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Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... caps (changed those) and the voltage regulator (which I also changed). Could ... -
Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... the tab of the 7805 voltage regulator (where the heatsink attaches), use ... lead of each resistor. The voltage on the other end will ... -
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…
... found is that the disciple voltage regulator heats like a pentium, and ... 't realise it was the voltage regulator, though, but I guess it ... =45721]replacing the Spectrum's voltage regulator[/THREAD] makes quite a lot ... -
eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …
... impact is on the input voltage to the BLANKING pin, which ... 2.5V solution by a voltage divider with the 560 and ... want to be bringing the voltage down to the proper level ... />
I think using a voltage regulator should overcome any issues between ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
I'll check the voltage level while leaving it running ... power supply, or replacing the voltage regulator (could it be dropping the ... voltage as it heats up?) or ... component on the board causing voltage drop?
Any links ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... checked the 5v from the voltage regulator and it doesn't drop ... components getting hot are the voltage regulator and the ULA. -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... checked the 5v from the voltage regulator and it doesn't drop ... components getting hot are the voltage regulator and the ULA.[/QUOTE]
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... to when cold. The voltage drop across a diode reduces ... biggest sources are the 7805 voltage regulator followed by the ULA. Other ... better PSU or a pre-regulator circuit. Or a simpler ... the heatsink from the 7805 voltage regulator. Clean off any old heatsink ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... three legs is probably the voltage regulator, that will get very hot ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... describing is a 3.3V voltage regulator. It reduces the +5V supply ... /plus/128k+ machines the 7805 voltage regulator works so hard, it has ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
i understand that a voltage regulator will get hot when working ...Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... suppose to have its own voltage regulator circuits (meaning use another 7805 ...Help me fix my grail ZX 128k SpectrumHi all, Ok today my grail toaster rack ZX spectrum 128k turned up. I finally found one and for a reasonable price. I powered it up and..... Nothing …
... safe to call this a regulator failure so :)
... /p/ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31j"]here's ... between the heatsink and the regulator when you're fitting the ... replace the connector to the regulator the right way round when ...ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... pin 1 of the 7805 voltage regulator to test if the "+9V ... metal tab of the 7805 voltage regulator as shown by the "0V ...48k PSU Alternatives & DivIDE v DivMMCHey folks, The 48k Speccy I got rather recently is missing it's power supply (though, I know it's working from testing it with the power supply from…
... no protection against reverse voltage and the voltage regulator will just pop if ...ZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... , but apart from the 7805 voltage regulator (that provides the +5V), it ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... gives a higher-than-nominal voltage when unloaded (root
... 100Hz ripple on it. The voltage regulator
inside the Spectrum ... /> Does this mean that the voltage regulator has another purpose, besides bringing ... instead of a 'true' voltage regulator?Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... ripple on it. The voltage regulator
inside the ... Does this mean that the voltage regulator has another purpose, besides ... instead of a 'true' voltage regulator?[/QUOTE]
Both the ... to a voltage regulator circuit. The purpose of a voltage regulator is ...Spectrum & ZX81 PSU Strange VoltagesHi all I've just refurbished my ZX spectrum PSU after i accidently broke one of the wires i soldered the joints to the PCB nicely and all seems to b…
... , which means that the actual voltage supplied depends on the load ... to kill the Speccy's voltage conversion circuitry.
Personally ... be dissipated by the 7805 voltage regulator on the ZX81/Spectrum board ...Painting 128+ heatsinkI've searched for this and not come up with anything. Just bought a rather cheap 128+ off eBay which is apparently working (although I haven't teste…
... . So I'd do the voltage regulator mod and put a heatsink ...Painting 128+ heatsinkI've searched for this and not come up with anything. Just bought a rather cheap 128+ off eBay which is apparently working (although I haven't teste…
... heat generated by the 7805 voltage regulator to the air. Heat takes ... the temperature of the 7805 voltage regulator from increasing above the recommended ... you change the existing 7805 voltage regulator for a modern switching type ...Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…
... to swap out the 7805 voltage regulator for a switching type so ...Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…
... in response to the test voltage at the probes.
voltage regulator.
Then connect the positive ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... buy a 7905 or 79L05 voltage regulator. This will convert the -12V ... the middle hole for the voltage regulator chip, or the mounting/bolt ... the board for where the voltage regulator and heatsink attached are all ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... of the board?
Voltage Regulator 150+
Measured on ...Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... coil (sick Spectrums with bad voltage are often silent as they ... ?
Would you change the voltage regulator also?Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…
... you change the voltage regulator also?[/QUOTE]
The regulator is easy to ... it out for a switching regulator, which will run cool and ... the short term. A switching regulator costs a fair whack. Maybe ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
All voltage testing should be done with ... is produced by the 7805 voltage regulator, which should work regardless of ... ) or well outside the required voltage range. The +12V supply will ... the PSU used, the mains voltage and the actual wiring on ...Burned finger temp on rubber 48k heatsink normal?Ok so i opened it up because a few keys started to act up and i noticed that after burning my hand the heatsink was that hot i could actually smell t…
... "bricks", however I put the voltage regulator on the outside with a ...Modern PSUHello everyone, I'm looking for a modern PSU for my Spectrums and my dual set of 3.5'' floppy drive+HxC floppy emulator. The one for Spectrum should …
... a linear voltage regulator) to maintain a stable voltage up to its ... a higher voltage to work, so a 9V regulator usually ... huge heatsink attached to the regulator inside.
... more efficiently than a linear voltage regulator. Rather than burning the ...
