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A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
... that there is no +/-12V and -5V at the associated pins of ... interface which uses also the +12V line. An additional DC-DC ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
Note that there is no +/-12V and -5V at the associated pins of ... interface which uses also the +12V line. An additional DC-DC ... -
Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…
... .
The -5V line (to "B20") and the -12V line (to "B23 ... -
Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…
... .
The -5V line (to "B20") and the -12V line (to "B23 ... -5V, 22B or B22 is +12V and 22B or B22 is 12V AC = "-12V ... -
Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…
... -5V, 22B or B22 is +12V and 22B or B22 is 12V AC = "-12V ... twice! :oops: The latest one (-12V) is definitely at 23B/B23 ... voltage to be directed to -12V"? Isn't it a stable ... -12V? And isn't that (stable) ... -
Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…
... br /> The -5V line (to "B20") and the -12V line (to ... 5V, 22B or B22 is +12V and 22B or B22 is 12V AC = "-12V ... you have labelled the -12V output from the DC/DC ... converter as "-5V ==> B20" and ... of the 79L05 regulator as "-12V ==> B23"...:o
... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... connector must contain GND and +5V pins on correct position (some ... old kempston joy interfaces use +5V instead GND pin and GND ... code) but I must be missing something as ports 0x1F & ... -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... [B]IC23[/B] (74LS32) to +5V. That will disable the "upper ... br />
Well, applied the 5V to pin 5 of IC23 ... saw that the -5V (minus 5 V) was completely missing. I forgot ... br />
Then applied the 5V on pin 5 of [B ... I don't apply the 5V to pin 5 of IC23 ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
followed the instruction video all looks okay but still no -5V or 12V.
Could my replacemet transistor be the cause of this ?
Gets real hot very fast. -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
...
[LIST]
[*]Cutting the +12V track between the power supply ... ,
[*]Using an external +12V and -5V supply (if you have one ... ) even better if the +12V is ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... is very low for the +5v rail. What voltage are you ... he had 5V on the 5V rail...
'Tis the 12V that is ... 4.3V :(
And the -5V is ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... PIN 8 and PIN 9. ( 12V and 5V )
And gave it ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... he had 5V on the 5V rail...
'Tis the 12V that is ... 4.3V :(
And the -5V is ... -
Diagnostic Board (Winston designed) PCB'sHi everyone, I had these made earlier in the year, built mine then promptly mislaid the others until now :) and I'd like to offer these to the commu…
... , I do basic check + - 5v and 12v are fine, have some bars ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... the loaded input voltage was 12V or higher.
There is ... yours if working: check the -5V line. If it is within ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... the loaded input voltage was 12V or higher.
There is ... yours if working: check the -5V line. If it is within ... /> My minus 5V is actually -5.01V and 12V is 12.33V ... -
AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... don't use the +12V or the -5V supplies generated by TR4 ... does NOT use the +12V or the -5V supplies. It uses the ... +5V supply from the Spectrum. In ... -
Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... power is required for the +5V rail, could you please explain ... consumed most current from the +12V rail.
[B][I ... -
Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... I can measure the +5V rail current and then we ... current used by the +12V, and -12V rails comes from the ... "+9V" input and not via the +5V ... keypad runs off the +12V line, it will not ... or less) from the +5V rail. Anything even slightly ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... chips is -5v on pin 1 (top left), +12v on pin 8 ... (bottom left), and +5v on pin ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... between -4.5V and -5.5V)
Pin 8, VDD, +12V (Should be ... between +11.5V and +12.5V ...
Pin 9, VCC, +5V ... " conductor.
If the +5V supply is greater than 5 ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
Good, the +5V supply line is back within ... redo the tests for +12V and -5V as shown [URL="http://www ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... have any affect on the +12v and -5v rails. They're definitely ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... the red lead to the +12V line and report back what ... /> Do the same for the -5V line, but you need to ... leads around (black to the -5V supply line, red to 0V ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... be shown connected to the +5V supply, NOT to the junction ... and retest all the voltages (+5V, +12V and -5V).
That's ... -
Differences between 128k+ and +3 RGB video circuitsHello, Have a bit of a dilema with some strange video results on my +3. Here's my setup: I have a RGB Scart to Component converter that is hooked up…
... is that there is a 12v supply, without that the TEA2000 ... D6-D22 I'm getting 5V.
TEA is getting +12Vanalog ... . CV out on TEA2000 getting 5V.
R, G, B ... -
48k PSU Alternatives & DivIDE v DivMMCHey folks, The 48k Speccy I got rather recently is missing it's power supply (though, I know it's working from testing it with the power supply from…
... load" output voltage between 8.5V to 9V and with the ... output) voltage no more than 12V.
And as stated ... -
48k PSU Alternatives & DivIDE v DivMMCHey folks, The 48k Speccy I got rather recently is missing it's power supply (though, I know it's working from testing it with the power supply from…
... load" output voltage between 8.5V to 9V and with the ... output) voltage no more than 12V.
And as stated ... -
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 …
... this can be up to 12V DC). The voltage on the ... that you still have a +12V supply because current flows from ... "+9V" input line to the +12V line.
So ... and the +12V line is the same, but the -5V is wrong ... .
If the +12V line is good and the ... -
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 …
Just try changing C46 (1uf, 50v) first, if you're sure about the Zener. I've seen this take out a -5v rail also.
I've not known a coil failure to take out -5v without also losing +12v, although stranger things have happened.
B
