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Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…
... my RGB box has a 7805 regulating the 12V taken off ... -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... Electronics I have replaced the 7805 and TR4.
Same ... -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... Electronics I have replaced the 7805 and TR4.
Same ... -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... this? I just replaced the 7805 and TR4 last week. -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... this? I just replaced the 7805 and TR4 last week.[/QUOTE ... -
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 ... -
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…
... that is HOT is the 7805 reg which is HOT!!!!!!! I ... -
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…
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…
... generated prior to the 5v regulator. At the moment my main ...ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
... capacitors on them plus the 7805 regulators. Didn't have any ...Toastrack troubleI just received a toastrack off ebay that someone had bizarrely removed the modulator, no matter, ill go through RGB and replace that at some point, …
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Turned out the 5v regulator was sellotaped in place, what ... they were taped to the regulator, very crude but still, I ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... Speccy.
- replace 7805. The voltage and current reading ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
Never had worn out tr4 tr5. I had either working ones or dead ones.
I have come across worn out (but still working) 7805 voltage regulators causing wavy screen or even colors dissapearing.Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
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I'd just leave 7805 in place for now, and ... worn out (but still working) 7805 voltage regulators causing wavy screen ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... the display good, replace the 7805. By now most of them ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... 20V DC. The 5V from regulator reads 5.11, the +12V ...Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …
It's also worth replacing the old capacitors and the regulator in the PSU, just to be on the safe side.Need for low budget Kempston joystick interfaces?I am thinking of designing a lowcost (< ?10) Kempston joystick interface. Small, one (double sided) board, throughput edge. Others need some too?
@Mcleod
Thats a nice, well focused piece of design!
I have to admit, I am a little envious, I wish my prototypes looked half as good too LOL
btw, whats the 3.3v regulator for?Need for low budget Kempston joystick interfaces?I am thinking of designing a lowcost (< ?10) Kempston joystick interface. Small, one (double sided) board, throughput edge. Others need some too?
... /> btw, whats the 3.3v regulator for?[/QUOTE]
Thank ... very much! :) As for the regulator, this CPLD needs 3,3V ... side (where the 3,3V regulator is located) to avoid this ...Opus Discovery issues!All happens at once when things go wrong eh? This time its the dual drive Opus, neither drive will read/write, motor spins, when formatting you can …
... both methods is cheapest: regulator on board or regulator wired separately. Using ...MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…
... IDE adapter, 5 V switch regulator onboard, floppy port with 3 ...Where can I get the +d PCB files?Where can I get the +d PCB files? I mean this one: [url]http://www.worldofspectrum.org/NotThePlusD[/url] Micky
Why did they not use the +5 volts from the Spectrum edge connector? Instead the 9 volt from the Spectrum and a 7805 and some capacitors.
MickyWhere can I get the +d PCB files?Where can I get the +d PCB files? I mean this one: [url]http://www.worldofspectrum.org/NotThePlusD[/url] Micky
... then be delivered by the regulator inside the Spectrum, of which ... at its limits.
A regulator is a cheap part, and ...BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…
... 13.xx V, found at 7805. (The 9 is 'nominal', just ...BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…
... volts coming in through the regulator
I tried D11 ...Problem with ZX Spectrum (B&W stripes)Hello. I bought a ZX Spectrum, and fortunately, it arrived today. Unfortunately, when I connected it to my TV, this appeared... [IMG]http://i.imgur.…
Although I'm not really up on hardware, I'd start with the very simple basics.
Check the voltage regulator is secure to its heatsink (possible overheating issues otherwise) and if there's any socketed chips ensure they are seated properly.what is this crazy modfound a speccy in my loft yesterday,and it seems to have an external heatsink modd i havent the foggiest about speccys heres a few pics [url]http://i…
... some sort of either power regulator or power amplifier that's ...what is this crazy modfound a speccy in my loft yesterday,and it seems to have an external heatsink modd i havent the foggiest about speccys heres a few pics [url]http://i…
... some sort of either power regulator or power amplifier that's ...
