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Search Again :: Adv Search 1000 results in 0.002s
<1234567…34>
  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector? Firstly, if they use +9v they won't work on a +3, since the +3 does…

    Do any peripherals use the +12v, -12v or 9v lines exposed at ... traces down to pass the +12v/-12v through, so I'm looking ...
    Winston Winston March 2008 Hardware
  • 12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…

    I found this simple dc-dc converter:
    [url]http://www.mcrent.com/workbench/dcdc1216/[/url]
    it converts 12V to 16V, can it be used to produce 9V by modifying R1 and R2?
    is there some better solution?
    orange orange October 2012 Hardware
  • Spectrum +2 grey 12v railHello everyone, I have this grey +2 with no video from tv. After much reading and testing i realized it was the internal power supply. At the 12v ra…

    ... internal power supply. At the 12v rail to tea2000 and serial ...
    palex palex November 2012 Hardware
  • 12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :( I do however have a 12v 2amp PSU, if I reverse the polarity so t…

    ... /> I do however have a 12v 2amp PSU, if I reverse ...
    stu232 stu232 April 2014 Hardware
  • 12V Rail - Spectrum 48kOkay - I may just be having a senior moment here, but I'm running out of ideas. I'm working on a Spectrum Issue 4S board,and have had to remove al…

    ... -5V are fine, but the 12V rail is at almost 25V ... , and the rail there was 12V as expected.

    Has ...
    Graham Graham November 2015 Hardware
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…

    ... on and measured the voltages, 12v was giving me an extreme ... on with the ram removed. 12V line was fine with a ... the picture. Looked at the 12v line and there is a ... lower ram ic's the 12v line is ok but when ... causing the instability in the 12v line, it's ruining the ...
    patzik patzik April 2016 Hardware
  • ZX Spectrum Issue 2 - 12V badHey there, I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. Overall the machine was generally working when I recieved it, bu…

    ... vertical lines. Turned out the 12V line is bad (along with ... (eliminating the need for -5V/-12V) according to this http://www ... cathode of D15 and feed 12V with a second PSU. However ... D15 soldered in place, the 12V line gets ~8.4V-8 ...
    Shockwav3 Shockwav3 December 2017 Hardware
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…

    ... are all right but the 12V line measures roughly two volts ... the other place that uses 12V is the LM1889, which is ...
    protek protek July 2020 Hardware
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

    ... +2A power supply that the -12v rail seems to be missing ... ok, i have changed the -12v regulator (79L12) no change then ... to the 5 volt and -12v rail ,,, confused.com
    i ... realize that the -12v is not strictly required for ...
    mark8bit mark8bit November 2020 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    Check DC voltage at C911 (about 12V), check voltage at Pin3 of IC909 (5V).
    Try to add about 100?F to C911. Use an AC voltmeter and measure at C909. You should measure not more than some mV (
    ingo ingo September 2008 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    ... DC voltage at C911 (about 12V), check voltage at Pin3 of ... measure not more than some mV ( 11.97

    [B ...
    odious odious September 2008 Hardware
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    ... , are the +5V, -5V and +12V supplies in the correct range ... (use a multimeter on AC mV or better, use a oscilloscope ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... input voltage from the +12V line is reduced proportionally. This ... TR8 detects that the +12V line is low, the ... TR8 sees are only mV and don't last long ... which should rapidly charge to +12V.

    A ... occurs to generate the -12V and -5V power rails ...
    1024MAK 1024MAK August 2013 Hardware
  • spectrum issue 6a oddityMorning everyone Bought a speccy (rubber key) from ebay in near mint condition - couldn't tune in on analogue particularly well so did the comp mod …

    ... via the AC mV range).
    9V input, +5V, +12V and -5V ... .
    Also check the +12V supply to the LM1889 chip ...
    1024MAK 1024MAK September 2013 Hardware
  • Display bandsHi all, I'm busy working on an issue 3 16k Spectrum I picked up on eBay. I've upped it to 48k and put a new membrane in. I noticed the display was…

    ... multimeter. Can you test the +12V supply that feeds the LM1889 ... voltage. Then switch to the mV or V AC range and ...
    1024MAK 1024MAK September 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…

    ... over 20 mV for +5V and 50mV for -5V and +12V. I ...
    Opus Discovery Opus Discovery 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

    ... ripcord ( typical voltage drop 40 mV / A m ): 5V and ground ... each and 1 each for +12V and -12V.
    [img]http://s6 ...
    Dan Antohi Dan Antohi September 2015 Hardware
  • What's the best solution for audio loading on a 48k?I have three 48k Speccies. All have been recapped and AV modded, but only one (an issue 4A) is currently loading via Teezix. (the other two (issue 3…

    ... output levels of some ten mV (it was used in tape ... , also his circuit runs off 12V. But the principle is what ...
    RobeeeJay RobeeeJay May 2016 Hardware
  • what are exact current values on +2A's PSUI like to know what is written on an original +2A PSU nearby each voltage. I mean the current for +5V, the current for +12V and the current for -12V.…

    I like to know what is written on an original +2A PSU nearby each voltage.
    I mean the current for +5V, the current for +12V and the current for -12V.

