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+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... said and build yourself a regulator board. It's dead simple ... you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ... -
+3 external floppyI'd like to connect 3,5" PC floppy drive (NEC) to ZX Spectrum +3 (with diode for RDY). Here are questions: 1) It seems the PC floppy uses just +5V, …
... said and build yourself a regulator board. It's dead simple ... you need only a 7805 regulator IC and two 0.1uF ... feed the input of the regulator (pin 1) with it's ... -
Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
... , apart from the 7805 voltage regulator) that gets measurably above ambient ... -
5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?
... use a twin 7805 based regulator and power it with a ... -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... supplied by the 7805 voltage regulator, the rest by a small ... -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... supplied by the 7805 voltage regulator, the rest by a small ... -
Need advice choosing one of these optionsA few spanish friends are willing to help me build and program the ethernet interface for the Speccy. Here are the possibilities. Any advice would be…
... and a 3.3v voltage regulator and one of those sockets ... -
RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…
... it to the onboard voltage regulator to give the 5V the ... -
Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …
... serious.
Running the regulator without a heatsink is not ... -
Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …
The regulator has overheating/short circuit protection ... * the +5v rail if the regulator shuts down. It might not ... is sufficient to warm the regulator up fairly quickly.
TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... runs entirely off the 7805 regulator. All the other digital parts ...TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... /> A final question, for voltage regulator (7805) i used one with ...TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
[QUOTE=gtsamour;187043]
A final question, for voltage regulator (7805) i used one with the indication "L7805CV", is it appropriate?[/QUOTE]
Yes, it this an 7805 regulator from "ST Microelectronics". :-)l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …
... takes its load off the regulator. You should raise the resistor ...l.e.d question about zx81hi i know this is a spectrum forum but... ive just repaired my zx81 for the 3rd time and was wondering if it was possible to put a led in to show if …
... takes its load off the regulator. You should raise the resistor ... some more mA load on regulator this change some thing.
48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... photo i see a power regulator in the top right corner ...Should +2's Be left turned on to save games?Hi, Forgive me for asking you guy's a daft question but, I was just wondering what you think about leaving a Spectrum +2 turned on all the time. The …
... I had a suitable 9Volt Regulator:lol:
But I ... 't need the 9 volt regulator, the normal Speccy PSU is ...The Fool's Workplace SurveyI thought I'd try and find out more about what my fellow WOS'ers are up to during their work hours, so I've compiled a simple survey. Overwrite my an…
... attitude to it, and the regulator..
What hours do ...ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... you have killed the voltage regulator only, possibly far worse - the ... />
"Reverse polarity destroys the regulator almost instantly. To avoid this ... short 'test' could destroy the regulator if a protection diode is ...ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... you have killed the voltage regulator only, possibly far worse - the ... checked out fine. If the regulator isn't fried, i don ...+3 Sound Mod.Hi All, I am very much a novice when it comes to building electronics, but I thought I'd have a go at [url]http://www.geocities.com/sinclair_bitz/st…
... an "early" revision there, the regulator should be removed from the ...+3 Sound Mod.Hi All, I am very much a novice when it comes to building electronics, but I thought I'd have a go at [url]http://www.geocities.com/sinclair_bitz/st…
... also see i've removed regulator voltage chip.
Edit: Also ...Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …
If you're powering it from the PC, probably the easiest way of getting that 6 volts is to use an adjustable linear regulator off the PC's 12v. If you want to be efficient, you'll use a switch mode supply instead :-)Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... the other fault was the regulator heatsink touched the metal case ...Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …
... diode (1N4007) from a 7805 regulator ground pin down to the ... , 16V electrolytic cap at the regulator's output pin to ground ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... the other fault was the regulator heatsink touched the metal case ...
