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+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. …
... might look like a 1N4148 switching diode, but it's more likely ... a 12V zener diode.
A few years ... schematic of the ZX+3 PSU, where this things were (AFAIK ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... to fix the ram or psu switching circuit first. Quite often the ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... to fix the ram or psu switching circuit first. Quite often the ... -
Replacing capacitors on a +3 PSUDoes anyone know what kind of PSU does the +2A/B +3 use? Is it a switching one? Judging from it's weight I don't think it must be.... Anyway, I just…
... of PSU does the +2A/B +3 use? Is it a switching ... days (in case the psu is of the switching kind). I'm ... -
Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …
... 'm looking for a modern PSU for my Spectrums and my ... the same? How about switching? Does switching mean by default that it ... is also regulated/isolated? Or switching simply means that it is ... -
General PSU repair guidesNot Speccy related. I'm just looking for a guide as such as to where to begin with a power supply repair. Realise this is a bit of an odd thing to as…
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To my mind a PSU is simple (this is not ... 's me done with a PSU! :D
The unit ... the mainboard even a tiny 'diode' size one, unless its a ... ones inside the BBC Micro PSU actually.
There are four ... -
+2A PSU - power transistor substitute?I used a +2A PSU on a newly acquired Speccy for the first time in quite a while earlier, it was causing apparent issues in that starting the tape dec…
I used a +2A PSU on a newly acquired Speccy ... measure the voltages in the PSU by direct measure on the ... testing the silicon in the PSU it appears the power transistor ... have found a Cisco 1700 switching PSU which should make an ideal ... -
Replacing capacitors on a +3 PSUDoes anyone know what kind of PSU does the +2A/B +3 use? Is it a switching one? Judging from it's weight I don't think it must be.... Anyway, I just…
... of PSU does the +2A/B +3 use? Is it a switching ... and +12V) and a zener diode for the -12V.
[QUOTE ... days (in case the psu is of the switching kind). I'm ... caps in any linear type PSU's.
I think ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... . The voltage drop across a diode reduces slightly when it gets ... .
In some circuits, the switching speed can be affected as ... , test the voltage of the PSU with the Spectrum plugged in ... consider using either a better PSU or a pre-regulator circuit ... -
Modern PSU: picture improvement?I've recently seen advertised some 'replacement power supplies' for Spectrums for which the claim is made that they may make an improvement in pictur…
... ) directly from an external psu. Not the most versatile ... ) Replace +5V regulator with a switching replacement (see Recom, Tracopower, ....). ... could add a (Schottky?) diode to prevent reverse-polarity mishaps ... of course you need a psu + regulator that can handle ... -
Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
... use a 9V PSU should have used a diode for reverse polarity ... CPU RAM. As well as switching either screen area into either ... -
Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
... some connections (and perhaps that diode polarity reversed?). Like Mark said ... minimum. Even though original Spectrum psu may put out ~12V unloaded ... Spectrum itself is allowed: a switching 7805 replacement. To be had ... -
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 -
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 …
... and polarity that the TS2068 PSu has. My unit has no ... PSU, and I was expecting to ... -
Humming psuI have just got myself a +2b and the psu is buzzing like mad. It seems to be working fine, though. It arrived this morning and I have had it switched…
... myself a +2b and the psu is buzzing like mad. It ... -
What PSU is suitable for +2?if I don?t have the original one, what PSU I?ll need for that?
if I don?t have the original one, what PSU I?ll need for that? -
BA157 diodeUsed in Speccies, so not too off topic :P Right, it's a "fast recovery rectifier diode" - can anybody tell me what that means exactly? Fast recover…
... 's a "fast recovery rectifier diode" - can anybody tell me what ... what the difference between this diode and a normal 1N40XX is ... "it's a fast recovery diode" -
+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. …
... where to get the +3 psu schematic? I'm trying to ... a regulator).
The psu outputs 12V but not the ... -
Noisy display faultI've been given an Issue 3 48K Speccy PCB which is in good working order except the main display area has slight changes of shade loosely following a…
... changes of sound from the switching PSU coil).
In my ... one is particularly severe. The PSU coil is quite loud on ... -
kempston and/or psuhi there, just wondering if anyone had a spare kempston adaptor they wanted to give a good home? i will pay a couple of quid + postage for it, and …
... interested in a +2A / +3 PSU, although i realise the likelyhood ... it atm, and my +2A psu is lost, and so needs ... go chucked out) or the psu, but to no avail. however ... -
replacement +3 psuok, who would be kind enough to help an idiot build a replacement PSU for the +3 / +2a , from a PC power supply? Guesser has already helped out a gr…
... an idiot build a replacement PSU for the +3 / +2a , from ... i've found a PC PSU and i've gone out ... at the side of the PSU and looks like this helps ... this page about the +3 psu, and i'm finding it ... -
Can a 48K PSU power a 12K Speccy?Hiya Does anyone know if the 128K speccy (the heatsink one, not a +2 or +3) can run using the same PSU as a 48K rubber keyed jobby? Have been think…
... ) can run using the same PSU as a 48K rubber keyed ... rating on the 128K bundeled PSU is only 400mA higher than ... -
+3 PsuHi all, Just been digging at the back of my wardrobe, and found a +3 PSU the 12V+ and the 12V- works but not the 5V+ has any one got a diagram for a …
Hi all,
Just been digging at the back of my wardrobe, and found a +3 PSU the 12V+ and the 12V- works but not the 5V+ has any one got a diagram for a +3 PSU please.
TIA -
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, …
... read contradictory info on which psu(ie amp rating) is for ... (assuming its not the correct psu)?
I have used tghis ... -
+3 PSU PoorlyI have a +3 that just stopped working. Its the psu thats gone and opening it up discovered a blown fuse. After replacing the fuse it still doesnt wor…
... just stopped working. Its the psu thats gone and opening it ... -
PSU polarityHi! I have a speccy+ psu and somewhere there is a loose connection.I suspect the end to the speccy side. I need to cut the wire and put a new socket.…
... !
I have a speccy+ psu and somewhere there is a ... -
PSU queryHi all, just one quick question. Are Spectrum PSU's compatible with ZX81's? I've just bought an '81 off of Ebay, which was sold as "working, but the …
... one quick question. Are Spectrum PSU's compatible with ZX81's ... machine if it does. Both PSU's are 9 volt, so ... -
+2 grey PSU capacitor changeHi I opened up a +2 grey power supply (2.1A max output) unit in order to replace the aged electrolytic capacitor inside, just like I always do with …
... which is what the sinclair PSU (heatsink 128K 1.85A max ... max output on the grey psu is 2.1A instead of ... -
3rd party psu's?I'm just curious if there is a new easily available none sinclair psu for a spectrum+ that I could get / use ?
I'm just curious if there is a new easily available none sinclair psu for a spectrum+ that I could get / use ? -
PC Build help requiredLadies and gentlemen. I mentioned some time ago about speccing up a new PC to replace my 4 year old AMD x64 doo-dah that I currently have. However,…
... although I am OK with switching cards etc, this is ... my MoBo, CPU, chassis and PSU.
As I ... itself.
The PSU I have purchased (and installed ... 920[/URL]
PSU is this one: -
< ... -Real-Power-M850-Modular-PSU-Quad-PCI-E-6x12V- ...
