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ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …
... suppose it is a lightweight low voltage power supply . Is there a ... -
ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …
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1) Pin 1 at the PCB end is labelled ... 4
I looked at the info provided on the ... />
3) Pin 3 at Uno end :- Pics says " 3 ... end . What is pin 16 at other end? Info says :-" ... appears to tally with a voltage at the upper end of the ... -
Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
Hi volo,
yes but as there is no negative voltage at the ULA necessary nor allowed DZ1 should be shorted. DZ2 is the only one that is needed.
Greetings Ingo. -
Just had the weirdest power cut ever Oothis morning i was posting Johnny Cash songs on google+, then i took the dog out. Came back noticed the downstairs lamp was flickering so thought it …
High voltage or low voltage? If a phase goes out ... a 240V transformer would give low output and not work properly ... -
Just had the weirdest power cut ever Oothis morning i was posting Johnny Cash songs on google+, then i took the dog out. Came back noticed the downstairs lamp was flickering so thought it …
[quote="guesser;890498"]High voltage or low voltage? If a phase goes out ... a 240V transformer would give low output and not work properly ... -
Just had the weirdest power cut ever Oothis morning i was posting Johnny Cash songs on google+, then i took the dog out. Came back noticed the downstairs lamp was flickering so thought it …
... ;890500"][quote="guesser;890498"]High voltage or low voltage? If a phase goes ... a 240V transformer would give low output and not work properly ... -
New uses for Spectrum 48K - Light Switch ProjectHi All I'd like to use a Spectrum 48K unit as a light switch in my house. It will reside on the wall in my entrance hall and will be used to contr…
... connectors and hook into a low voltage circuit that then triggers a ... -
ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... the reset pin is held low.[/quote]
I had no ... the reset pin is held low, but rather within which cycle ... special, RESET must be low only at the rising edge of clock ... -
ZXBaremulator v3.H(ikoki) BetaHi, Thanks to a Recreated ZX kindly donated by Hikoki, I've added support for it to ZXBaremulator. Now two keyboards can be connected to the PI…
... has a chip to detect low volt tensions. This chip seems ... Recreateds may be oversensitive to low voltage and refuse to be fed ... -
ZXBaremulator v3.H(ikoki) BetaHi, Thanks to a Recreated ZX kindly donated by Hikoki, I've added support for it to ZXBaremulator. Now two keyboards can be connected to the PI…
... answer is accurate about how voltage and amperage works when charging ... .com/questions/29259/charging-devices-voltage-and-amperage
My guess ... Recreated disconnect themselves when detecting low voltage as a protection measure. A ... -
What % of WOSSERS use "old school" tape loading when playing their Speccy games.My guess is .000000001% ( but I might be slightly out on this! ) Do people still enjoy doing it "the old way"?
... is you don't need low voltage aka dying batteries with data ... -
Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…
... off cutting off the existing low voltage power connector if it is ... want to retain the existing low voltage power connector, you can instead ... -
Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…
... have slipped up on the low amps on this one!But ... are a bit on the low side . At least with this one ... -
Gaaaahhhghh! Christmas (Lights)Tis the season to be a grumpy old git. Its now December and as is customary in the USA, after thanks giving the decorations 'must' come out. I've …
... the mains side and the low voltage side may be inadequate or ... , I bought a cheap mains voltage LED set last year. I ... -
can anybody match my high tech testing bay ... [url="https://photos.app.goo.gl/PSsCJRDDCDVJV9158"]https://photos.app.goo.gl/PSsCJRDDCDVJV9158[/url]
... wrong polarity on a high voltage supply...!
[b][i ... take a random guess a low voltage one would just be cooked ... -
Windows 11 - It's commingJust when you thought that there was going to be no more new versions of Windows, a recent leak reveals Microsoft are due to announce Windows 11 soon…
Also its not just semiconductors - there is an increasing demand for capacitors (Low-voltage Multi-Layer Ceramic Capacitors to be precise) - as the quantity of them used in smartphones and other devices increases. -
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 ... -
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…
... with Winston's diag board. At a certain moment in time ... then the diag board claims low memory problems and the ZX ... the same problem.
Voltage regulator and ULA both get very ... -
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…
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I found its voltage regulator not to be working so ... a new regulator I can now measure +5V at all ... /> - Hopeful looking RAS signals at all RAM chips (upper and ... signals at all 4116 chips. CAS is at ~5V at all ... with. This seems a bit low to me if
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... the resistance between the regulator's middle terminal and ... . This seems a bit low. It's 3.4K ... while monitoring the power lines at one of the DRAMs. ... applied power again. The voltage readings were the same as ... Spectrum was drawing 240mA at 9V from the PSU.< ...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 ... problem wasn't software related at all but affected the ... the Microdrives on a hardware/low level without having the IF ...
Check out my homepage at: [url]http://www.bartheld.net ...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 ... miracles: nothing new works at the first attempt.
... , 058,102 (making f17 low will make zxrom go high ... OUT 231(making zxrom low will make f17 go high ... 058,102 (making f17 low will make zxrom go high ...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 ...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…
... , there was at least one design for a pre-regulator circuit. This ... dissipated by the 7805 internal voltage regulator and heat sink.
at 21?C/W as that ... bigger heat-sink. One rated at 17.0?C/W or ...Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…
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First off, the LM317T regulator for the 5V was producing ... connected the TV. At which point the voltage plummeted back to 1 ... .
Replace the aerial lead, voltage down to 1.6V. Completely ... picture, but the voltage is still too low for the 9V input ...Microdrive repair - GREAT NEWS!Microdrive repair facts: We know (almost) pure alcohol and cotton swabs are needed a lot to clean the Microdrive head. We know cartridges degrade, so…
... roller, it might seem good at the start but after using ... .
Fortunately they are available at this moment.
at the voltage regulator first.
These have low values (0 ...ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…
... needs to be done at all. Any ideas would ... the circuit one component at a time, checking to ... Measuring the outputs of the voltage converter circuits in both Spectrums ... latter seems a bit too low (i.e. the difference ... line out. While looking at this, I'm also ...bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…
... following:
* observing the 5V voltage -> obviously ok
* ... transverter while using the 5V regulator -> Buzzsasw did run ... problem could be at the input of the switching regulator - on ... checked were ok and had low loss resistance except C41 - ...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…
... of help from some friends at Greenford Computer Club), of ... is a 78S05 5v 2a voltage regulator in the +2, and ... 5v 2a switch mode regulator in order to reduce ... to replace its legacy regulator, or whether to use ... 2450 5v 1a switch mode regulator. Similarly, I also ...
