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Black screen on 48k+Hello peeps Just bought a 48k+ was working fine then after leaving it off over night I turned back on to get a total black screen, no border etc. …
... attached to the 7805 voltage regulator or to the case of ... depends on the load current (power used by the item it ... -
Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…
http://www.digikey.com/product-detail/en/murata-power-solutions-inc/OKI-78SR-5-1.5-W36H-C/811-2692-ND/3438675
This is a regulator that I use for layout pcb, about $4.00 -
what are the differences between the 48K spectrum and the spectrum+ ?^^^^^ see above ^^^^^
... " is probably the 7805 5V regulator and if it blew up ... /> Probably lower RAM and the power supply switching transistors. -
Heat-sinking the spectrum 48+ :| [URL=http://s1063.photobucket.com/user/JRT480/media/Fotografia1988_zps5egnygdp.jpg.html][IMG]http://i1063.photobucket.com/albums/t515/JRT480/…
Well explained as ever Mark.( I forgot about the caps!)
This is the regulator I use in my ZX81's and speccies...
http://uk.rs-online.com/web/c/power-supplies-transformers/dc-dc-converters/switching-regulators/ -
ZX 128+ RGB Scart - ghosting,patterns,flickeringHi all, I have a ZX Spectrum 128+ with RGB Scart (from TheSinclairShop bought ages ago) hooked on a 40' Samsung Smart TV. Awful ghosting, silly p…
... a power supply arrangement is better.
A LM317T voltage regulator ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... available at the time . The Power Supply Transformer although quite small ... makes any difference to its power capacity I do not know ... and there is no "flying regulator". However though the EPROM is ... -
ZX Spectrum 48k output yellow and jumpyI have a ZX Spectrum that I modded for composite output a few years a go. Lately they output started to be a bit jumpy during the first half hour. Th…
... and taking away the voltage regulator (7805) and installing instead a ... check all voltages on all power supply lines. -
Are there any differencies between Speccies in different countries?I am asking for differencies of ordinary Speccies, not clones. Can I travel to foreign country, buy Speccy from fleamarket and except it will run at …
... 2 (gray) will drain more power than standard 128k and 48k ... it will be enough to power any Spectrum. Note that ... the Spectrum has a voltage regulator inside, so it should ... +3 use a different power supply, with a DIN6 ... connect it to a PC power supply (but that's ... -
Powering the Halequin 128....Hi all, I've just ordered a Harlequin 128, and have been looking at the documentation. Looking at the way it is designed, it looks like it's de…
... /> principally it is possible to power the Harlequin from a stable ... at the connector. Using a regulator on the board guaranties stable ... the board. Using a switching regulator with a high efficience has ... -
Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
... replace the 7805 series voltage regulator (I dislike the term linear ... ]http://uk.farnell.com/recom-power/r-785-0-1-0 ... /1793143[/url]
Traco Power TSR 1-2450
[url ... -
How many interfaces can be paired up together (as a combo) on the Speccy's back edge connector?Well some would say none as it puts too much of a power strain on the Speccy's power supply . So ignoring this aspect the same question can be asked …
The +5V voltage regulator (7805) inside the Speccy is ... go for anything what is power hungry more than 400-500mA ... -
How many interfaces can be paired up together (as a combo) on the Speccy's back edge connector?Well some would say none as it puts too much of a power strain on the Speccy's power supply . So ignoring this aspect the same question can be asked …
... ;897442"]The +5V voltage regulator (7805) inside the Speccy ... for anything what is power hungry more than 400 ... Most power hungry interfaces and expansions have their own +5V regulator, so ... actually use current from the '+9V' rail. Most non-power ... -
Running a Spectrum from a battery...?Here's a bizarre idea that crossed my mind the other day: is it possible to run a Spectrum from a 12V battery? You see, I've got this strange idea…
... you replace the 7805 voltage regulator with a good switching type ... Spectrums that have had the power supply upgrade modification (issue 3B ... known to had the "mandatory" power supply upgrade modification, it's ... not wise to power these with any input voltage ... -
Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …
... an insulator washer on the regulator as that was just the ... .
