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Search Again :: Adv Search 1000 results in 0.007s
<1…17181920212223…34>
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... read, I understood that the voltage was regulated from 9v to ... the internal switching power supply circuit, which draws its power from ... that this part of the circuit has a connection to the ... to use as a reference voltage.

    It is possible ...
    1024MAK 1024MAK August 2014 Hardware
  • Help put this back to 16kSo this issue 2 arrived today and ive opened it up just to nosey and confirm that infact it is an issue 2. Now from the help offered in an earlier po…

    ... resistance range. Make sure the circuit is switched off and capacitors ... . I believe it can measure voltage and current without a battery ...
    Zorn Zorn August 2014 Hardware
  • ZX81 Composite mod on the cheap?Hi i'm looking for a good and cheap way to do a composite mod on a broken ZX81 that I have. I know there is a ZXvid on sellmyretro, but the price is …

    Looking at that circuit above, for the 2C210E ULA ... the ZX81 composite video circuit yet. The voltage swing available on the ... any collector resistance for short circuit protection.
    rga24 rga24 August 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... was some sort of power circuit and we could make mesaurements ... , but apart from the 7805 voltage regulator (that provides the +5V ...
    1024MAK 1024MAK August 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    If you've got the issue 3B circuit, you should probably check the voltage at each side of R79 instead (assuming the circuit diagram is correct).
    Zorn Zorn August 2014 Hardware
  • ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …

    ... the issue 3B circuit, you should probably check the voltage at each ... side of R79 instead (assuming the circuit diagram ... ...

    Or maybe the circuit diagram is not correct...
    Renegade Renegade August 2014 Hardware
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... video circuit is much more simple - there's an inverting voltage amplifier ... afterwards. Either way, the 48K circuit would get much more complicated ...
    rga24 rga24 August 2014 Hardware
  • ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…

    ... an update - I measured the voltage using the old PSU and ... I tried the Spectrun PSU/Converter on the other boards using ...
    rune rune August 2014 Sinclair Miscellaneous
  • 1st interface in 30 yearsHi all, The last time I built a ZX Spectrum interface was 30 years ago, so today I gave it a whirl with an external rom. Switchable in/out of course…

    ... have to worry about the voltage drop across a LED if ... 's before it in the circuit.

    The Zeners or ... will have their own breakdown voltage that'll have to be ...
    balford balford August 2014 Hardware
  • 1st interface in 30 yearsHi all, The last time I built a ZX Spectrum interface was 30 years ago, so today I gave it a whirl with an external rom. Switchable in/out of course…

    ... to worry about the voltage drop across a LED ... 's before it in the circuit.
    [/QUOTE]

    ... starts to glow when the voltage across it is between ... to have a reverse voltage of Vcc minus what ... dim depending on whether the voltage is too high or ...
    guesser guesser August 2014 Hardware
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... the actual circuit used.

    So test the voltage across the ...
    1024MAK 1024MAK August 2014 Hardware
  • 1st interface in 30 years (update)Hi all, Just a wee update to my "1st ZX interface in 30 years" project. Main IC's: 82C55 three 8-bit port I/O (configured for 12 dig in, 12 dig out…

    ... inputs. I used a homemade voltage source for this.

    converter IC?.....well I've used ... be due to the I2C converter. I have tried moving the ...
    IanJ IanJ August 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... the Sinclair designed switch mode circuit (TR4, TR5 and the coil ... a second DC to DC converter to supply +12V for the ... =gensearch&Ntt=DC+DC+converter&Ntx=mode+matchallpartial& ...
    1024MAK 1024MAK September 2014 Hardware
  • Hot plugable edge connector?Could the spectrum's edge connector have been made hot plugable without adding much to the manifacturing costs? I was thinking along the lines of a…

    ... of the above
    - Power circuit stops oscillating, blowing TR4
    voltage allowing you to remove the ...
    Basher Basher September 2014 Hardware
  • 'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…

    ... inverter / switch mode power supply circuit (TR4, TR5 and the ... take your time doing the voltage readings.

