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Search Again :: Adv Search 1000 results in 0.007s
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  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... 's not actually getting enough voltage at all (at least 1v ... my powered scart to hdmi converter but I'd rather not ...
    Ox. Ox. January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... 's not actually getting enough voltage at all (at least 1v ... my powered scart to hdmi converter but I'd rather not ...
    chinnyhill10 chinnyhill10 January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... peanuts) to provide the extra voltage (ignore the usb port and ... get the correct voltage anyway. That and split the circuit so that ... have one for the blanking voltage and one for the switching ...
    guesser guesser January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... get the correct voltage anyway. That and split the circuit so that ... have one for the blanking voltage and one for the switching ... voltage.[/QUOTE]

    Nice, Any ...
    Ox. Ox. January 2015 Hardware
  • Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…

    ... the 7805 by a switched voltage regulator can cause problems at ... the fact that the operating voltage of the PSU runs very ... current!), but the TR4/TR5 circuit stops oscillating for voltages higher ... . This will reduce the operating voltage by 0.7V to 12 ...
    HZJ HZJ January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... can produce the appropriate blanking voltage, but you are still ... current consumption. Since the voltage the TV sees is calculated ... (75 + R)
    [/CODE]the voltage increases as you decrease the ... though which only happen in circuit simulators, not real life ...
    guesser guesser January 2015 Hardware
  • Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…

    ... /> What capacitors relate to this circuit and where on the board ... get an equal or greater voltage rating for each replacement cap ... a low resistance reading - open circuit indicates a winding has failed ... - you're looking for open circuit (0L) reading here. A low ...
    balford balford January 2015 Hardware
  • Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…

    ... the transistors in this little circuit actually work - my understanding of ... a fairly complicated little circuit, combining a boost converter with an oscillator ... like a simple DC transistor circuit because as you can see ...
    guesser guesser January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... on the rest of the circuit, the capacitor will slightly " ... a regulated or smoothed DC voltage using just passive components = stuff ... you can increase the output voltage, at the expense of only ... These circuits are known as voltage doublers (plus there are a ...
    1024MAK 1024MAK January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... the inductor, it induces a voltage back into the inductor. So ... to DC. Depending on the circuit, it can be higher than ... switched into and out of circuit by transistors. When the capacitors ... the load at a higher voltage than the supply.

    1024MAK 1024MAK January 2015 Hardware
  • RGB video issue on +2 and +3. Signal high?I have a couple of +3's and a new +2a that arrived today. When I plugged in the +2a using my RGB lead from Retro Computer Shack I was reminded of a n…

    ... /Cockcroft?Walton multiplier. Unlike that circuit, however, the Dickson multiplier takes ... form of DC-to-DC converter."

    I'll give ...
    RobeeeJay RobeeeJay January 2015 Hardware
  • problems with a 48k[url]http://imgur.com/lpGfjik[/url] Hi WOS. Its my first post here. I have know about this site for a quite good time, but didnt had the will to con…

    ... sign, it normally means the voltage lines are correct, as when ... don't have an inverter circuit, so no coil) :-D
    1024MAK 1024MAK January 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... adjusting VR1/VR2 carefully! The voltage at LM1889 pin3-pin2 should ... 130mV. Sometimes also an antiresonant circuit (4.8MHz) integrated in the ...
    HZJ HZJ January 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... adjusting VR1/VR2 carefully! The voltage at LM1889 pin3-pin2 should ... 130mV. Sometimes also an antiresonant circuit (4.8MHz) integrated in the ...
    RSwipeCA RSwipeCA January 2015 Hardware
  • Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…

    ... resistance (limited voltage or limited current), the voltage/current the ... the characteristics of the circuit under test. Even more ... so when the circuit includes semiconductors.

    voltage insulation tester, not recommended ...
    1024MAK 1024MAK February 2015 Hardware
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... should have a DC restorer circuit included (as originally the composite ... removes this large standing DC voltage, but due to the high ... want a much better designed circuit. But it works for a ...
    1024MAK 1024MAK February 2015 Hardware
  • ZX Printer TroublesI've had a ZX printer sat about on the side for a while now and I eventually found the time and decided to try it out. I've hooked it up to a 48k Spe…

    I don't know much about these, but I thought that it uses a high voltage generator to produce the "spark". Maybe this circuit has failed...

