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  • Specdrum SyncroI'm having trouble syncing my (revision 4b)48k specdrum. The sync pulses sent out of the MIC socket are low, barely +50db, and isn't powerful enough…

    It's supposed to be a 10nF axial ceramic. It looks like a resistor and has coloured bands on it. It's even the same shape as a resistor -()==()-.
    apprenticemart2 apprenticemart2 September 2009 Hardware
  • Specdrum SyncroI'm having trouble syncing my (revision 4b)48k specdrum. The sync pulses sent out of the MIC socket are low, barely +50db, and isn't powerful enough…

    That's what I mean... Sinclair used capacitors like that for a while - they look exactly like a resistor, but they are capacitors. The colour bands indicate the value.
    Winston Winston September 2009 Hardware
  • Specdrum SyncroI'm having trouble syncing my (revision 4b)48k specdrum. The sync pulses sent out of the MIC socket are low, barely +50db, and isn't powerful enough…

    ... ,but never with the characteristic resistor shape.
    So these must ... read exactly like a resistor then?

    Brown/Black ...
    apprenticemart2 apprenticemart2 September 2009 Hardware
  • TV output from original +2I've modified my 48K Spectrum to output composite, and I have it working here in Japan on my old monitor (X68000). Hopefully my parents will bring ov…

    ... a BC337, a 75 ohm resistor, and a capacitor.
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... simple - it's just a resistor and a capacitor. The circuit ... a relatively large capacitor and resistor, it's very slow, so ...
    Winston Winston September 2009 Development
  • RBG monitor for Spectrum?I'm using a very old TTL RGB monitor with my Spectrum, with a RGB adapter that I made many years for my Sinclair QL. It works perfectly with my QL, b…

    ... MONITOR. Anyway, i removed a resistor in the monitor circuit and ...
    0sAND1s 0sAND1s September 2009 Hardware
  • RBG monitor for Spectrum?I'm using a very old TTL RGB monitor with my Spectrum, with a RGB adapter that I made many years for my Sinclair QL. It works perfectly with my QL, b…

    ... MONITOR. Anyway, i removed a resistor in the monitor circuit and ... /> Interesting, I m curious what resistor was, do you remember?
    xc8 xc8 September 2009 Hardware
  • RBG monitor for Spectrum?I'm using a very old TTL RGB monitor with my Spectrum, with a RGB adapter that I made many years for my Sinclair QL. It works perfectly with my QL, b…

    ... ]Interesting, I m curious what resistor was, do you remember?
    I *think* I disconnected the resistor R266 (section E7, page 7 ...
    0sAND1s 0sAND1s September 2009 Hardware
  • I bought my first ZX Spectrum 48k, now what ?Hi guys ! I recently go to Brussel in Belgium and found a ZX Spectrum at a "flea market" (sorry, I don't the correct word for that, let's call it a …

    ... do by one 75 Ohm resistor near the SCART socket. You ... cut one leg of this resistor and you have one High ...
    Gods Gods October 2009 Hardware
  • ZX spectrum - Make a component cableHello! I have this ZX Spectrum with a faulty RF-modulator, It is good for max 2 minutes and then the picture starts getting bad. Real bad. BUT I got …

    ... could try to insert a resistor of 47 ... 82 Ohm in ...
    ingo ingo October 2009 Hardware
  • Ahh.. the tape loading era! by ate bit[url]http://www.pouet.net/prod.php?which=53846[/url] It is UNBELIEVABLE!!! Effects while loading, MUSIC while loading (and loading normal speed !!!…

    ... am pretty sure that the resistor-solution was not left out ... general, sorry) fact that a resistor is cheap but that finding ...
    roko roko October 2009 Sinclair Miscellaneous
  • +3 sound cureHi all, As most of us know the Spectrum+3A has this sound problem, distortion. The +3B had this problem fixed. I done some looking at the circuitry l…

    ... via R45=75 Ohm. This resistor is absent. Instead of it ...
    ingo ingo October 2009 Hardware
  • +3 sound cureHi all, As most of us know the Spectrum+3A has this sound problem, distortion. The +3B had this problem fixed. I done some looking at the circuitry l…

    ... (1?F). Instead place a resistor of about 2.2kOhm or ...
    ingo ingo October 2009 Hardware
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    ... though to find the new resistor values that are suggested. Memories ...
    Winston Winston October 2009 Hardware
  • An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…

