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UPS power supply noise (odd one)I've got an APC Smart-UPS 700 Had it for about three years no problems with it at all. It was 'used' when I got it. Yesterday I powered it down fo…
... left it turned off (no power input) as I did not ... -
ZX Spectrum Pre-regulator DesignCarrying on from the "[URL="http://www.worldofspectrum.org/forums/showthread.php?t=44486"]Issue 2 crashes after about 30 mins[/URL]" thread... [QUOT…
... reverse polarity protection and a power on LED. If you ... />
Here is the provisional circuit diagram / schematic:[IMG]http://farm4 ... LED
TR1 .... NPN power transistor, IC max of 1 ... peripherals or expansions that draw power from the Spectrum, or are ... -
Ferguson 3T31 circuit diagram availableFinally managed to get the circuit diagram for this beastie. I'll upload it to WoS soon enough, in the meantime, PM me with your email addy if you w…
Finally managed to get the circuit diagram for this beastie. I'll upload it to WoS soon enough, in the meantime, PM me with your email addy if you want it. -
48k+ Power Supply quickieGuys, Can someone tell me if I can safely use the power supply of the 48k+ in a 48k? My guess is yes, but I don't want to do something I will regre…
Guys,
Can someone tell me if I can safely use the power supply of the 48k+ in a 48k?
My guess is yes, but I don't want to do something I will regret :)
Thaks,
Ant?nio -
Spectrum 48k video and keyboard issueHi all, few days ago I experimented with battery supply for my speccy (48k issue 2), and I was measuring the voltage and how much current it used. A…
... /> So a short circuit at the input power plug of the speccy ... . The battery had short circuit protection ... -
Can you use a ZX81 psu to power a ZX80?Can you use a ZX81 psu to power a ZX80 without causing any Damage? Cheers
Can you use a ZX81 psu to power a ZX80 without causing any Damage?
Cheers -
Spectrum +2 power supply replacementI bought my first Spectrum the other day, a grey +2, but it seems that the power supply is busted (I've tested it with a multimeter and tried replaci…
... , but it seems that the power supply is busted (I've ... 'd rather get a replacement power supply.
From what ... -fixed-voltage-switched-mode-power-supply-48484"]this power supply[/URL] should ... 't understand a lot about power supplies so I wanted to ... -
I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…
... sent the machine nuts on power up, and simultaneously produced the ... in the future out of circuit to avoid disasters like the ... -
Audio fix/Stereo on a Spectrum +3 (one with bad sound circuit) *WAV file includedMy Spectrum +3 that I got a while back (converted now to +3e with CFlash Card) was one of the early releases that had the bad sound circuit. Tried a …
... that had the bad sound circuit.
Tried a few different ... -
Any Megadrive fans around?Just a bit bored...and if you're bored :) The Megadrive (Genesis here in the US) was my 2nd or 3rd console I bought new back in the day (the Speccy w…
... of having to use 3 power supply adapters, the 3 in ... 1 system has no power brick, just a power cable like the ... up with a pretty decent circuit with good results.
Not ... -
Favourite things to do in a power cut threadApparently we have yet another power cut at home, this is after 35 hours without any leccy over Christmas Eve/Christmas Day. Suggestions for favouri…
Apparently we have yet another power cut at home, this is ... things to do in a power cut please. I'll print ... -
Timex Compute TC2048 loading problems solvedHi everybody, I've just finally fixed a TC2048 that had numerous problems. Once I'd changed all the RAM, the CPU and the ULA (surface mounted, for a…
... the power circuitry! The tape signal goes through an amplifier circuit which ... the output on the NPN circuit). I realised that the -5V ... -
+3 Power SuppliesI have about 4 spare +2A power supplies. Can I use these with the +3, or is there any difference?
I have about 4 spare +2A power supplies.
