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Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650? I've read that TIP31 will do the trick. Is there a decent equivalent from the BC or …
... wide and send too much voltage through R60, R61 and the ... -
ZXSP Emulator running too fastHi All, I was wondering if any of you have had a problem whereby the zxsp emulator runs too fast so won't load games etc? For example, when loading…
... (SCLD in this case) output voltage changes as the output bit ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... a line with a lower voltage span. You then have to ... -
I so would like a spectrum one of theseI so would like a spectrum one of these [url]http://jledger.proboards19.com/index.cgi?board=dtvhacking&action=display&thread=1167546608[/url]
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Alternatively: Batteries with higher voltage and lotsa capacity, that are ... -
I smell burningLast week my computers PSU blew a fuse. I looked to replace the fuse but is solder in place. Feeling lazy I just got my spare PSU of the shelf and r…
... circuit was ramping up the voltage continuosly in an a vain ... -
Spectrum +2 No TV PictureHi, As a retro collector in Australia I thought it was time to check out a real Spectrum as they were never popular here. So I bought the Spectrum +…
... as there is a DC voltage also present on the wire ... -
Can a 48K PSU power a 12K Speccy?Hiya Does anyone know if the 128K speccy (the heatsink one, not a +2 or +3) can run using the same PSU as a 48K rubber keyed jobby? Have been think…
... is enough to drop that voltage to around 9V. The Spectrum ... -
Can a 48K PSU power a 12K Speccy?Hiya Does anyone know if the 128K speccy (the heatsink one, not a +2 or +3) can run using the same PSU as a 48K rubber keyed jobby? Have been think…
... will cause more heating of voltage regulator.
Maybe good ol ... -
Stupid ponderingsI just got a XM1541 cable for my C64 hard drive to allow me to write d64 images directly to c64 disks. Works great and I love it. Anyway, its got m…
... powersupplies of approximately the right voltage are cheap and common (and ... wart plus a 30p linear voltage regulator is probably all you ... -
Audio level on a grey +2Hi all, I received yesterday my "new" Spectrum 128+2 grey. It's a french one (without modulator, and with specific roms : message in french). First …
TTL is Transistor-transistor-logic. Works at a voltage of +5v. Often mistakenly quoted as meaning Transistor-transistor-level, which it isn't.
Means that the input to your TTL monitor should be at +5v. -
Audio level on a grey +2Hi all, I received yesterday my "new" Spectrum 128+2 grey. It's a french one (without modulator, and with specific roms : message in french). First …
... -transistor-logic. Works at a voltage of +5v. Often mistakenly quoted ... -
Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
... capacitor charges up when the voltage is highest, and when ... to by placing an appropriate voltage regulator downstream of the cap ... output, then a 9v voltage regulator downstream of the capacitor ... 't fall below the minimum voltage the regulator will regulate - ... -
Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
... as a current amplifier, the voltage stays pretty close to the ... regulator's output voltage, minus half a volt or ... due to the output trannies voltage drop. If this is important ... diode) will raise the output voltage by the right amount. Depending ... -
Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
... inside one) has its own voltage regulator, so the whole exercise ... -
Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…
... inside one) has its own voltage regulator, so the whole exercise ... -
speccy +2 rgb socket driving me crazy!until today I was using RGB pins 1 and 2 for composite out. Tonight I suddenly get mad and decided to build a proper RGB Scart cable. Having read P…
... diode to provide a steady voltage.
You can probably ... circuit, it'll make the voltage at the junction of the ... good). Google or Wikipedia for 'voltage divider' and 'Ohm's Law ... -
speccy +2 rgb socket driving me crazy!until today I was using RGB pins 1 and 2 for composite out. Tonight I suddenly get mad and decided to build a proper RGB Scart cable. Having read P…
To be sure that the 5v doesn't hurt pin 16 on your tv, you usually only need a resistor at ca 1K in series between the computer and pin 16. All tv's have internal circiuts to prevent this voltage from getting too high anyway. -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... opinion, could this 5V ghost voltage be responsible for frying the ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... , he simply (unwittingly) placed a voltage (from the tape deck) onto ... NOT supposed to have a voltage placed upon it. Remember that ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... to happen). Especially if this voltage is going to what's ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... , he simply (unwittingly) placed a voltage (from the tape deck) onto ... NOT supposed to have a voltage placed upon it. Remember that ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... " post. The guy put a voltage where is didn't belong ... -
Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... , he simply (unwittingly) placed a voltage (from the tape deck) onto ... NOT supposed to have a voltage placed upon it. Remember that ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... how to solve the different voltage problem.[/QUOTE]
... pack that holds the highest voltage required, and then use regulators ... to obtain the lower voltage needed.
A ... steady even if the battery-voltage starts to decrease a ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... how to solve the different voltage problem.[/quote]
Hmmm ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... 't even get the heatsinkless voltage regulator hot) and very, very ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... very low power - note the voltage regulator in the upper left ... fraction of the power. The voltage regulator without a heatsink runs ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... places, the input of the voltage regulator) just by checking continuity ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
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I guessed about the voltage regulator and assumed that it ...