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Composite conversion problem *update*Ok, So i converted an Old Rubber key to Composite video & i got alot of interference on the screen. Especially when border was red. Loads of scratc…
... ] Several of us replaced the regulator (normally 7805) by a Recom type ... -
BETA-DISC (TR-DOS) support in ZX emulatorsBETADISC 128 is original device designed for external use with ZX Spectrum 128/+2(grey). Russians ZX clones (Pentagon, Scorpion, ZX profi, Quorum, ZX…
... . Betadisk interfaces have own 7805 voltage regulator and some versions needs +12V ... -
Problems with a gray ZX Spectrum +2Hello. First of all, thank you for receiving me on this forum. I'll try to help everybody as well as I can Said that, I want to do two questions abo…
... remove the 7805 in favor of a more efficient regulator, so that ... -
Problems with a gray ZX Spectrum +2Hello. First of all, thank you for receiving me on this forum. I'll try to help everybody as well as I can Said that, I want to do two questions abo…
... remove the 7805 in favor of a more efficient regulator, so that ... forums, may have some decent 7805 replacements for sale at a ... .php?t=35239&highlight=7805"]http://www.worldofspectrum.org/forums ... .php?t=35239&highlight=7805[/URL]
edit to ... -
Greetings all overheat problemsfirstly hello everybody and thanks for adding me to the forum dont know if ill be much use here but i hope so the problem i have or should i say a…
... I would suggest replacing this regulator with a [URL="http:// ... itm/10-x-78S05-5V-Regulator-7805-FREE-POSTAGE-/120765968107?pt= ... other than the basic 7805 (1A) regulator, which wouldn't last ... heat was localized on the regulator - very little was being ... -
RECOM pin compatible DC-DC 7805 regulator replacementsFinally got myself sorted out now. If you want to purchase chips send me an email to [email]alistair@alistairsserver.no-ip.org[/email] with your payp…
... =BloodBaz;562665]
Is this regulator okay for 48K Spectrums with ... to solder as a normal 7805, rather depends on your skill ... and the regulator flat with the board as the 7805 would.
7805 :) -
Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... 7805 output. If not present, isolate the output pin of the regulator ... output pin unconnected, replace the 7805.
- With a correct ... -
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…
I would start by replacing the 7805 voltage regulator. -
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…
... motherboard and the 7508 voltage regulator (the three pin component) when ... you use a linear regulator like the 7805 you DEFINITELY need a ... -
Making a Zx Spectrum betterIs there anyway to make my Grey ZX Spectrum more power efficient and more reliable from the original you get. What I mean is we all know the ZX Spec…
... fresh ones.
Replace 7805 power regulator with the Recom direct (and ... -
Making a Zx Spectrum betterIs there anyway to make my Grey ZX Spectrum more power efficient and more reliable from the original you get. What I mean is we all know the ZX Spec…
... Toast all had the stock 7805 (1amp) regulator
the Amstrad ... -
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…
... indeed been fitted, the regulator is a standard 7805, but, also attached ... about it, without those that regulator could simply go straight back ... -
Internal ROM expansionHas anybody designed a multiple-ROM interface that plugs into the internal ROM socket instead of plugging onto the edge connector? It would be useful…
... in a rubber speccy the regulator 7805 is replaced by a Recom ... -
ZX Spectrum TowerHi all, i am working on a ZX Spectrum 48K build in a PC tower case. Is there anyone who did it before? I have some questions duo the PSU. I have to g…
... -12v/+12v/-5v and a 7805 for the +5v.[/QUOTE]
regulator with a DC/DC converter. I believe the 7805 is ... -
Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... supply, caused by cad capacitors, 7805 malfunction, sudden voltage variations that ... regulated fast enough by the regulator. Besides, the 4116 memory chips ... -
Misbehaving 128K toastrackI acquired a toastrack some time ago off ebay and it worked just nice up until recently. It arrived with no PSU or cables so I paired it with a grey …
Sounds like the 7805 power regulator is malfunctioning after warming up, ... the situation worse.
The 7805 seems to work again after ... would start by replacing the 7805 which is rather easy. If ... -
Misbehaving 128K toastrackI acquired a toastrack some time ago off ebay and it worked just nice up until recently. It arrived with no PSU or cables so I paired it with a grey …
... where to start. Luckily, the 7805 replacement is as easy as ... of replacing the 7805 with a Recom voltage regulator, would 1.5A ... -
Misbehaving 128K toastrackI acquired a toastrack some time ago off ebay and it worked just nice up until recently. It arrived with no PSU or cables so I paired it with a grey …
... of replacing the 7805 with a Recom voltage regulator, would 1.5A ... -
Misbehaving 128K toastrackI acquired a toastrack some time ago off ebay and it worked just nice up until recently. It arrived with no PSU or cables so I paired it with a grey …
... wasn't sure about the regulator because the original external PSU ... heavily loaded, especially since the 7805 is rated at 1A. I ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... /> Remember most switching drop-in 7805 replacements are rated for 1A ... peripherals is [whatever is the regulator's rated [I]output[/I ... of an issue where the 7805 sits in a Spectrum, I ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... of my (28 year) old 7805, warmed up the solder joints ... (and cool to the touch) regulator - Result!.
Thanks for ... -
Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …
... ?)[/QUOTE]
Well. The 7805 was what first blew on ... . Then 4116 went. I replaced 7805 and 4116, and ran it ... 4164s and the 7805 with a suitable switching power regulator. Might then ... -
48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…
[QUOTE=Spirantho;644846]Check the 7805 too. Some of them as ... , looks like something a linear regulator would do indeed... the voltages ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... for the 7805 or substituting it by a switching regulator. Using a ... 1W and more at the 7805 which leads to overheating by ... you used. Therefore a switching regulator could keep the board cool ... -
strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... replaced the 7805 with a 1.5 Amp Recom switching regulator and ... -
ZX Spectrum power supplyHi, I'm looking for a small lightweight power supply that would be a perfect substitute for the original, it's meant for a video patched zx spectrum…
... PSU, but passed through a regulator to give approx. 8V for ... dissipated by the Spectrum's 7805 and so the innards don ... -
ZX Spectrum power supplyHi, I'm looking for a small lightweight power supply that would be a perfect substitute for the original, it's meant for a video patched zx spectrum…
... PSU, but passed through a regulator to give approx. 8V for ... dissipated by the Spectrum's 7805 and so the innards don ... -
12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…
Replace you 7805 with a compatible DCDC like this, [url]http://mikrokopter.altigator.com/recom-dcdc-switching-regulator-r785010-5v1a-p-77.html[/url] (I think there is a 1.5A model available). Then speccy can take 12v directly and make less heat! -
12V -> 9VI found this simple dc-dc converter: [url]http://www.mcrent.com/workbench/dcdc1216/[/url] it converts 12V to 16V, can it be used to produce 9V by mod…
[QUOTE=XorA;655419]Replace you 7805 with a compatible DCDC like ... .altigator.com/recom-dcdc-switching-regulator-r785010-5v1a-p-77.html ... -
PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…
If you've shorted the 5v line to ground at some point, it probably means the 7805 is toast. Even if you've removed the short circuit it won't work if the regulator has burnt out
