-
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…
... 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 ... -
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 ... -
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 …
... , these all have internal voltage regulator circuitry. They are designed ... regulated supply with an output voltage of 8V to 11V. ... heat that the internal 5V regulator has to dissipate, go ... and comes as standard. Over-voltage (also called crowbar protection) ... -
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... /p/ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31[/url]
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... tab of the 7805 regulator is electrically connected to ... /ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31[/URL ... /ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31j"]http ... /ts7805cz-1a-positive-fixed-voltage-regulator-to220-case-ql31j[/URL ...Sinclair ZX Spectrum 128My loving mum has brought me back one of these beauties from a carboot sale but I'm haven a slight problem with it I CAN'T FIND THE ON SWITCH!!!!!…
... (or should be) a 78S05 voltage regulator. The wiring looks ok (red ... is to convert the unregulated voltage (somewhere between 10-12v) from ...Sinclair ZX Spectrum 128My loving mum has brought me back one of these beauties from a carboot sale but I'm haven a slight problem with it I CAN'T FIND THE ON SWITCH!!!!!…
... (or should be) a 78S05 voltage regulator. The wiring looks ok (red ... ]
That's the voltage I'm getting, around 11v ... and I just soldered the regulator to them. That's why ...Spectrum preservation/clean up questions.I’m sorting out my 5 Spectrums trying to make them look a bit better, and to package them up how they should be, and to get them to be reliable…
... that the Z80, Rom, and voltage regulator heatsink are at mild temperature ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... />
With regard to the voltage readings that you have taken ... /metal tab of the 7805 voltage regulator for your meters negative (black ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... />
With regard to the voltage readings that you have taken ... /metal tab of the 7805 voltage regulator for your meters negative (black ... />
If I measure the voltage across the ICs I get ...RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... the problem is in the RAM bank or the buffers/shift ... every memory location, as a RAM failure would suggest.[/QUOTE]
voltage of RAM memory, i don?t ... it the voltages of the RAM.New Raspberry PiThere's a new raspberry Pi coming out, faster quad core processor and 1Gb ram ! [url]http://www.bbc.co.uk/news/technology-31088908[/url]
... : apparently the RPi 2's voltage regulator is sensitive to light, enough ... effect inside a bare-die voltage regulator IC (U16). Reportedly fixed be ...Running a ZX Spectrum Stateside.Ok, so I have some spare time and want to hook my Spectrums up to my Big 60" TV for some fun. My Sony AV unit should be able to translate the signal …
... units. Also, since the mains voltage is rectified to DC, 60Hz ... 9v regardless of load, the voltage regulator inside the machine doesn't ...Just Speccy 128Wow, got home and found that I have received a parcel from Zaxon containing a Just Speccy 128 PCB :-) B-)<br>Now all I need is a parts list, th…
... don't need a high voltage rating, as it's all ... are fine (or a higher voltage as long as it fits ... the data sheet for the voltage regulator chip, LM2596S-5.0 (5V ...
