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Voltage regulator replacement?I have an 48K issue 3B that has (for unknown reasons) had one of the legs on the voltage regulator broken off. It looks like a simple replacement job…
... of the legs on the voltage regulator broken off. It looks like ... could do.
The regulator is marked:-
[code]T ... -
Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …
... odd reason ripped off the Voltage Regulator and heatsink. Is there anything ... -
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…
... to me with the voltage regulator hanging around,
... the three pins from the voltage regulator tear off.
voltage regulator was soldered.
The voltage regulator has printed "F M0247 MC7805C ... -
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…
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It acts as a voltage regulator undoubtedly but I am wondering ... -
how to set voltage regulator to the correct setting ?On the power supply that is broken it says AC adapter INPUT : 230v 50Hz OUTPUT ; 9v 200mA Regulated On the variable voltage adapter i have the…
... />
On the variable voltage adapter i have there is ... do to set the correct voltage ? -
Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…
... machines used the same 7805 voltage regulator but totally by accident I ... uses an 78S05 regulator which is a 2A regulator. That got me ... showing a regular GL7805 (1A) regulator, and the ones on my ... service guide...
"78S05 2A regulator can be used, but hardly ... -
ZX Spectrum Pre-regulator DesignCarrying on from the "[URL="http://www.worldofspectrum.org/forums/showthread.php?t=44486"]Issue 2 crashes after about 30 mins[/URL]" thread... [QUOT…
... dissipated by the 7805 internal voltage regulator and heat sink.
< ... br /> Instead, the pre-regulator circuit helps out with the ... br /> Output voltage from the [U][B]Pre-regulator[/B][/U] ... br /> Output voltage from the [U][B]Pre-regulator[/B][/U] ... -
Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... kits)
[b]Voltage regulators:[/b]
I known ... is a 78S05 5v 2a voltage regulator in the +2, ... 5v 2a switch mode regulator in order to reduce ... to replace its legacy regulator, or whether to use ... 5v 1a switch mode regulator. Similarly, I also ... -
About the Disciple heat problem.I was wondering if anyone knows how to solve the problem that Disciple interfaces have that start losing it after some time of usage. I know that the…
... with a sinkcooler on the voltage regulator but I don't know ... -
Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…
... should imagine that the 7805 voltage regulator and [drink spill induced] keyboard ... -
Did all Spectrum 128Ks have that large heatsink?Question as per title. I can't seem to find the answer to this. I'm sure I've seen a picture of one without it. Would this be because someone has car…
Question as per title. I can't seem to find the answer to this. I'm sure I've seen a picture of one without it. Would this be because someone has carried out a voltage regulator mod in order to do away with the need for it? -
PC power source and Spectrums.I'm planning to use a basic PC ATX power source (300W) for all my sinclair equipment, but I have two questions: - I've read about some nasty things …
... the 7805 or use another voltage regulator to get +9v? A 7809 ... be enough, so what other regulator?
- And (not related ... -
+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…
... on it. Looks like a voltage regulator. Has anyone got one of ... -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... , full check of voltages, new voltage regulator, new membrane... Also added a ... post/website on a better voltage regulator that can be used instead ... possible to add an additional voltage regulator in case one fails (have ... -
Faulty 128 toastrackHello, I hope someone of the hardware gurus can point me in the right direction for fault finding. My speccy crashes often (sometimes after a short,…
... before (apart from changing keymat, voltage regulator, applying the video fix or ... -
What's this hardware?[URL="http://www2.snapfish.com/slideshow/AlbumID=1351742020/PictureID=39192676020/a=1759991020_1759991020/otsc=SHR/otsi=SPIClink/COBRAND_NAME=snapfis…
... a 7805 and a 7812 voltage regulator, so the power will be ... electronic capacitor for smoothing the voltage, nothing special.
Part ... -
Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…
ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…
... the same problem.
Voltage regulator and ULA both get very ...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…
... though it might be the voltage regulator at first but all the ...Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... , the heat sink on the voltage regulator gets quite warm after only ... . Numbering the pins on the voltage regulator 1,2,3 (from left ...Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... .
I found its voltage regulator not to be working so ... .
With a new regulator I can now measure +5V ...The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…
... a better power supply, separate voltage regulator, two Microdrives, IF-1 and ...Repairing a Disciple disk interface - info for othersJust posted this [URL="www.benophetinternet.nl/hobby"]on my weblog[/URL], but I think it's also interesting to put here. This week I did some work o…
... fine, except for the 7805 voltage regulator on the Disciple, which is ...7805 on PlusD needed?I am planning a batch of PlusD interfaces. As I do not have a board design file (for e.g. Eagle), I am redesiging the PlusD schematic in Eagle myself…
... I was wondering: is the voltage regulator (7805) on the PlusD really ...Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
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I have replaced the Voltage Regulator and the Spectrum now "boots ...The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…
... . I had already replaced the voltage regulator back when the machine was ... was soldered in, and the voltage levels tested. All lines were ...ZX Spectrum problemsHello Everybody, I am new here, and I need some help in my ZX repairs : - I have a ZX Spectrum 48k board (issue 2) which power up but remains stuck o…
... IC6 all are ok, and voltage regulator ok,
but I don ... present on the main 5V regulator.
Please if anyone ...Issue 2 video problemHello all, Need some help with an issue 2 board that I 'm trying to restore. I've replaced all the electrolytic capacitors, changed the voltage regu…
... the electrolytic capacitors, changed the voltage regulator, tr4, and a Zener and ...PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…
... I added the 3.3V voltage regulator, wired the chip to a ...A few mods I've done over the years to my Spec 128k+Hello, Was a bit bored and decided to upload a few pics and sound files from my Spectrum 128k+ I've been tinkering around with over the past several …
... to take the 7805 linear voltage regulator, throw it in the bin ... and get a switching voltage regulator. From the datasheet it's ...
