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7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…
... am hoping to replace the 7805 regulator in my issue 3 48K ... to a supplier for a 7805 that requires no heatsink, but ... -
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…
... caps as well as the 7805 regulator and some times the ztx650 ... ZX machines used the same 7805 voltage regulator but totally by accident ... uses an 78S05 regulator which is a 2A regulator. That got ... service guide...
"78S05 2A regulator can be used, but hardly ... -
7805 RegulatorGonna order some spares off CPC and I need a regulator for a 48k 3b. Any quick advice on which one of these is best ? [URL="http://cpc.farnell.com/…
... CPC and I need a regulator for a 48k 3b.
7805+regulator&Ntx=mode+matchallpartial& ... &Ntk=gensearch&Ntt=7805+regulator&Ntx=mode+matchallpartial& ... -
RECOM pin compatible DC-DC 7805 regulator replacementsFinally got myself sorted out now. If you want to purchase chips send me an email to [email]alistair@alistairsserver.no-ip.org[/email] with your payp…
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I've replaced the regulator in my spectrum+ with one ... -
7805 Regulator to RECOM modI really need to get shot of some of the 7805 regulators in some of my Spectrums. Latent heat is affecting keyboard membranes etc. As I am not a ha…
... shot of some of the 7805 regulators in some of my ... " the same way as the 7805 does
[*]Do I require ... -
TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... it looks just like the 7805 regulator (it has a metal back ... -
Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... to overheat and shatter. The 7805 regulator also blew up causing quite ... -
Repair options for my own dear old Spectrum 48k?Hello all, This is my first post to this wonderful forum, which is part of a truly great website! My name is Arnold, and I live in Utrecht, The Nethe…
... details: I have measured the 7805 regulator, its upper pin is 4 ... -
Two Odd Spectrum 128K FaultsI also have 2 Spectrum+128 machines with heatsinks. 1. Did not power up properly - I replaced the 7805 regulator and cleaned the edge connector and …
... up properly - I replaced the 7805 regulator and cleaned the edge connector ... -
Upgrading the Humble Spectrum 128 +2 (Grey)Hello there my fellow WoS'ers I am at a subtle in-pass in my wants for one of my +2 motherboards. I received this mobo, DOA in a job lot from fleab…
... had gotten into it) and 7805 regulator was as dead as a ... -
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 think ... DivIDE does not use an 7805, I see no reason why ... -
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, so ... -
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 …
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 …
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 of ...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't ... I have ordered a new 7805 in the hopes that it ...48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... I have fitted a new 7805 regulator, socketed lower and upper RAM ... way off. If the voltage regulator, capacitors, and TR4 and TR5 ...blew up my 128i did it - damn. i accidentally reverted the polarity of the power power supply, so ended up with a blown 5v stabilizer, which i replaced, but there …
... the regulated 5V, and the 7805 regulator got blown first - i thought ...ObituaryYesterday my spectrum died :( Over 7 years of faithful service its finally gone to Silicon heaven. Rest in peace spectrum 48k+ Born sometime in 198…
... be down - there is a 7805 regulator in there which converts the ...Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... power supply failure or the 7805 regulator has gone kaplowie or something ...How do you get an external tape recorder to work on a +2a?Just for the hell of it, just say the internal cassette player stopped working. What command would you use when hooking up an external player, so the…
... just need to use a 7805 regulator. With one of these, it ...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…
... of Spectrums in 80-es. 7805 regulator failure was very very rare ...+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... and you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ...+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... and you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ...TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... that runs entirely off the 7805 regulator. All the other digital parts ... single 5v supply off the 7805 too. (I've not looked ...TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
[QUOTE=gtsamour;187043]
A final question, for voltage regulator (7805) i used one with the indication "L7805CV", is it appropriate?[/QUOTE]
Yes, it this an 7805 regulator from "ST Microelectronics". :-)Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …
... (1N4007) from a 7805 regulator ground pin down to ... code] +-----+
| O |
+-----+
| 7805|
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... cap at the regulator's output pin to ...ZX81 power supplyFriend gives me ZX81 without power supply and i want to test whether he work or not. Can i use Spectrum p.supply for that purposes? I dont want to d…
... , as the ZX81 has a 7805 regulator to bring the input down ...I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... vastly more efficient than a 7805 regulator, and will generate very little ... sink). Having said that, the 7805 is very robust, and provides ... rushing to replace it. The 7805 has built in thermal and ...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 …
... 9V anyway.
The 7805 regulator needs at least 7V to ...
