-
ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... =gtsamour;200536]Its easier to replace it with a new one ... /> No need to replace it ! Simply disconnect 7805 output pin (the one ... -
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... the 3rd pin in the 7805 chip is´t the same ... am spelling this correctly) to replace the original pin. Could that ... -
I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... like a CPLD that can replace it. I think the ... vastly more efficient than a 7805 regulator, and will generate ... Having said that, the 7805 is very robust, and ... be rushing to replace it. The 7805 has built in ... little glue logic) to replace the DRAM. This would ... -
Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... be a problem with the 7805 regulator that?s supposed to ... . It is pushed through the 7805 regulator which provides a stable ... )) or try to desolder and replace the chip yourself (assuming it ... -
True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…
... be a combination of the 7805 + your reg, or all in ... Cookie is intending to replace the 7805 with a switch mode regulator ... -
True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…
... be a combination of the 7805 + your reg, or all in ... the heat output of the 7805. When running off the 9v ... Cookie is intending to replace the 7805 with a switch mode regulator ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... /> I hardly ever had to replace tr5 - it was always tr4 ... smoke went out of the 7805. I replaced it, then I ... -
+2 grey PSU capacitor changeHi I opened up a +2 grey power supply (2.1A max output) unit in order to replace the aged electrolytic capacitor inside, just like I always do with …
... cap is used) and the 7805 can handle up to a ... capacitor (its squezed too) or replace it with a fresh and ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... the 7805 regulator then all he has to do is replace it ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... mode regulators designed to replace things like the 7805) which are vastly ... % efficiency out of a loaded 7805, they can be pushing something ... just dropping in a new 7805 though.
National ... a good replacement for the 7805 if you're drawing current ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... .[/QUOTE]
So replace my ZX Powerpack with a ... then I would try to replace the ULA.
7805 regulator then all he has to do is replace ... regulators designed to replace things like the 7805) which are ... out of a loaded 7805, they can be pushing ... -
Issue 2 Spectrum overheating keyboard membraneI think I have an issue 2 ZX Spectrum. I don't want to take it apart again as I had problems replacing the keyboard membrane. With Interface 1 conne…
... the later issues). Replacing the 7805 regulator with a more modern ... run the input to the 7805 regulator through a (suitably rated ... . I've never attempted to replace the lower 16K (although I ... -
Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…
... , just the 7805 regulator. It's cheap and easy to replace.
Replace the 7805, then we can go ... -
Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…
... , just the 7805 regulator. It's cheap and easy to replace.
Replace the 7805, then we can go ... -
Burnt Out My 48K. HELP!I have a number of spectrums I powered one up wrong today and killed it. I had a power supply that a while ago I rigged up to work with both the ZX8…
... , just the 7805 regulator. It's cheap and easy to replace.
Replace the 7805, then we can go ... maplins and they had one 7805 regulator left. It only had ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... picture i'd replace the TR3, TR4 and 7805 transistor (the big ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... picture i'd replace the TR3, TR4 and 7805 transistor (the big ... beside 7805.
Tommorow i will try to get and replace TR3 ... , TR4 and 7805.
Should i ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... it wouldn't hurt to replace the 7805, but first try giving ... heatsink! Btw. what does the 7805 get as input voltage? (and ... -
My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …
... /> This is not a 'new 7805', but something completely different that ... . There's many ways to replace a 7805 with a switching regulator ... much more expensive than a 7805.
While elegant & ... example, it's known that 7805 regulators are [I]very[/I ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... with those 3 ICs which replace the lower RAM?[/QUOTE]
7805) is then required to drop ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... section (shown next to the 7805 section in schematic), except output ... is input filter for the 7805, you don't want to ... touching any decoupling capacitors: better replace 22nF with ~100nF ceramic, and ... -
DivIDE and joystick interfaceWhich joystick interface works with the DivIDE and ZX 48K? I have TurboRAM but it works not correct or blocks DivIDE. Multiface One works with the j…
... in the right direction to replace the 7805 regulator in a issue ... -
7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…
... replacing a duff part, replace with another 7805. They are cheap, ...
If you want to replace it for other reasons, perhaps ... quite a simple. The 7805 is what's known ... solder in where the 7805 used to be, they ... be connected to where the 7805 used to be.
... -
7805 Regulator HelpI am hoping to replace the 7805 regulator in my issue 3 48K Spectrum soon. Unfortunately I don't know exactly what to buy to replace it with (my fat…
... replacing a duff part, replace with another 7805. They are cheap, ...
If you want to replace it for other reasons, perhaps ... quite a simple. The 7805 is what's known ... solder in where the 7805 used to be, they ... be connected to where the 7805 used to be.
... -
Who can repair a 48K Spectrum?My Spectrum is broken, please see: [url]http://www.worldofspectrum.org/forums/showthread.php?t=29351&highlight=7805+heat+sink&page=2[/url] Does anyb…
... lovely Spectrum + this morning, to replace my broken rubber key 48K ... done a rplacement on the 7805 on the rubber key one ... -
Maximum number of Spectrum devicesHi! What is maximum number of devices i can connect to my rubber key Spectrum? Is there somekind of limit? Now i have Interface 1, Microdrive, Zx p…
... .[/QUOTE]
The internal 7805 regulator offers only 1 Ampere ... for example has its own 7805, so it does not use ... .
You can still replace the 7805 with a 3 Ampere or ... -
Help with broken QLHi, I picked up a QL recently but find that after a while the keyboard stops responding. Any ideas what could be wrong? Thanks
... that you need to just replace the 7805 regulator where the power ... around the heatsink - is the 7805 screwed into the heatsink properly ... -
Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... take Miguel's advice, and replace it when you can. If ... btw!), which Spectrum's internal 7805 regulator will deal with. No ... Spectrum you can't easily replace - read: can't easily find ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... that uses it.
[*] Replace Z80 with faster version + some ... turbo circuit?
[*] Replace ROM with a Flash EPROM ... or ZXMMC+.
[*] Replace keyboard foil with new one ... broken than not).
[*] Replace 7805 with efficient switching regulator & ... -
Question about 7805 regulatorOne of my common practices when I service a ZX machine, is to replace the electrolytic caps as well as the 7805 regulator and some times the ztx650 t…
... regulator in there, I'd replace with at least 2A regulator ... pictures, there's a regular 7805 (1A). Here it is [URL ... my QLs only different brand 7805 (MC: Microcirquit)
The ...
