-
Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... PSU, the 5V, -5V and 12 V supplies. A missing -5V for example can ... the root cause of the -5V supply not being correct. My ... -
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…
... be adjusted from 0V to 12V (laboratory supply). So you can ... the output is more than 5V and stop in that case ... -
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…
... 'm 99% sure you are missing the +12V. Do you have a ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... to the 4116 RAM chips (+5V, +12V and -5V).
If these are ... -
ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…
... module only uses the main 5V supply, but if you use ... the video circuitry requires the 12V it produces. -
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…
... to work, outputting 5V.
2. Once the +5V rail supply is ... converter, begins to generate 12V and -5V supply rails to feed lower ... DC-DC converter uses the +5V supply, so this stage cannot ... is.
4. Only after +5V rail, ULA and lower RAM ... -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... on IC14 should I find 12V? I checked all pins on ... and some show 12V. The lower RAM shows 12V and 5V on all ... -
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. …
... as either 2V or 2.5V and the minimum input voltage ... as either 7V or 7.5V with the output still meeting ... and the +5V rails to generate the -5V and +12V rails.
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 …
... to say, are the +5V, -5V and +12V supplies in the correct range ... .
Is the +5V supply free ...Barn Find #1Hi, just back from holiday and found a load of spectrum related bits in my folks old barn. They would probably have been a mates who dumped a load of…
... involved in the internal +12v and -5v power supply generation have been ...Transistors 101Hi, Im a complete novice when it comes to electronics and would appreciate any help that can be given. Im replacing the transistor that sits on to…
No +12V (or a very low voltage) ... , +9V input, +5V (from 7805 voltage regulator), +12V and -5V generated by the ...Opus Discovery PSU[IMG]http://www.scotek.net/zx spectrum/opus.jpg[/IMG] This is a photo of my Opus Discovery transformer. Can anyone tell me what the connections are …
... .
Yellow must result in +12V DC at the end, so ... .
White must result in +5V DC at the end, so ...Opus Discovery PSU[IMG]http://www.scotek.net/zx spectrum/opus.jpg[/IMG] This is a photo of my Opus Discovery transformer. Can anyone tell me what the connections are …
... .
Yellow must result in +12V DC at the end, so ... .
White must result in +5V DC at the end, so ...Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…
... PCB border = 4,98 V (+5V)
7805 middle leg black ... 7805 leg = 11,68 V (+12V)
(Both Spectrums "not ...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. ... TR8 detects that the +12V line is low, the ... occurs to generate the -12V and -5V power rails.
... is connected to the +12V line and the voltage ... the actual voltage on the +12V line.
...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…
... ;717339]QUOTE
"Using your 12V regulated PSU, connect it to ... up the TEA2000 and the +12V feed to the RGB / Video ... /> END QUOTE
Connected 12V to R8/L1 .
It ... ohm resistor will drop 5.5V (voltage across the resistor) at ...Anyone using an RGB SCART cable with a +2A/+3 and LCD TV?In [URL="http://www.worldofspectrum.org/forums/showthread.php?t=44697"]a recent thread[/URL], I mused: [quote]Can +2As be composite modded? If so, I…
... need to "steal" a +5V or +12V supply from elsewhere and feed ...Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
... chips needs three supply lines (+5V, +12V and -5V plus 0V/ground) and ... (and only need a single +5V supply). These can be replaced ...Beta Disk MicroP 3.5 Disk Drive DIN Connectors signalsHello, I own a Beta Disk with an 3,5" Disk Drive from MP (MicroP) which has two DIN Connectors. One is a DIN Connector with 5 Pins, the other a DI…
... . Red cable is +5v, yellow cable is +12v and black cable is ... the littler board makes the +5v and +12v. The disk driver takes ...48k+ Power Supply quickieGuys, Can someone tell me if I can safely use the power supply of the 48k+ in a 48k? My guess is yes, but I don't want to do something I will regre…
I'm using an universal 60W 5v-12v selectable PSU (P.SUP.EU60W)
The 8v setting keeps the temperature of my standard 48k down.
I've paid around ? 20,-
Rudyspectrum 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 …
... /> 9V input, +5V, +12V and -5V.
Also check the +12V supply to the ...ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... the Z80 clock, you avoid missing bits because of the ULA ... from the ZX clock to 5V.
Now everything works perfectly ...RF Modulator, not Astec UM1233While repairing a +2A board (D4 burnt out, so the WAIT signal from the gate array didn't reach the CPU and hence, the CPU was running full speed even…
... gate array pin to pull 5V to the anode of D4 ... side by side with the +12V power rail :o ... one milimeter ... you'll end up shorting +12V and WAIT with the connector ...Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …
... , supplied directly with regulated 5V, 12V and -5V from a PC PSU, with ...+3 on GT65I got the green Amstrad monitor GT65 and I was wondering , it can be connected to the spectrum +3, completely (power supply and video)? I saw that th…
... and cpc 6128 use 5V for computer and 12V for the disc ...+3 on GT65I got the green Amstrad monitor GT65 and I was wondering , it can be connected to the spectrum +3, completely (power supply and video)? I saw that th…
... monitor, which supplies the 12v. The 5v is supplied again by the ...Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…
Just to be clear, we mean the +5V, the -5V and the +12V supplies to the 4116 DRAM chips.
[B][I]Mark[/I][/B]Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…
... should be getting -5v on pin one, 12v on pin 8 and ... +5v on pin 9. You ... uses this to derive the +5v, -5v and 12v.Another broken SpeccyHi all I have been given another ZX Spectrum, this time it has a really odd problem as you can see in the video: [URL="http://youtu.be/ZOSiBEYQD7w"…
... should be getting -5v on pin one, 12v on pin 8 and ... +5v on pin 9. You ...