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK February 2015 Hardware
  • ZX Printer TroublesI've had a ZX printer sat about on the side for a while now and I eventually found the time and decided to try it out. I've hooked it up to a 48k Spe…

    ... a high voltage generator to produce the "spark". Maybe this circuit has ...
    retrogamemart retrogamemart February 2015 Hardware
  • 48k issuesThe 48k speccy had several alterations ( issues) and I was wondering, they all seam to work ok so what was the point?<br>

    ... improving the DC-DC converter/inverter power circuit, allowing manufacture overseas and ...
    1024MAK 1024MAK June 2015 Hardware
  • Replacing foam pads on top of heatsink in Spectrum+Inside a Spectrum+ that I'm working on, the 2 foam pads on top of the heatsink (see photo for where they were) had become a disintegrated mushy pile …

    ... that when I swapped the voltage regulator, as I'm not ... need to get a duff circuit board from something and just ...
    Mousey Mousey July 2015 Hardware
  • Grey +2 - DOA and no power lightTook a punt on a grey +2 at the weekend to be a spare. It was "untested" although so were all my other +2's which are all fine. Tried to power th…

    ... PSU), killed the 78S05 voltage regulator. Sometimes a 78xxx ... the 78xxx type voltage regulator goes open circuit (broken inside the ... longer correctly control the output voltage, which will rise to ... just lower than the input voltage :-(
    Either of these ...
    1024MAK 1024MAK August 2015 Hardware
  • Spectrum CapacitorsLooking for some opinions here, if I may? In the 80's and 90's I used to repair Spectrums and other machines for a living so I'm reasonably famili…

    ... . Those in the DC-DC converter are probably the most stressed ... capacitors also sometimes go short circuit and that can damage the ...
    Zorn Zorn September 2015 Hardware
  • PSU replacement for +2a/+3Hi, With the suitable connector does a PC power supply can be used to power a ZX+2a/+3 ? Thanks

    ... lines simultaneously when a short circuit is detected on any of ... 0.5 mm2 ripcord ( typical voltage drop 40 mV / A m ...
    Dan Antohi Dan Antohi September 2015 Hardware
  • 48K colour issuesGentlemen, A friend handed me over a number of 48K machines to service, and among these there are four of them with various flavours of colour iss…

    ... seeing strange noise in the circuit, confirm that all the ground ... confirm that the internal inverter circuit is working by checking that ... quote]

    DC-DC converter is working properly as the ... also wonder if the small circuit around the chroma lead/ ...
    Opus Discovery Opus Discovery September 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... .
    But since the power circuit is behaving a bit differently ... quite up to testing the voltage lines so it has not ...
    harriusherbartio harriusherbartio October 2015 Hardware
  • 48k problemsHi all Just plugged in a 48k that I bought to find that the screen is jumbled with different colour pixel blocks. I removed the casing and noticed…

    ... duff regulator or a short circuit somewhere dragging down the voltage level.
    DEATH DEATH October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... electrolytic capacitor that is open circuit, or which has lost ... required. As the mains AC voltage passes through zero volts, ... the input voltage to the regulator chip will ... size electrolytic capacitors), test the voltage across each large or medium ...
    1024MAK 1024MAK October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... one of many "series type" voltage regulator chips which are available ... set the wanted output voltage from the voltage regulator.
    The middle ... 't know how the regulator circuit is wired up in a ... sheet to prevent a short circuit to the case (which should ...
    1024MAK 1024MAK October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... scale, it indicates an open circuit, or high resistance. If ... voltage regulator to the case/heatsink should be shown as open circuit ... for no electrical connection = open circuit.

    In the ... middle pin of the LM317 voltage regulator we are looking ...
    1024MAK 1024MAK October 2015 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    ... a short circuit. As effectively you are shorting the voltage regulator output ...
    1024MAK 1024MAK October 2015 Hardware
<1…18192021222324…34>

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