    Thank you.
    Best wishes,
    Cristi
    secarica secarica January 2003 Sinclair Miscellaneous
  • The Spectraphite's Personality - Take the TestOkay, I'll go first *ish* [B]Disorder | Rating[/B] Paranoid: Very High Schizoid: High Schizotypal: …

    ... ://www.4degreez.com/misc/personality_disorder_test.mv"]Take the TEST[/url]
    Sadako Sadako February 2004 Sinclair Miscellaneous
  • TS2068 PSU?Just wondering what is the voltage and polarity that the TS2068 PSu has. My unit has no PSU, and I was expecting to either use my Spectrum 12V power …

    ... to either use my Spectrum 12V power brick or some multivoltage ...
    Akira Akira March 2004 Sinclair Miscellaneous
  • SDP: Floppy adaptors available to contributers !!!Hi folks, I've got a few more of those plus 3 adaptors that will allow you to read and write your 3" disks. The aim is to get you all motivated int…

    ... the cable because 5v and 12v are reversed on the +3 ...
    Andrew Barker Andrew Barker March 2004 MIA/STP/SDP
  • +3 Power Supplyg'day everybody. sorry to be asking for help in my first post (i know it's a tad rude), but how "generic" is the +3 power supply? does it supply mult…

    ... it just a standard 9/12V power pack? also, the connector ...
    ma3a_operat0r ma3a_operat0r June 2004 Sinclair Miscellaneous
  • Spectrum setY still have a ZX Spectrum (48k) (Europe) with a lot of accessories Cassettrecorder Interface 1, Microdrive Multiface 1 Kempston- Interface, Joysti…

    ... additional power supply +5V u. +12V as usual at PC )
    gekarb gekarb September 2004 Sales
  • +2A ProblemHi ! I just got a +2A and it has a powerup problem. When I turn it on it just displays 1987 1987 over the first few lines and a random attributes p…

    ... , two pins with +12V , one pin with -12V and the middle pin ... only has ONE pin with +12V, the other one is 0V ...
    Tom-Cat Tom-Cat May 2005 Sinclair Miscellaneous
  • 3" floppy in pcI'm in need of some assistance. I have attached a 3" floppy to my pc using a cable as described at [url="http://newton.sunderland.ac.uk/~specfreak/F…

    ... floppy has the +5v and +12v wires switched), I have also ...
    jagman5994 jagman5994 September 2005 Sinclair Miscellaneous
  • Spectrum +2B on a PC PSUHello, Id like to attach my Spectrum +2B to a PC Power Supply. Im currently using an ATX power supply with my Amiga CD32. I searched on here for so…

    ... ) two +5V points, two +12V points, one -12V point and one Ground ... 5v line, and both +12V to the 12V line.. but, do I ... have to connect the -12V, and if so, how do ... this as there is no -12V on the molex connector?
    chaoticjelly chaoticjelly January 2006 Hardware
  • Interface1 problem.I just bought one. Problem is, I plug the thingie in one of my argentinian clones and the machine seems not to run a single Z80 cycle. The screen is …

    ... a voltage inverter/doubler (for + - 12V).
    Anyone knows some "IF1 ...
    Marcelo Marcelo March 2006 Hardware
  • +3 psu schematics and partsHi everyone. Does anyone have or knows where to get the +3 psu schematic? I'm trying to repair one but i cant find any info on the parts reference. …

    ... ).

    The psu outputs 12V but not the 5V. As ...
    odious odious June 2006 Hardware
  • Help with a pc speaker problemI recently was given a 19" Hansol Mazellan 900p CRT Monitor which replaced my old Packard Bell smaller monitor. The speakers i have are fairly ancien…

    ... new monitor doesnt have a 12v output socket and i was ...
    festershinetop festershinetop September 2006 Chit chat
<1234567…34>

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Related Threads

  • +12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector?<br /> <br /> Firstly, if they use +9v they won't work on a +3, since…
  • 12V -> 9VI found this simple dc-dc converter:<br /> [url]http://www.mcrent.com/workbench/dcdc1216/[/url]<br /> it converts 12V to 16V, can it be used to produ…
  • Spectrum +2 grey 12v railHello everyone,<br /> <br /> I have this grey +2 with no video from tv. After much reading and testing i realized it was the internal power supply. A…
  • 12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :(<br /> <br /> I do however have a 12v 2amp PSU, if I reverse the p…
  • 12V Rail - Spectrum 48kOkay - I may just be having a senior moment here, but I'm running out of ideas.<br /> <br /> I'm working on a Spectrum Issue 4S board,and have had …
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
  • ZX Spectrum Issue 2 - 12V badHey there,<br /> I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. <br /> Overall the machine was generally working when I rec…
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

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