Can I use these with the +3, or is there any difference? -
48k + Issue 3B Power SocketHi All, Trying to get a Issue 3b resurrected that had a faulty power socket. The socket has come away from the board and peeled away some of the tra…
... resurrected that had a faulty power socket. The socket has come ... -
spectrum +2 power supplyHello guys, I'm after a spectrum +2 power supply, if anybody has one to sell please pm me, thank you
Hello guys,
I'm after a spectrum +2 power supply, if anybody has one to sell please pm me, thank you -
Power connector for 48K SpectrumI need a new power connector for an Issue Two 48K Spectrum board, quite an early one. Where can these things be obtained? Someone must know! There mu…
I need a new power connector for an Issue Two 48K Spectrum board, quite an early one. Where can these things be obtained? Someone must know! There must have been a load of these sourced for Harlequin projects, and also for Spectrum fixes. -
DivMMC EnJOY! I do enjoy!!!!!Hi all! Ok, so I grew up in the UK in the 80?s and convinced my parents to buy a 48k Spectrum ?to help with homework? lol. Well now I am older and ha…
... circuit board and swapped their positions and then resoldered, thus the power ... push in the new chip. Power up and behold!!! DivMMC EnJOY ... -
Issue 4S differencesI decided to buy an Issue 4S PCB after reading much about them on here. It was originally in a plus case which didn't come in the sale. I've been run…
... 's because the Spectrum video circuit already operates the video inverter ... be. The 12V and -5V power supply is much quieter than ... -
+3 Power supplyJust a quick question: Can a the +3 power supply be used with a +2A? I always thought it could but one of the Amps is higher. I'm sure this doesn't m…
Just a quick question:
Can a the +3 power supply be used with a +2A? I always thought it could but one of the Amps is higher. I'm sure this doesn't matter but thought I'd better check before using.
Thanks. -
ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…
... ]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE]
The circuit below is an experimental circuit.
It has ... -
ZX-FPGA dev boardI've been sporadically working on this: [IMG]http://photo.alioth.net/tmp/spectradvi.png[/IMG] It's an FPGA dev board for the Spectrum. It uses a CP…
... from the FPGA and 4 power pins (2 grounds, one 3 ... layers (with solid ground and power planes).
There's ... control the Spectrum's reset circuit, but once that's done ... -
Power sockets for 48k'sPretty sure there was a thread about these not long ago but I cant find it. Basically im after the power in socket for 48k's and grey +2's, got two …
Pretty sure there was a thread about these not long ago but I cant find it. Basically im after the power in socket for 48k's and grey +2's, got two here that require one each. Anyone point me in the right direction? -
+2a/b power questionWill a power supply from a +2a/b be sufficiant to run a +3 if no other devices are connected to it? i know its not ideal but its all i can put my ha…
Will a power supply from a +2a/b be sufficiant to run a +3 if no other devices are connected to it? i know its not ideal but its all i can put my hands on. -
Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…
... was wondering about how to power it, because the original PSU ... runs on 9v from the power brick, this is actually regulated ... would be possible to simply bypass the regulator, and inject a ... -
Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …
... what happens:
On power on, the Spectrum has black ... of the socket against the circuit diagram: all okay.
Grey+2 power socketDoes anyone know who sells these, I've just bought a slightly melted but still fully functional +2, just has a dodgy power socket. I did have some sp…
... +2, just has a dodgy power socket. I did have some ...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…
... a 48k 1984 Issue 6a circuit board that I was told ... the problem lies with the power convertor circuit but I'm now ...PlusDlite v2014.1 - problems with floppy power supplyI received a small batch of boards of the new PlusDlite design, which is similar to the original PlusD, with GAL etc. The main differences with the o…
... the use of an external power supply.
I thought I ... (voltage level?) problems with two power supplies, but I hope someone ...Spectrum 48k Power On ProcessI have a 48k Spectrum here that maybe does something strange on power on. Could somebody confirm what is meant to happen when power is applied? On …
... maybe does something strange on power on.
Could somebody ... is meant to happen when power is applied?
On ...ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…
... br />
The area of circuit board that houses the voltage ... converter circuit (top right) had been ... them and re-assembled the circuit one component at a time ... diagram of the voltage converter circuit to hand while thinking about ...
