-
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... and 5V, so isolate the power and get it from the ... good idea and no voltage regulator is needed.
I ... -
+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... in instead of using the regulator because you still need the ... do is isolate the internal power supply circuits entirely and inject ... are still present in the power supply circuitry to get it ... -
+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... slap a 9volt 2am DC regulator to the +12
regulator - nothing major - if you got ... />
A rough estimate of power dissipation would be about 14 ... -
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 …
nice mods, so that mod for the regulator is ok for UK / PAL ? I mean you use some sort of step up / down for the power ?
amiga 600 / 1200's were mainly euro machines.. and things like the pc box machines 4000? etc were more in the US I guess. -
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…
... I have only tested the regulator and that spits out ... 5.[/QUOTE]The 7805 voltage regulator only produces the +5V supply ... transistor based small switch mode power supply.
[QUOTE=deadeye ... attached to the 7805 regulator) as the regulator metal tab is ... -
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…
... the loudspeaker, is that the power supply on the TS2068 is ... 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…
... regulator heatsink (as I did in the video) and with the power ... 9 - 11V input from the power supply. If it's missing ... 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…
... grey +2 is an unregulated power supply. This means that the ... wrong here. 78xxx series voltage regulator chips need two connections in ... -
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…
... but ... did you check the power supply output?
If the ... power brick is OK, open your Spectrum, check the voltage regulator ... -
Is This PSU Useable on the Speccy?I just got my Speccy and the PSU has had some 'work' done to it. Somebody has added an extra length of cable on it but rather than soldering or crim…
... the heat level from the regulator (and heatsink).
For cool ... />
With the original Sinclair power unit, as long as the ... -
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…
... />
[QUOTE=CaptainHayashi;701778]The power supply appears to have been ... around to ordering a +2 power supply for it. Now it ... CaptainHayashi;701778]Since the previous power supply was KO'd that ... 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…
... D
The +2 power brick *seems* to be compatible ... job than the 16/48K power brick I got with ... I tried to check the regulator a few days ago using ... sense to me that the power brick'd be dead, ... and all attempts to measure power flow in the Speccy itself ... -
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…
... attached to the 7805 voltage regulator. The 7805 heatsink is electrically ... voltages.
The main power supply line in the Spectrum ... /s1600/7805-pin-gnd-voltage-regulator-5volts-converter.jpg[/IMG]
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... and maybe even lower in power use.[/QUOTE]
Yeah ... new heatsink compound to the regulator/heatsink junction, reseat all the ...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…
... faults:
1. On power up, everything looks fine. The ... from the bottom. The voltage regulator heatsink gets pretty hot, but ...ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…
... IC23 to 5V when you power on the Spectrum while it ... . The output of the voltage regulator or pin 14 of IC23 ...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 ... means it's fine. OR, power it all up, place a ...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. …
... less efficient and the voltage regulator's heatsink is smaller. If ... 're using an original ZX power supply, using a lower voltage ... the centre pin of the power input connector must be 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. …
... /> That's where the voltage regulator is. It's normal for ... day and perhaps if your power supply's output voltage is ...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. …
... the capacitor in the external power supply and if you use ... measure the voltage of the power supply under load, then you ... 1024MAK is correct that the regulator goes into thermal shutdown and ... the input voltage to the regulator may be to high. There ...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. …
... the voltage of the power supply (as in this ... output voltage of the power supply as the blue ... problem with the Spectrum power supplies is that the Capacitors ... the Cap in the power supply before I even ... removed the internal 7805 regulator and use the same ...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. …
... direction of "simple" unregulated dc power supply theory...
... of this.
The power transfer from primary to secondary ... unregulated / non-regulated dc power supply unit depends on many ... goes to a 7805 voltage regulator chip inside the Spectrum ( ...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. …
... by the 7805 internal voltage regulator and heat sink.
Instead, the pre-regulator circuit helps out with the ... reverse polarity protection and a power on LED. If you wish ... green LED
TR1 .... NPN power transistor, IC max of 1 ...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. …
... bench power supply, I usually use a simple LMsomething based regulator in ... an on/off switch and power on LED. It produces approx ...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. …
... sheets for the 7805 voltage regulator. They give the drop-out ... /> The internal mini switch mode power supply in the Spectrum uses ... this line to a voltage regulator. But I don't think ...Opus Discovery PSU[IMG]http://www.scotek.net/zx spectrum/opus.jpg[/IMG] This is a photo of my Opus Discovery transformer. Can anyone tell me what the connections are …
... that it was a low power transformer and would be unsuitable ... where the rectifiers/diodes and regulator reside, then I think you ...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…
... input, +5V (from 7805 voltage regulator), +12V and -5V generated by ... small on board switch mode power section.
The easiest ...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…
... B]The Spectrum internal inverter power circuit[/B][/U]
power circuit is [URL="http://www ... supply from the 7805 voltage regulator). If TR8 detects that the ... transistor, TR9 to deliver more power to the primary winding of ...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…
... voltage on the power socket (marked Power Plg on ... the PCB, top right). And check the voltage regulator ... one leg of the regulator to get contact. ... ranging), starting with the power plug, touch the ... for reading the voltage regulator (and in fact ...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…
... tab where the 7805 voltage regulator attaches to the black metal ... , or with the 7805 voltage regulator, you could short a pin ... power supply 0V / ground via the tab of the 7805 voltage regulator ...
