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ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…
... thing is now alive. One 7805 and one ztx650 tr4 and ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... case was hot (by the 7805 reg) and also the power ... -
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 …
... circuit. I first replaced the 7805 and that problem seemed solved ... -
Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…
... wires that go to the 7805.
After swapping them ... -
48K Issue 3, noisy display.Has anyone here experienced and been able to resolve a problem that looks like this: [URL="http://drizzle.zigg.net/ZX/ZX106-display.jpg"]Photogra…
... electrolytic capacitors and a new 7805. Apart from the poor display ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... replaced a faulty TR4 and 7805 (that had become a 7803 ... -
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…
... seemed fine, except for the 7805 voltage regulator on the Disciple ... .
I replaced the 7805, but it still get's ... replacing the cpacitor at the 7805.
Hope that will solve ... -
My Issue 2 spectrum"IT'S ALIVE!!!!!" - Dr Frankenstein I got my issue 2 spectrum up and running, colours and all. I borrowed socketed lower ram from my issue 3 that is…
... , thank you again), and replacement 7805, electrolyte caps and a whole ... -
Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …
... got it working ULA and 7805 were warm (aboput 45 degress ... -
ZX81 back porch fix using LM1881Hello! Has anyone here did the back porch fix for ZX81 using LM1881? I did it this weekend and instead of clear black on white i got black on dark g…
... is over 40C for example. 7805 heat sink cannot be touch ... /> Also, the measured voltage from 7805 is not 5V but 4 ... -
Spectrum+ and dead keyboardI have a Spectrum+ which had no picture just snow on TV. I found instructions, that it might be regulator 7805, so I changed it. Now I saw something …
... , that it might be regulator 7805, so I changed it. Now ... -
Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…
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…
... having to worry about the 7805 overheating. It isn't pretty ...PlusD mini - production startedI'm developing a PlusD clone, with some features stripped to make it very affordable. The real PlusD and German clone have an 7805 regulator, but I …
... and German clone have an 7805 regulator, but I don't ... DivIDE does not use an 7805, I see no reason why ...What is this ZX81 interface?[IMG]http://benophetinternet.nl/hobby/vanmezelf/IMG_6239.JPG[/IMG] [IMG]http://benophetinternet.nl/hobby/vanmezelf/IMG_6238.JPG[/IMG] It came with …
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 …
... chance is to take the 7805 linear voltage regulator, throw it ... exact same pinouts as the 7805's. This is the one ...Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... me) and found that the 7805 regulator didn?t do anything ...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…
... the heat dissipated by the 7805 internal voltage regulator and heat ...Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …
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Various switches, connectors, 7805 regulator etc
Optional ...Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …
...
Various switches, connectors, 7805 regulator etc
Optional ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... missing and so did the 7805.
So I replaced them ...Using VAC PSU in DC deviceHaving fixed the dead Issue 3B, I began to wonder about the PSU that came with it. It was pretty obvious what had killed the poor Spectrum as the PSU…
... , it resulted with a dead 7805, dead TR4 and TR5, probably ...What is this disk interface (and how to use it)?Anybody seen this floppy disk drive interface before? It uses an MB8877A and the rest is 74XX-logic, no GALs/PALs. And an EPROM. [IMG]http://i1373.p…
... actually looks like the cooled 7805 on that PCB does the ...Best version of SE Basic for use in real 48K machineAs title really. :) I did a search but I'm still confused a bit. :( I've seen a few versions, namely 'SE Basic 0.80a' which has the nice 'bar' abov…
... where can I get a 7805 (7905?) direct DC regulator to ...Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…
... a replacement voor the (hot!) 7805 has popped up a couple ...48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... took some voltages around the 7805 regulator and the positive end ...48K misplaced coloursHello to everybody! Slowly recapping a otherwise working Issue 6A 48K. All new caps aroud LM1889, 7805 and DC-DC converter, which improved ripple an…
... . All new caps aroud LM1889, 7805 and DC-DC converter, which ...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…
... the process I resoldered the 7805 pins and the soldering contacts ...PlusDlite v2014.1 - problems with floppy power supplyI received a small batch of boards of the new PlusDlite design, which is similar to the original PlusD, with GAL etc. The main differences with the o…
... note that I removed the 7805 from that clone, and feed ...Cooking toastrack... the dreaded smellI powered up my Spectrum 128 (heatsink model) yesterday only to see what looked like an out-of-tune picture on the television. I'm using a scart adap…
... even warm. I checked the 7805 regulator under power - it wasn ... I have ordered a new 7805 in the hopes that it ...
