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Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…
... sure its between 9v and 12v and can supply upwards of ... -
Possible design fault in +2A/+3 power pack. Fix?It's the second time a +3 power pack ceases to work when I make a short while using the scope to diagnose a +2A/+3 computer. And it's the second tim…
... the max. current taken from 12V would kill 2N2222. It would ... -
Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
... is responsible for filtering the +12V line, which goes both to ... -
Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…
... is responsible for filtering the +12V line, which goes both to ... -
Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …
... is responsible for filtering the +12V line, which goes both to ... -
Are these capacitors the right ones?Issue 3 board [URL="http://cgi.ebay.co.uk/16V-100uF-105-C-electrolytic-radial-Capacitor-X-10pcs-/120526193275?pt=UK_BOI_Electrical_Components_Supplie…
... t'other thread suggests the 12V line can be quite spiky ... -
Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…
... . It was intereference from the 12V switching. But it's fixed ... -
Spectrum 48k on/off switchWanted: Spectrum 48k on/off switch... These originally fitted to the back of the Spectrum, in which the PSU lead plugged into. They incorporated a r…
... 9V (or maybe 5V) and 12V separately instead of the Speccy ... -
Spectrum 48k on/off switchWanted: Spectrum 48k on/off switch... These originally fitted to the back of the Spectrum, in which the PSU lead plugged into. They incorporated a r…
... 9V (or maybe 5V) and 12V separately instead of the Speccy ... -
+2A / +2B / +3 Power Supply QuestionIf I'm going to put a switch in the power lines of a +2B, do I need to switch the +5V, +12V and -12V all off to make it safe to remove peripherals, o…
... to switch the +5V, +12V and -12V all off to make it ... -
+2A / +2B / +3 Power Supply QuestionIf I'm going to put a switch in the power lines of a +2B, do I need to switch the +5V, +12V and -12V all off to make it safe to remove peripherals, o…
... the two +5V and two +12V lines on the pinout diagram ... -
+2A / +2B / +3 Power Supply QuestionIf I'm going to put a switch in the power lines of a +2B, do I need to switch the +5V, +12V and -12V all off to make it safe to remove peripherals, o…
... the two +5V and two +12V lines on the pinout diagram ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... check that the 5V and 12V power rails work. If so ... the voltages seem correct; Aprox. 12V Input and 5V Output.[/quote ... : you have to check the 12V and the -5V power rails ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... check that the 5V and 12V power rails work. If so ... psu I'm getting about 12V. On the 7805 regulator I ... 'm getting those same 12V as input and a steady ... : you have to check the 12V and the -5V power rails ... about -5V on pin 1, +12V on 8, and +5V on ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... about -5V on pin 1, +12V on 8, and +5V on ... -
Flip Screen vs ScrollingWhich do you prefer? I've always liked flip screen games but I had a C64(spit) owning friend who hated them with a passion.
[QUOTE=joefish;515917]Umm. [I]Highway Encounter[/I] [U]was[/U] a flip-screen game.[/QUOTE]
Thats me told +1 Joefish.
Memory is playing tricks on me again, maybe the +12v is wonky :eek: -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... this is not ok. The 12V line should have more than ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... this is not ok. The 12V line should have more than ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... 4000 series chips to translate 12v logic levels to TTL and ... -
Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... as all supply voltages (+5V, +12V, -5V) are OK, there is ... -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
@Diogo
just for fits and giggles have you tried another 'known' plug-pack ?
reading 10v where you should be having 12v is not a good sign at all - infact I am surprised the system semi works. -
2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…
... where you should be having 12v is not a good sign ... -
heatsink on the grey+2anyone ever modded one to run without the heatsink? I know some have on the 48k's but I wouldn't mind removing it from one of mine. If so, any tips …
... supply.
+5v +12v and -12v if memory serves, importantly all ... -
ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... needle kept shooting past 12V on the 12V pins and past 5V ... is because it needs the 12V supply), but the drive light ... -
ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... is because it needs the 12V supply), but the drive light ... -
ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
Ha well good!
hmm... you are giving my ideas. I have an old 144W PSU hanging about. How do you obtain -12V from the PSU?
Edit: Oh wait... Forgot it only outputs 4V and 12VZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... about. How do you obtain -12V from the PSU?
12V[/QUOTE]
Can't ... remember what cable was -12v could be blue. Think -5v ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
... 't remember what cable was -12v could be blue. Think -5v ... is -5v and blue is -12v
Now, I am ...
RED = +5V
YELLOW = +12V
ORANGE = +3.3V
WHITE = -5v
BLUE = -12v
*(most of the ...ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…
...
RED = +5V
YELLOW = +12V
ORANGE = +3.3V
WHITE = -5v
BLUE = -12v[/QUOTE]
Ooo... really... I ...