    ... DAC can be a simple resistor network. It wouldn't even ...
    Winston Winston October 2009 Hardware
  • Tuning issue 48KHi. I have just bought a 48K rubber key version and am having trouble tuning it in. I have tried two newish CRT televisions but get the same picture.…

    ... over a 100 - 200 Ohm resistor direct to this connector. Then ...
    roko roko October 2009 Hardware
  • Tuning issue 48KHi. I have just bought a 48K rubber key version and am having trouble tuning it in. I have tried two newish CRT televisions but get the same picture.…

    ... over a 100 - 200 Ohm resistor direct to this connector. Then ...
    crazylarry crazylarry October 2009 Hardware
  • Replacement loudspeaker for rubber key 48kI'm fixing one of my rubber key 48k. Just ordered a membrane for it but I also need to find a replacement loudspeaker for it. The original some how q…

    ... it was (without an additional resistor). I loaded up (divide+) Zynaps ... /> I then installed an 8Ohm resistor on the speaker and tried ... impedance using an approriate value resistor (depending on the impedance of ...
    gtsamour gtsamour November 2009 Hardware
  • winston's diagnostics boardHi Winston, I've recently built your diagnostics board on project board and am having huge problems getting it running. I've been pulling my hair ou…

    ... it with a pull-up resistor between the gate of Q1 ...
    Winston Winston November 2009 Hardware
  • PentEvo/ZX Evolution PreviewCheck this -> [url]http://www.youtube.com/user/3ASOFT[/url] some Videos showing the PentEvo/ZXEvo ([url]http://www.nedopc.com/zxevo/zxevo.php[/url])…

    ... bug in the video circuitry (resistor values f**ked up, resulting ...
    RetroTechie RetroTechie November 2009 Hardware
  • Composite video and reset buttonOK, I've got some Kempston clone interface here, and I've added a phono socket and a small momentary switch to it (ages ago but forgot about it) . :)…

    ... side of a 75 ohm resistor, the other side to GND ... signal is present at the resistor connections. You can use a ...
    mcleod_ideafix mcleod_ideafix December 2009 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…

    ... ,7 kOhm and an additional resistor of 10 kOhm from pin ...
    ingo ingo December 2009 Hardware
  • need help with +3 sound mod..well my friend has been doing the mod.. and well informed me the info / instructions aren't 100% there.. basically the matrix of cap's / resisters i…

    ... from the AY to the resistor network as per the circuit ...
    nuggetreggae nuggetreggae January 2010 Hardware
  • Which ZX Spectrum setup?I'm building a semi-pro laser setup, with.. a ZX Spectrum as controller! [url]http://gathering.tweakers.net/forum/list_messages/1297705[/url] (I'm no…

    ... -type flip flop with your resistor ladder on the output (74HCT574 ... equivalent using a '574 plus resistor ladder as a DAC, you ...
    Winston Winston January 2010 Hardware
  • Loading program over the MIC jackI put the plug into the wrong jack and loaded a program over the MIC jack. Is it possible that the ZX 48K is damaged because after a while the pic c…

    ... you need to add one resistor to ground to complete the ... charge. This resistor is present in the EAR ... the MIC socket. Sometimes this resistor is also present on some ...
    Gods Gods February 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... misplaced component: the 75 ohm resistor was placed between emitter and ...
    Zup Zup March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... diodes, and with a variable resistor in the output I can ...
    Zup Zup March 2010 Hardware
  • Modding / repairing a +3I've got a +3 and I'm repairing and enhacing the computer. The enhacements I've done so far: - A slightly buggy video composite output. - Repairing …

    ... mod (put a 470 ohm resistor between D7 of IC4 and ... or becomes unstable, remove the resistor and leave it as before ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Modding / repairing a +3I've got a +3 and I'm repairing and enhacing the computer. The enhacements I've done so far: - A slightly buggy video composite output. - Repairing …

    ... much the same, putting the resistor was easy, but desoldering components ...
    Zup Zup March 2010 Hardware
  • Determining +3 revisionI have two +3's and have only just got around to inspecting the insides to look for the known +3 sound "bug". The problem is that one machine appear…

    ... connected to a 220 ohm resistor (red-red-brown).

    Zup Zup March 2010 Hardware
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