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Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
One thing you might want to do, then, is get hold of some breadboard - and a collection of 74-series logic, and a 7805 regulator (so you can get 5 volts), a bag of 50 or so 5 volt LEDs and experiment for a bit. You'll find it very instructive. -
Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... like bags of capacitors, timers, 7805 regulators and various miscellaneous stuff ... -
Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... me is already on the 7805 for the 5v supply to ... -
Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... me is already on the 7805 for the 5v supply to ... -
Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... .
Also i tried another 7805 (from the working grey, the ... whole heatsink and 7805 that is screwed on it ... -
Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... be a problem with the 7805 regulator that´s supposed to ... -
Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... be a problem with the 7805 regulator that?s supposed to ... . It is pushed through the 7805 regulator which provides a stable ... -
Did the 128 really need that oversized heatsink?Quick question: Did the 128 generate extra heat (compared to the Plus) to warrant the new heatsink? Obviously the machine carried extra RAM and addit…
... +128K need about 1A. The 7805 have to supply more power ... -
DivIDE HelpHi all, After a rather long wait my DivIDE from Papaya labs arrived. I connected it to my spectrum, turned it on and...nothing. The green power LED…
... 5v side via a 7805 regulator (the usual 7805 circuit, the regulator ... -
Of soldering and whatnot.So. It looks like if I'm going to have any sort of active retrogaming habit in the future, I need to learn a bit more about the nuts and bolts. Emula…
... 555 timer ICs.
- A 7805 voltage regulator, and simple wall ... around the house already). The 7805 will give you the 5 ... -
I killed my SpectrumMy room was a mass of leads.... and I plugged my NES transformer into my ZX Spectrum +2 accidently, frying it :cry: , am I screwed? or is there somet…
If you're lucky, you only fried the 7805 regulator which is very cheap and common. -
+12v/-12v/9v and peripherals?Do any peripherals use the +12v, -12v or 9v lines exposed at the edge connector? Firstly, if they use +9v they won't work on a +3, since the +3 does…
... line to not overload the 7805.
Most of those ... -
What resistance should primary of a mains toroidal transformer measure?Not speccy related but still hardware. I am fixing a dual audio mixer at work. When you plug it in it blows the mains fuse straight away. Opening u…
... . The 600 watt 240-120 stepdown that I have, is less ... -
True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…
... be a combination of the 7805 + your reg, or all in ... is intending to replace the 7805 with a switch mode regulator ... -
True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…
... be a combination of the 7805 + your reg, or all in ... the heat output of the 7805. When running off the 9v ... is intending to replace the 7805 with a switch mode regulator ... -
"Upgraded" broadbandTo cut a long story short, I have just had my broadband speed upgraded from 1meg to 5meg (it was free). Having just spent over an hour setting up the…
... broadband router. Even a humble 7805 linear regulator circuit will do ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... "]
[CODE] ____
([U]7805[/U]) (Upper- right corner of ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... smoke went out of the 7805. I replaced it, then I ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... magic smoke out of another 7805. There's something else broken ... -
Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…
... supply.[/QUOTE]
When 7805 went dead, I was ... smoke out of another 7805. There's something else ... gets warm, even the 7805 stays quite cold (I ... rightmost terminal of the 7805 and connect it to ... EARTH[/B][/COLOR] of the 7805 (middle terminal). The outside ... -
PSU queryHi all, just one quick question. Are Spectrum PSU's compatible with ZX81's? I've just bought an '81 off of Ebay, which was sold as "working, but the …
... supply. It uses a standard 7805 regulator for this which requires ... -
+2 grey PSU capacitor changeHi I opened up a +2 grey power supply (2.1A max output) unit in order to replace the aged electrolytic capacitor inside, just like I always do with …
... drop-out voltage of the 7805 regulator in the Spectrum. If ... drop out voltage of a 7805 is something like 7 volts ... -
+2 grey PSU capacitor changeHi I opened up a +2 grey power supply (2.1A max output) unit in order to replace the aged electrolytic capacitor inside, just like I always do with …
... cap is used) and the 7805 can handle up to a ... -
BASin r14d - Final bugfix for the r14 seriesOk, there's not a great deal to "show" here, as most of the work has been going on "under the hood" so to speak. And there's been a [i]lot[/i] of wor…
... .
[code]
#DEFINE STEPDOWN INC H\ LD A,H ... HL
PUSH HL
STEPDOWN ; Move HL down 1 line ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... warm anyway.
A 7805 regulator shuts down when it ... /datasheets_pdf/7/8/0/5/7805.shtml[/url] ) the output and ... the output current from a 7805 regulator using a TIP3055 power ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... just a matter of the 7805 regulator then all he has ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... of heat in that little 7805 regulator) and you're ... to replace things like the 7805) which are vastly more ... efficiency out of a loaded 7805, they can be pushing ... just dropping in a new 7805 though.
... good replacement for the 7805 if you're drawing ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... to replace things like the 7805) which are vastly more efficient ... % efficiency out of a loaded 7805, they can be pushing something ... just dropping in a new 7805 though.
National Semi ... warm anyway.
A 7805 regulator shuts down when it ...