I decided to power it up minus the keyboard ... should check the the wearsaver power lead has negative polarity. -
Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …
... extra mile" with the regulator
It ... proper job on the regulator by putting an insulator ... these from an old power supply and thought they ... bolt that bolts down the regulator
4) I ... plastic to stop the regulator swivelling out of position ... -
Dk'tronics and other similar "add on" Speccy keyboards . What can be done with them and when?. The underlying assumption I am making here is that people who have them will want to "hang on" to them and may also want to get them working . But …
More on the regulator.
I found a ... better spot for the regulator on the heat sink with ... use of the the wrong regulator insulator ! , the dremelling out and ... the case like the female power supply plug in port on ... -
128K + Toast Rack getting quite hot?Just wondering something if someone can put my mind at ease After using my 128k for around 10 minutes+ it seems to get quite warm around the heatsin…
... by getting rid of unwanted power in the form of heat ... take the heat from the regulator and spreading it over a ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... and the heat from the regulator and the circuitry, everything inside ... /> Due to the internal switching power supply that generates the -5V ... video if the internal switching power supply dies.
So ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... a mica insulator on the regulator , the way the insulation ... the underlying display problem was "regulator inspired" . Another strange thing ... away . So the " old regulator" fixes become useful again but ... you can get a Chinese power supply with one of these ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
Switching mode power supplies for the ZX Spectrum. < ... a TSR 1-2450 switching regulator :-
[url="http:// ... /2014/11/zx-spectrum-voltage-regulator.html"]blog.tynemouthsoftware.co.uk ... /2014/11/zx-spectrum-voltage-regulator.html[/url]
... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... http://uk.farnell.com/linear-regulator-converters-drop-in-replacements- ... dc-dc"]Linear Regulator Converters - Drop In Replacements - ... you can get a Chinese power supply with one of ... 5.. plus postage for one regulator is a bit steep ?[/quote ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... guv"!) after fitting a switching regulator to a 48k Spectrum
regulator on a bit of metal in a power supply ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... Chinese switching regulator on a bit of metal in a power supply ... not a regulator, that's a power transistor (often a power MOSFET) that ... higher. For same amount of power, high voltage = low current. ... switch whether more or less power is needed.
... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... the lines of : Tracopower Switching Regulator 6.5-36vdc ,Input 5v ... ] you have power transistors, MOSFETs, voltage regulators, power diodes, triacs, power resistors, etc ... -
Frying a 48K ZX Spectrum (revision 4A) with 10 V instead of 5 VHello I got a used zx spectrum. When I opened it up, there was no 5 V positive voltage regulator at the 10 V power inlet. Instead what would be in…
... the power supply circuitry.
So fit a 5V regulator. Next ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... />
[url="http://power.murata.com/en/oki-78sr ... -w36-c-1.html"]power.murata.com/en/oki ... regulators . Even switch mode power supplies are mentioned . But ... /3x-Switch-Mode-5v-Regulator-replaces-7805-for-ZX- ... /3x-Switch-Mode-5v-Regulator-replaces-7805-for-ZX ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... /2014/11/zx-spectrum-voltage-regulator.html"]blog.tynemouthsoftware.co.uk ... /2014/11/zx-spectrum-voltage-regulator.html[/url]
power LED.
5) an ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... or Traco Power) in place of the 7805 voltage regulator (so no ... /off switch in it's power lead.
[*]Have at least ... one "power on" LED. Maybe one LED ... for each of the four power rails if space can be ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... or Traco Power) in place of the 7805 voltage regulator (so no ... /off switch in it's power lead.
[*]Have at least ... one "power on" LED. Maybe one LED ... for each of the four power rails if space can be ... -
Clamping Speccy InterfacesThere are a huge number of broken Speccy interfaces available . I came across one on Ebay recently said to be "partly working" or similar .Why are th…
... have been shorting out a power pin. Not sure it would ... or the old existing voltage regulator, you'd still get heat ...