    The ... is produced by the 7805 voltage regulator, which should work regardless ... or well outside the required voltage range. The +12V supply ...
    1024MAK 1024MAK September 2014 Hardware
  • Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …

    ... and without any feedback circuit between the primary and ... Also wouldn't over voltage and over current protections ... /> Over voltage yes, but not over current. Short circuit protection will ... be an added benefit. Over current and voltage ...
    Pierre Pierre October 2014 Hardware
  • Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …

    ... machines, these all have internal voltage regulator circuitry. They are ... regulated supply with an output voltage of 8V to 11V. ... (over current/overload/short circuit protection) is part of ... and comes as standard. Over-voltage (also called crowbar protection) ...
    1024MAK 1024MAK October 2014 Hardware
  • How important is the 9V line?I'm in the middle of resurrecting an Opus Discovery. The transformer is gone so Im using a small switched mode PSU from a PC. My plan is to bypass …

    ... , does anyone have a good circuit diagram for the Opus Discovery ... .9V (on load voltage) and the internal power circuit will be fine ... the +9V input with a voltage between +8V and +10V.
    circuit upgrade, the Spectrum will work okay from a higher input voltage ...
    1024MAK 1024MAK October 2014 Hardware
  • Dodgey R62 / D16 on Issue 2?Hello all, I am still beavering away trying to work out why my Issue 2 fails and after a much closer visual inspection I noticed what looks like som…

    ... bible, the Sinclair service manual, circuit diagrams etc) from WoS
    voltage to expect, quite another to ...
    DEATH DEATH October 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... to a part of the circuit that is 0V (also known ... /p/ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31[/URL ... /p/ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31j"]http ... /p/ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31j[/URL ...
    1024MAK 1024MAK October 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... indication, it depends on the circuit. For the Spectrum, it is ... the important electrolytic capacitors in circuit.

    However, if you ... 'scope, you can investigate the voltage signals and this [I][B ...
    1024MAK 1024MAK October 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... a collection of laid out circuit elements so you don't ... that can carry a larger voltage to program the EEPROM cells ...
    Alcoholics Anonymous Alcoholics Anonymous November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... model it with lumped circuit elements. This is something ... quantities well enough if your circuit model is good enough. ...
    Even a simple lumped circuit model consisting of a resistor ... making the circuit which induces a back voltage into the circuit. This ...
    Alcoholics Anonymous Alcoholics Anonymous November 2014 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... a problem with the voltage inverter formed by TR4, ... either fall to the same voltage as the +9V unregulated ... voltage close to 0V depending on which version of the inverter circuit ... lines.

    Supply voltage testing on decoupling electrolytic capacitors ...
    1024MAK 1024MAK November 2014 Hardware
  • "real good" keyboard membranes for Spectrum+Hi, is there a possibility that someone will produce a real good substitue for defective membranes of Spectrum+ or 128k heatasink. I bought several …

    ... produce quite as much voltage around the membrane circuit as in the ...
    rwap rwap November 2014 Hardware
  • 128k Toastrack Composite Video output confusion!Hi everyone. Ok, so I have a couple of 48k's that I have performed Wombles fantastic composite mod on. They work great here in Canada on my big scre…

    ... for lowering the TTL signals voltage to a SCART acceptable level ... monitor you need a signal converter, but I've read the ...
    geosiou geosiou November 2014 Hardware
  • AVR ZX Spectrum V2_0Good time! Glad to present my new development - AVR ZX Spectrum V2_0. Sorry, have no english version of this video. [url]http://www.youtube.com/watch…

    ... /> I understand this is a circuit board that emulates standard Spectrum ... (Mini-DIN) keyboard, and RGB converter. Correct?

    How accurate ...
    Einar Saukas Einar Saukas December 2014 Hardware
  • 128k Toastrack Composite Video output confusion!Hi everyone. Ok, so I have a couple of 48k's that I have performed Wombles fantastic composite mod on. They work great here in Canada on my big scre…

    ... www.amazon.com/Generic-Scart-Converter-1080P-Video/dp/B00DI6HTOI/ref ... www.amazon.com/Generic-Scart-Converter-1080P-Video/dp/B00DI6HTOI/ref ... connect the Spectrum to the converter:
    [URL="http://www. ... fitting the same resistor/cap circuit will fix this on my ...
    RSwipeCA RSwipeCA December 2014 Hardware
  • 128k Toastrack Composite Video output confusion!Hi everyone. Ok, so I have a couple of 48k's that I have performed Wombles fantastic composite mod on. They work great here in Canada on my big scre…

    ... the Spectrum as for the converter!!! The converter should have its own ... the power supplies with Canadian Voltage ones over the next few ... the two pin plug! The converter is connected via a different ...
    RSwipeCA RSwipeCA December 2014 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…

    ... with my SCART to HDMI converter.

    Can you solder ... SCART to HDMI converter somewhere that needs a voltage but I've ...
    chinnyhill10 chinnyhill10 January 2015 Hardware
<1…17181920212223…34>

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