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+2 fried using the datacorder(Hi, first post here.) I just got hold of an extremely battered and bruised +2 sold to me for spare parts. As usual I plug it in, hook it up to the …
... .uk/itm/2A-POSITIVE-FIXED-VOLTAGE-REGULATOR-L78S05CV-5V-/200793508867?pt=UK_BOI_Electrical_Components_Supplies_ET ... am pretty confident that the regulator is at fault here. -
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 …
... (metal base-plate), circuit safety (voltage regulator) and out-and-out enhancement ... -
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 …
Thanks fog,
Switching voltage regulator is all DC volts...(or rather DC to DC and regulation), so no problem :)
t -
Help needed restoring PCBs from scans/picturesSee below post. [url]http://www.worldofspectrum.org/forums/showpost.php?p=692138&postcount=15[/url] I have all the skills needed for such a task, but…
... palcoder, EPM3032 requiring a seperate voltage regulator, etc. Overall still a solid ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... rail directly from the 7805 voltage regulator. If it's low or ... it to have a negative voltage is very unusual. -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... rail directly from the 7805 voltage regulator. If it's low or ... it to have a negative voltage is very unusual.[/QUOTE]
16 colours on a Timex Sinclair 2068I'm putting a few videos up on YouTube, the first one shows the colours on the TS2068. [url]https://www.youtube.com/watch?v=1tJ1qIMcTUE[/url] Brigh…
... and use a 7805 linear voltage regulator to drop that +7.5V ...Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
Are you sure about the voltage readings? With 5V missing, I ... of your meter to the voltage regulator heatsink (as I did in ... the power on measure the voltage between that and the left ... the 5V output from the regulator. If the 5V is missing ...another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... This means that the output voltage depends both on how much ... very wrong here. 78xxx series voltage regulator chips need two connections in ... or reference so the output voltage will rise to about ... same value as the input voltage! So check all connections between ...ZX Spectrum Microvision - REAL retro setup!Some fun pictures. In reality the picture looks some better and more readible, but the camera doesn't pick it up well. [IMG]http://benophetinternet.…
... TV by using a 7805 voltage regulator.
And using a battery ...Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…
... , open your Spectrum, check the voltage regulator and beyond that.Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... the PSU hits is the voltage regulator (one with the big heatsink ...Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... ]I tried to check the regulator a few days ago using ... will put strain on the voltage regulator pins which can snap them ... the long term for the regulator's heat dissipation. I'm ...Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... is attached to the 7805 voltage regulator. The 7805 heatsink is electrically ... -ws/s1600/7805-pin-gnd-voltage-regulator-5volts-converter.jpg[/IMG]
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…
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... screen from the bottom. The voltage regulator heatsink gets pretty hot, but ...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…
A 7805 voltage regulator has pin out 1,2 ... . You should get a +ve voltage reading. If not, the polarity ...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…
... when the polarity of the voltage is incorrect.
Just ... electrolytic capacitor and the 7805 voltage regulator should have a 100nF multilayer ...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…
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- The middle of the voltage regulator was directly connected to the ... electrolytic capacitor and the 7805 voltage regulator should have a 100nF multilayer ...Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... />
That's where the voltage regulator is. It's normal for ... your power supply's output voltage is a bit higher than ...Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
As Zorn says, the 7805 voltage regulator gets hot as it has ... +10V to +11V dc input voltage from the Sinclair "9V" dc ... do the calculations, the 7805 voltage regulator has to dissipate 4W to ...Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... will produce a higher voltage output than the rating ... cheap transformers the off load voltage can be around 15% ... from the transformer, so the voltage will "sag" somewhat (amount ... the unregulated input voltage goes to a 7805 voltage regulator chip inside ...Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
[U][B]ZX Spectrum Pre-regulator Design[/B][/U]
... one design for a pre-regulator circuit. This is some extra ... dissipated by the 7805 internal voltage regulator and heat sink.
< ... br /> Instead, the pre-regulator circuit helps out with the ...Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... data sheets for the 7805 voltage regulator. They give the drop-out ... voltage as either 2V or 2. ... 5V and the minimum input voltage as either 7V or 7 ... feed this line to a voltage regulator. But I don't think ...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…
... the middle leg of the voltage regulator.
Now I have the ...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…
... hand pin of the 7805 voltage regulator and the centre pin. The ... hand pin of the 7805 voltage regulator and the centre pin.
Barn Find #1Hi, just back from holiday and found a load of spectrum related bits in my folks old barn. They would probably have been a mates who dumped a load of…
... heat-sink where the 7805 voltage regulator fits. This ensures a better ...Transistors 101Hi, Im a complete novice when it comes to electronics and would appreciate any help that can be given. Im replacing the transistor that sits on to…
... +12V (or a very low voltage) to the video section will ... , +9V input, +5V (from 7805 voltage regulator), +12V and -5V generated by ...ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
... amplifier". It compares this voltage to the voltage on the +5V ... regulated supply from the 7805 voltage regulator). If TR8 detects that ... is low, the increased voltage difference between the base and ... that in normal operation the voltage *changes* that TR8 sees ...Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…
... then check the DC voltage on the power socket ... right). And check the voltage regulator which is attached to ... one leg of the regulator to get contact. I ... there for reading the voltage regulator (and in fact every ... other voltage reading you take from ...
