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<1…23242526272829…34>
  • Composite video for 48k Capacitor orientationHello, My multisystem TV is acting up and I'm unable to navigate the menu to tune in the RF signal for my speccys. However the A/V input still works.…

    ... input there is a clamping diode, limiting the video signal to ...
    ingo ingo April 2013 Hardware
  • Composite video for 48k Capacitor orientationHello, My multisystem TV is acting up and I'm unable to navigate the menu to tune in the RF signal for my speccys. However the A/V input still works.…

    ... input there is a clamping diode, limiting the video signal to ... be decoupled so that the diode lifts the signal up to ...
    guesser guesser April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... with your multimeter in the diode test mode. Put the test ...
    Zorn Zorn April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... resistance rather than to the diode test mode. If so and ... be best to use the diode test mode to measure the ... TR5 in circuit with the diode test mode again (as I ...
    Zorn Zorn April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... checked, and i used the diode check on them.

    deadeye deadeye April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... ;697119].... and i used the diode check on them.[/QUOTE]
    Are you sure? The diode test mode shows the forward ...
    Zorn Zorn April 2013 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... .jpg[/IMG]

    5. Diode D8 ( 1N4148 ) is soldered onto ... .co.za/Construction/transistor and diode.JPG[/IMG]

    6 ...
    Pierre Pierre May 2013 Hardware
  • CapacitorsSorry, another question... I've done a bit of looking around, although after a couple of beers this may not have been as systematic as usual, but I …

    ... of capacitors used in a diode bridge rectifier circuit will depend ... on the + and ? of the diode bridge rectifier. The red waveform ... the capacitor used in a diode bridge rectifier circuit.

    Pierre Pierre May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... the cathode of the D20 diode...

    now the machine ...
    emilen72 emilen72 May 2013 Hardware
  • Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…

    ... technology of standard transformer, a diode bridge and smoothing capacitor is ...
    Pierre Pierre May 2013 Hardware
  • Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…

    ... you have a DMM with diode test? If so, remove TR4 ...
    Falco-F8L Falco-F8L May 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... basic multimeter, with volts, resistance, diode and transistor testing. I'm ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... the basis of TR3 a diode (plus an R for 'discharge ...
    roko roko June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    How about use 1 diode, Anode connect to reset pin of Z80 and cathode connect to microcontroller.
    superfo superfo June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... 0.

    @Superfo: a diode with the cathode to the ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    @Superfo: a diode with the cathode to the ... microcontroller pin always HI so diode will alway off, no current ...
    superfo superfo June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    [QUOTE=superfo;705733]@Superfo: a diode with the cathode to the ... microcontroller pin always HI so diode will alway off, no current ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... necessary, one can put a diode. Anode must be connected to ...
    TK90XFan TK90XFan June 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... necessary, one can put a diode. Anode must be connected to ... output about 3V, so the diode will always be direct polarized.
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • DiHalt 2013Hello everyone! from 6 to 7 July in Nizhny Novgorod (Russia) will be held openair demoparty "Dihalt 2013."The program includes the following competit…

    ... ]
    4. 6.54 the harlequin / hydrogen
    5. 5.77 ...
    osa osa July 2013 Announcements
  • Why is the B Disk interface selling for so much on ebay?I often watch unusual interfaces that pop up on ebay, and I noticed that this B Disk interface just went for ?113: [url]http://www.worldofspectrum.or…

    ... for my Spectrum + for my Harlequin +, and I think that a ...
    Zup Zup July 2013 Hardware
  • DiHalt 2013Hello everyone! from 6 to 7 July in Nizhny Novgorod (Russia) will be held openair demoparty "Dihalt 2013."The program includes the following competit…

    ... / Tutty ^ [Paradise]
    4 - the harlequin / hydrogen
    5 - Death / MadMax ...
    osa osa July 2013 Announcements
  • More Keyboard WoeGot a strange one for ya..... I have a 48K speccy + where the CapsShift key (and any subset of keys that would use CapsShift such as delete, extende…

    Have you tried the 1N4148 diode on the caps shift line? Prolly gone open circuit.
    DEATH DEATH July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... goes to the spectrum. Each diode will drop around 0.7V ...
    DEATH DEATH July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... in this case a standard diode bridge with a smoothing capacitor ... the capacitor used in a diode bridge rectifier circuit.

    Pierre Pierre July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... full load, a typical silicon diode will drop around 1V to ...
    1024MAK 1024MAK July 2013 Hardware
  • Interest in joystick testers?Someone wanted a joystick tester shown in this video: [url]http://www.youtube.com/watch?v=aB9bz7n0vjQ[/url] So now I'm wondering: should I make a ba…

    Lotharek's old SIMPLE KEMPSTON interface also contain led diode working as joystick tester :
    [img]http://velesoft.speccy.cz/zx/divide2k11/divide2k11_through7.jpg[/img]
    velesoft velesoft July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... or
    ............ 1N5817 1A Schotttky Diode e.g. Rapid 47-0824 ... 500mW ZPD8.2 Diotec Zener Diode 500mW 8.2V Rapid 50 ... 0420 or
    ............ BZX55C8V2 Zener Diode 0.5w Do35 8.2v ... br /> ............ BZX55C8V2 8v2 500mw Zener Diode Rapid 47-3024
    LED1 ...
    1024MAK 1024MAK July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... finally, a 9.1V Zener diode could be used instead.
    1024MAK 1024MAK July 2013 Hardware
  • Hello!Hey folks, just checking in ... been a while :) Hope all is well with everyone on the forums. Did I miss much? I know I've not been about these past…

    ... is the new Spectrum Clone "Harlequin".

    May I recommend ...
    Speccyman Speccyman August 2013 Sinclair Miscellaneous
<1…23242526272829…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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