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Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
Which items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt?
Micky -
+2/+3 Sync problem on Commodore 1084sI have a strange issue, I got an RGB monitor cable from ebay for the +2/+3 to the Commodore 1084s (d-sub socket). It works fine on my Spectrum+ 128k …
... and 5 both provide a 12 volt supply that you could use to ... -
Power adaptor for a Sinclair 128kHi, just a quick question. Would a 48k spectrum+ power lead work for a 128k Sinclair Speccy, I have both but the power does not work on the 128k, I n…
... ratings are 'maximums' that the supply can deliver before becoming unstable ... scenario, the 1.4A power supply would need to work harder ... from a 0.5A rated 12 volt supply... :(
Someone on here ... -
+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... you still need the 9v supply to generate the other voltages ... is isolate the internal power supply circuits entirely and inject the ... still present in the power supply circuitry to get it out ... you can just use a 12 volt supply with no other modifications, and ... -
128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…
... the appropriate voltage from the 12 volt supply in the spectrum, and fit ... -
+2A PSU ResurrectionHi all. I have a couple of +2A machines and a +3 with PSUs for each but I'm having a problem with one of them. I've replaced the internal glass…
... diodes can comfortably handle. The 12 volt supply in the +3 PSU is ... -
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…
... zx spectrum +2A power supply that the -12v rail ... voltage .. any suggestions / power supply info .. as far as i ... can make out the supply converts from 240v AC ... then it goes into the 12 volt reg .. which is fine ... and goes to the 5 volt and -12v rail ,,, ... -
Original rubber key 48k'sThis question is to some point academic; But i seem to remeber the original 48k Rubber Keys Speccy came in versions 1,2 & 3! (way back when, occasi…
... problem with the internal power supply is that one of the ... loss of the -5 volt and +12 volt supplies to the RAM and ... -
Getting a DISCiPLE/+D to work on a +2A/+3?Does anyone know how compatible the two interfaces could be made with the +2A/+3? I remember that there were a couple of POKEs that could get a +D t…
... the chips), and the 12 volt line on pin 21 ... system contains a power supply which also powers the ... back through the 9 volt line,
eventually ... own
-'power supply back into the Spectrum, let ... will
supply one with the 12 volt track cut. It ... -
spectrum PSU'sI've read contradictory info on which psu(ie amp rating) is for which spectrum. :confused: The models and amp ratings are 1.2A, 1.4, 1.85 and 48k, …
... PSU might yield 11 or 12 volt when not plugged to a ... Spectrums need only one 9V supply, I'm not sure it ... -
component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…
... to use an external power supply for +5v only (replace 8 ... is your problem with the 12 volt?
Micky -
component out?I would like to connect ZX48K to plasma TV with component cable. I read somewhere that signals are on the expansion edge connector. Do I need somethi…
... mod requires the LM1889 to supply the chrominance information. The only ... is your problem with the 12 volt?[/quote]
I guess he ... -
The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... case, the 4116 requires THREE supply voltages. They must be ... The -5 volt supply must come on before the +12 and +5v supplies ... the extremely fragile switch mode supply on the Spectrum's ... replace the 4116s with single supply chips (either a daughterboard with ... -
Does a spectrum +2 power supply work on a +3?tiny question, does a spectrum +2 power supply work for a +3?
... upto a PC ATX power supply - perhaps even a 60watt ... -MINI-ITX-ATX-PC-Power-Supply-/220947643658?pt=LH_DefaultDomain_3&hash ... .co.uk/itm/12-Volt-60W-5A-DC-DESKTOP-POWER-SUPPLY-12v-PSU ... &hash=item3a6c68df58]12 Volt 60W 5A DC DESKTOP POWER SUPPLY ?7.49 ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
I have a 1 AMP 3.3, 6, 9, 12 Volt power supply. I have no resistors left that can handle that amount of juice (3W+). What was the intention for this? To burn away the short? -
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…
... an Micro-P Floppy Power Supply for QL on ebay:
15 Volt 850mA
and
9 ... Volt 550mA
This maybe ... this to the standard 5 Volt and 12 Volt for the floppies.
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... issues)
From Newsletter 12 ,Block 5 ,page 1
supply for one one two drives ... , though"..... He showed me the 12 volt rectifying diodes were a lovely ...ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…
... a +2a/b/3 power supply, which I suppose could be ... those anywhere as there +5/-12/+12 volt with a din plug..
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... because it exposes the power supply if you forget about it ... is in series with the 12 volt input, and the output voltage ... TV sees is
[code]12 * (75 / (75 + R44))[/code].
12 volt signal which is what you ...ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... volt supply)
lower right 1.12 (5 volt)
upper left 1 ( -5 volt ... zero (0 volt supply)
lower ...Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…
... and the adjacent 1.8 volt supply traces off the board. No ... proves is that 3.3 volt chips work fine with 5 ... volt Z80s, even CMOS ones (they ...It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... 's getting it's 5 volt supply from) makes the Speccy do ...Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…
... TEA2000, and it gets not 12 Volt, but only 1.4, so ... is in reality +11.4 Volt (but the same also with ...Two-resistor fix for +3 sound distortionOver at Zonadepruebas, mcleod_ideafix has done a circuit analysis of our favorite distorted sound output: the issue 1 +3 AY chip sound output, and fr…
... output voltage up to 1 volt peak-to-peak and the ... is powered by a 5 volt supply. After simulating the original circuit ...ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... have to go from 12 Volt DC to 9 Volt DC. I am ...Spectrum 128K: distorted picture with composite to vga converterI'm trying to get my 128K Spectrum (toastrack) to work with a vasmon3 composite to vga converter, but all I get is a distorted image on the VGA monit…
... is about 10,7 volt and the 12 volt signal is about 11 ... .8 volt.
Picture of ...Silly question I know..Just started checking my old computers and started with the ac/dc power adaptors. The 9 volt output is showing 12 to 13 volts The 12 volt output is…
... 13 volts
The 12 volt output is showing 13 to ...Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…
...
O volt rail-----0
+5 volt rail----0.8 ...
-5 volt rail----80.1 ... on 2K range
+12 volt rail---850 ohm
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Bootable emulator?Just had a look at the page of the 'bootable emulator' by Emanuele. Sadly, the translation from Italian to English by Babel Fish leaves much to be de…
... " (ie connecting it to the 12 volt battery of my car) I ...When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…
... and modulator, and of course 12 volt making circuit. All it because ...
