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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 …
... of luck I could be switching it all on this time ... for the "flying cables" the regulator . Then there is the question ... -
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 …
... work I did on the regulator . it should be shorting out ... all , I think that this Toastrack 128k Spectrum will work well ... -
Modern PSU: picture improvement?I've recently seen advertised some 'replacement power supplies' for Spectrums for which the claim is made that they may make an improvement in pictur…
... heat.
2) Replace +5V regulator with a low drop version ... ?
3) Replace +5V regulator with a switching replacement (see Recom, Tracopower ... course you need a psu + regulator that can handle the current ... -
Modern PSU: picture improvement?I've recently seen advertised some 'replacement power supplies' for Spectrums for which the claim is made that they may make an improvement in pictur…
... Spectrum 16k / 48k / plus / 128k+ (toastrack) and the Amstrad +2 (grey ... , yes the 7805 series voltage regulator will dissipate less power as ... -
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 …
... the disk drives, it's regulator ICs will run cooler. It ... to supply a Spectrum 128K (toastrack).
[b][i]Mark ... -
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 …
... to get a Spectrum Toastrack 128k with a DK ... this is secured the ToastRack 128K can be offered up ... M3 bolt and the Toastrack is locked with a ... ?
2) The Toastrack 128k . My Toatrack has a ... PCB to the adapted heatsink/regulator appear to have a ... -
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 …
The Opus regulator that is connected to the ... get hot. But in the 'switching' power supplies
regulation is ... done by changing the switching process. So much less power ... your powersupply is a linear regulator, but I would be
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 …
... to think about the "Flying Regulator" solution. Could it be ... regulator? I was intrigued as I had not come across these switching ... only would get the "flying regulator" treatment . I decided that ... PCBs and used in "flying regulator" mode with good plastic ...Speccy 128k Toastrack capacitorsDoes anyone have a list of all the electrolytic capacitor values in a speccy 128k toastrack they could post...I've looked around and see plenty for …
... used in a Sinclair 128k (toastrack) machine:
[code]ID Value ... /> C34 22uF 25V Axial +5V (regulator)
C44 100uF 25V Axial ...what are the differences between the 48K spectrum and the spectrum+ ?^^^^^ see above ^^^^^
... " is probably the 7805 5V regulator and if it blew up ... 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/Speccy 128k Toastrack capacitorsDoes anyone have a list of all the electrolytic capacitor values in a speccy 128k toastrack they could post...I've looked around and see plenty for …
... used in a Sinclair 128k (toastrack) machine:
[code]ID Value ... /> C34 22uF 25V Axial +5V (regulator)
C44 100uF 25V Axial ...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 …
... testing . Most precarious is a Toastrack 128k. These days one would ... not use and abuse a Toastrack 128k in this way but ... keyboard and I know the regulator on this looked dodgy last ...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 …
... (forgetting the insulators on the regulator) . But at the time ... heatsink included the original Toastrack heatsink (sawn off a ... ruler like" strip . The regulator is now on the end ... regulator are accessible.
So have I have a working Toastrack ...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!!!!!…
... over. Besides fitting a new regulator [the original fault], many other ... it to give proper RGB switching signal - gives a more stable ... them crashing], - Fitted a new regulator (that was the actual fault ...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 ... -linear operation) with a suitable switching type (e.g. A Recom ...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…
... RGB switching problems for all TVs)! ...Except for my 3rd my toastrack ... happens, I connected my problematic toastrack with a simple composite cable ... aerial (RF) connection my 3rd toastrack although don't have flickering ...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 ... -linear operation) with a suitable switching type (e.g. A Recom ...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 ... -linear operation) with a suitable switching type (e.g. A Recom ... more to a DC/DC switching converter than putting a control ...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 …
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Testing this 128k Toastrack
I have said it ... insulator washer on the regulator as that was just ...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 …
... . The second was a 128K Toastrack similar to this one , the ... third one ,which is another Toastrack but this time with a ... normal . This could be a regulator problem but it is interesting ...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 …
... the extra mile" with the regulator
It is always ... a proper job on the regulator by putting an insulator in ... used was really one for switching regulators (I had removed these ... of plastic to stop the regulator swivelling out of position so ...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 ... insulator (probably more appropriate for switching regulators so detail matters!) .But ... use of the the wrong regulator insulator ! , the dremelling out ...Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... 7805 voltage regulator was changed to a MuRata switching 5V regulator, once again ...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 …
... OK with the new style switching regulators . As I have got ... and retain the old style regulator .
It is clear ...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 ... no video if the internal switching power supply dies.
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 underlying display problem was "regulator inspired" . Another strange ... . So the " old regulator" fixes become useful again but ... for using the relatively new switching regulators . I suppose ... have decided to "embrace" switching regulators . I have been ...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 …
... are many choices for these switching 7805 drop-ins. And ... ://uk.farnell.com/linear-regulator-converters-drop-in-replacements- ... dc-dc"]Linear Regulator Converters - Drop In Replacements - ... .. plus postage for one regulator is a bit steep ?[/quote ...ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…
... /> So new switching regulators come in replacing the old regulator . Demand for ...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…
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So fit a 5V regulator. Next check that you have ... check the operation of the switching circuitry, as the 4116 DRAM ...
