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C46 Capacitor MarkingHi all I've just watched this part of this video: [url]http://www.youtube.com/watch?v=TeCVt2T-YSo&t=17m0s[/url] And he says the marking is incorrec…
... TR4 and one of the coil windings. The negative terminal is ... -
C46 Capacitor MarkingHi all I've just watched this part of this video: [url]http://www.youtube.com/watch?v=TeCVt2T-YSo&t=17m0s[/url] And he says the marking is incorrec…
... used into a very small coil to hold the leg and ... -
Disassembled gamesIs there anywhere that has disassembled games to see how they work? Games like Avalon with the scrolling screens and games that scroll large maps lik…
... and various iterations of GTA. Rewind to 1985 and David Jones ... -
48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... /> But be careful: if the coil was damaged, this may be ... -
48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
Also, when it's fixed, bear in mind that 6A's in my experience are quieter than earlier issues - I have one that you would think the coil is bust as there's no noise even with the case off, but all voltages are there and it works fine :)
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48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…
... fried due to the broken coil. Use a ZTX 650/1 ... -
Early ZX80/81 RAM Pack???Hey all I got given this RAM pack... It doesn't work (i know why now) but compared to my RAM pack this one is really strange... Is this a ZX80 RAM p…
... some questions ab out that coil - does anybody have the ... , seems like a tapped coil with all turns going the ...
If anybody has this coil, I'd like to know ... that is Dreamscape's old coil, looks like one layer ... be possible to modify a coil former used in a ... -
Early ZX80/81 RAM Pack???Hey all I got given this RAM pack... It doesn't work (i know why now) but compared to my RAM pack this one is really strange... Is this a ZX80 RAM p…
Also, is the coil used on early issue Sinclair ... packs the same as the coil used on the later version ... has been said, if the coil is rewound (with new enamelled ... .
Also if the coil and/or the transistors are ... -
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…
... on your video, the power coil tests passed mirroring the results ... -
'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…
... didn't bother testing the coil pins since there isn't ... -
Disassembled gamesIs there anywhere that has disassembled games to see how they work? Games like Avalon with the scrolling screens and games that scroll large maps lik…
... and various iterations of GTA. Rewind to 1985 and David Jones ... -
'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…
Don't forget a new coil, can be got from [URL="http://www.dataserve-retro.co.uk/contents/en-uk/d7.html"]here[/URL].
B -
'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…
... circuit (TR4, TR5 and the coil).
What I would do ... -
48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... and connect a 220 uH coil between R62 and board. (improves ... -
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…
... have no buzz from the coil (sick Spectrums with bad voltage ... they don't make the coil resonate - a Spectrum should have ... joy:
3) Change the Coil and Tr4/Tr5 again.
48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... try is Tuukka's 220uH coil mod to filter the LM1889 ...Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
LM1889N chip draws how much current?
A 220uH coil rated for 130mA can be used?Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
[QUOTE=Renegade;790358]LM1889N chip draws how much current?[/QUOTE]
Typically 35mA, max 45mA
[QUOTE=Renegade;790358]A 220uH coil rated for 130mA can be used?[/QUOTE]I don't see why not.
[B][I]Mark[/I][/B]Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…
Datasheet says 35 mA typical, so yes, a 130 mA coil will be fine.
If your coil has a dc resistance over 5 ohms, it might be good to reduce R62 accordingly so that the lm1889 supply voltage does not drop too much.
Tuukka48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... try is Tuukka's 220uH coil mod to filter the LM1889 ... possible that the 220 uH coil can substitute entirely R62 instead ...48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
[QUOTE=Falco-F8L;790375]As a matter of fact, it is highly possible that the 220 uH coil can substitute entirely R62 instead of being in series with it.[/QUOTE]
That's very true! Hoping to see the results!
TuukkaFaulty 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…
... have no buzz from the coil (sick Spectrums with bad voltage ... they don't make the coil resonate - a Spectrum should have ... joy:
3) Change the Coil and Tr4/Tr5 again.
'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…
TR4, TR5, a coil, a power socket, an sr10s05 regulator and some capacitors ordered... exciting! :D48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... possible that the 220 uH coil can substitute entirely R62 ... R15 with a 220 uH coil. Now I measure 35 ... series with the 220 uH coil. Measurement on C45 goes ... then, that the 220 uH coil does not much.
< ... .
2) The coil dos not lower ripple. Will ...48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... kHz from the TR4/TR5/coil switching circuit
[*]Various frequencies ... outputs from the TR4/TR5/coil switching circuit would also help ...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_…
... new board has a quieter coil and also hasa proper Zilog ...48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
For me, the added coil did reduce ripple at LM1889 ...'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…
... I install the transistors and coil? There don't appear to ...'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…
... be sure.
The coil can only be installed one ...
