-
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... % is great, but whats about 7805, how much yield does it ... that the efficiency of the 7805 transistor is 55% which is ... -
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... stick to the DC-DC regulator plan :)New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... a 78S09 2 amp 9v regulator
hang on.... that ... a 2 amp 9 volt regulator... wouldn't it be easier ... just to buy the 5v regulator instead :DNew speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... that the efficiency of the 7805 transistor is 55% which is ... Plus.
55%? Okay, the 7805 is a very old technology ... to the left pin of 7805 (They are upside-down).RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... hex inverter and a voltage regulator (along with a few passives ...RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... to have its own 5v regulator anyway as the +3 gives ...New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... the same horizontal position as 7805, it is impossible. If you ...New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
even if the regulator survives the reversed polarity, remember that the 9v is connected to other components too. I think adding a diode directly after the socket is a very good idea.New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
Nice photo! I think, I will place tomorrow a new order at Conrad, to obtain more Recoms (10 pieces).
I saw even, they have a 6 Amp type, but not 7805 pincompatible and the priece was, if I recall right, ? 75!!!
QL has a 2 Ampere type, right?New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
Surprisingly both my QLs had 1A 7805 although I read somewhere that it would be better to use a 2A (78S05). In the service manual of the QL, a regular 7805 is mentioned (1A).
So I guess the 1.5A recom would suffice.New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... both my QLs had 1A 7805 although I read somewhere that ...New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... a discharge back into the regulator, every time the input power ...New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... (Cumana). Both have their own 7805 on them (with small heatsinks ... stress on the QL's 7805.Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... to find parts like the 7805 and the capacitors. These things ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
Without a working 7805 there would be not even ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... /> I didnt mean that the 7805 is totally bad because in ... on spectrums especially that the 7805 had worn out due to ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... /> I didnt mean that the 7805 is totally bad because in ... on spectrums especially that the 7805 had worn out due to ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
... DC converters to replace the 7805 (10x 1 Ampere and 5x ...Sinclair QL ProblemHi there. I purchased recently four Sinclair QL for a not small amount of money. Two german and two english, they are mixed: British or European conn…
Yes, I will replace the 7805 with 1.5A Recom too :) ...48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
Pulled the 5v regulator out the issue two board and replaced with new but the problem is still there, should I replace the caps too? I know that tr4 and 5 do no good as that was the first thing I tried when I first got the board48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
... socket and down to the regulator, exactly the same, wouldn't ...48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
... will be gone after the regulator. Sometimes insulation of the 220V ...48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
... voltage also feeds the LM317 regulator (REG1) that 'makes' 12V for ...QL in bits from car boot saleI was at the car boot sale today, and I bought the following for ?40: * Spectrum+ * Tape recorder * An external Microdrive (no Interface 1 unfortuna…
Just noticed that there appears to be no voltage regulator (there IS a heatsink, it's in the box). Does it use the same 5V one as the Spectrum 48k?QL in bits from car boot saleI was at the car boot sale today, and I bought the following for ?40: * Spectrum+ * Tape recorder * An external Microdrive (no Interface 1 unfortuna…
[QUOTE=Muzer;545671]Just noticed that there appears to be no voltage regulator (there IS a heatsink, it's in the box). Does it use the same 5V one as the Spectrum 48k?[/QUOTE]
No, a stronger version... 2Ampere (I think 7805CV).QL in bits from car boot saleI was at the car boot sale today, and I bought the following for ?40: * Spectrum+ * Tape recorder * An external Microdrive (no Interface 1 unfortuna…
... />
Aside from the PSU, regulator and MDV2 ribbon, does it ...
