 2010 Hardware
  • Should this be connected?[IMG][URL=http://img528.imageshack.us/i/img7396m.jpg/][IMG]http://img528.imageshack.us/img528/6470/img7396m.th.jpg[/IMG][/URL] Uploaded with [URL=htt…

    ... 'm not sure if this capacitor is an original part, but ... the purpose of mounting a capacitor across a diode is to ...
    Pilsener Pilsener December 2010 Hardware
  • Should this be connected?[IMG][URL=http://img528.imageshack.us/i/img7396m.jpg/][IMG]http://img528.imageshack.us/img528/6470/img7396m.th.jpg[/IMG][/URL] Uploaded with [URL=htt…

    its in that pic, look to the right of that capacitor
    Macc Macc December 2010 Hardware
  • +2 Grey external tape modIve had a search through previous posts and besides mclouds mod for the +2a I couldnt find anything pertaining to the grey, only reason im posting is…

    ... I think possibly add a capacitor which is also omitted on ...
    guesser guesser December 2010 Hardware
  • +2 Grey external tape modIve had a search through previous posts and besides mclouds mod for the +2a I couldnt find anything pertaining to the grey, only reason im posting is…

    ... I think possibly add a capacitor which is also omitted on ...
    Alien 8 Alien 8 December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    I'm curious... would it work if instead of the original ceramic resonator of 6.5Mhz, I used a crystal of the same frequency?
    gtsamour gtsamour December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... if instead of the original ceramic resonator of 6.5Mhz, I ...
    guesser guesser December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... 6.5 MHz, 3-pin ceramic oscillators: if you run across ...
    RetroTechie RetroTechie December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... dead because of this crappy ceramic discriminator :(
    gtsamour gtsamour December 2010 Hardware
  • Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…

    ... regulator is not like a capacitor: it doesn't degrade with ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…

    ... regulator is not like a capacitor: it doesn't degrade with ...
    gtsamour gtsamour January 2011 Hardware
  • Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…

    ... main purpose of C124 variable capacitor and could it be changed ...
    netomc netomc January 2011 Hardware
  • zx81 rf outputHi All I'm not sure if this is an appropriate forum for the zx81, however I'll ask anyway;) I've connected my zx81 up to a mid 90's color tv. I can…

    ... /> My TV also preferred a capacitor in the signal (+ to transistor ... .

    Above transistor buffer (+ capacitor if used) fits comfortably inside ...
    RetroTechie RetroTechie January 2011 Hardware
  • zx81 rf outputHi All I'm not sure if this is an appropriate forum for the zx81, however I'll ask anyway;) I've connected my zx81 up to a mid 90's color tv. I can…

    ... /> My TV also preferred a capacitor in the signal (+ to transistor ... .

    Above transistor buffer (+ capacitor if used) fits comfortably inside ... this cirquitry with a 100uF capacitor to the video out. Excellent ...
    gtsamour gtsamour January 2011 Hardware
  • Can anyone identify this?[URL="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=330516214538&ssPageName=STRK:MEWAX:IT#ht_500wt_1156"]link[/URL] Those boards with the croc…

    ... linear slider - variable resistor or capacitor? Some sort of tuner?
    joefish joefish January 2011 Sinclair Miscellaneous
  • Issue2 troublesHi! I have a 48k Speccy Issue 2 which has trouble with displaying colour. It did have a broken LM1889 chip (it didn't display the blue component of …

    ... . Usually just a Xtal, some (ceramic) capacitors & resistors (apart from ...
    RetroTechie RetroTechie January 2011 Hardware
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... that actually have this C8 capacitor in that spot...

    gtsamour gtsamour January 2011 Hardware
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... that actually have this C8 capacitor in that spot...[/QUOTE]
    velesoft velesoft January 2011 Hardware
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... its just the C8 disc capacitor I have to remove to ...
    gtsamour gtsamour January 2011 Hardware
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... its just the C8 disc capacitor I have to remove to ...
    velesoft velesoft January 2011 Hardware
  • Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…

    ... safely try a known good capacitor in parallel with existing ones ...
    joefish joefish January 2011 Hardware
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