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Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…
... lead of your meter for voltage testing is either the outside ... metal tab where the 7805 voltage regulator attaches to the black metal ... together, or with the 7805 voltage regulator, you could short a pin ... the tab of the 7805 voltage regulator).
[I][B ... -
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…
... in a "normal" PSU the voltage regulator will be destroyed and possibly ... -
IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…
... resolved with a different PSU/Voltage regulator.
I have no ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... other night, very informative, the voltage regulator didn't meet the requirement ... -
New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…
... of +9V to power a voltage regulator that creates independent +5V on ... -
Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
... new thermal paste to the voltage regulator/heatsink.
The spectrum ... -
Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
... new thermal paste to the voltage regulator/heatsink.
The spectrum ... -
FS: Toastrack[URL="http://www.ebay.co.uk/itm/111188603251"]Here[/URL]
... has had a higher rated voltage regulator fitted, new transistors and has ... -
Didaktik Gama and M manualsI?m looking for manuals for the Czech Spectrum clones Didaktik Gama and M. Thought this would be an easy task, but I couldn?t find any user or servic…
... get a higher-voltage SMPS and an adjustable voltage regulator, something like an ... -
eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …
... low and affects the output voltage from the ULA (as shown ... be seen it uses a voltage regulator to obtain the signal to ... is converted down to a voltage level suitable for the BLANKING ... -
Some problems with 2 ZX Specturm board'sHi, last week i got some ZX Spectrum stuff. Also 2 ZX Spectrum 48K's, one in the orginal case the anoter one in a DK'tronixs case. Both have problem'…
... getting a [B]negative[/B] voltage on this pin or a ... positive voltage?
If you are getting ... .
On the 7805 voltage regulator, connect the black negative lead ... outside pins of the 7805 voltage regulator chip. One should be +5V ... -
Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... board blowing up (see reverse voltage).[/QUOTE]
Shorting +12V ... power supply (transformer windings and voltage regulator) will likely be a good ... you were to measure the voltage (on either +12v or +5v ... -
Using a Euro Sinclair PSU in UKI've got a EURO1400 PSU with a Euro plug. Am I right in thinking I can just cut the pug off and change it to a UK plug, and it will work fine? The on…
... problem. Worst case - the output voltage of the PSU may be ... be dissipated by the 7805 voltage regulator.
It is however possible ... not connected to the Spectrum) voltage will be higher (typically between ... -
+2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…
... on D20 (near the 7805 voltage regulator) cathode (lead nearest the front ... -
Cooler padI have this cooler pad that prevents an old laptop from getting overheated like hell. It is powered by plugging it to the usb port. I don't have a sp…
... /> [/QUOTE]
Its a voltage regulator. I believe its switched and ... -
Cooler padI have this cooler pad that prevents an old laptop from getting overheated like hell. It is powered by plugging it to the usb port. I don't have a sp…
[QUOTE=rune;756764]Its a voltage regulator. I believe its switched and ... more efficient than a linear regulator. -
+3 Power SuppliesI have about 4 spare +2A power supplies. Can I use these with the +3, or is there any difference?
... both use the same 7812 voltage regulator chip.
We don ... loaded will reduce the output voltage somewhat.
[I][B ... -
PSU Overvoltage?Going through a pile of 48k PSU's today, rewiring and fitting new plugs, testing each one as I go I came across one that outputs 14.85v, usually im g…
... br />
Normal on load voltage should be between 10.5V ... and sometimes too higher input voltage may cause damage.
The ... ) can handle a higher input voltage.
The second ... be released by the 7805 voltage regulator.
[B][I]Mark ... -
Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …
... go in. Also got new voltage regulator which can also go in ... -
Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …
... would say that the 7805 voltage regulator is okay, so does not ... -
Heatsink's for ZX SpectrumAre heatsinks usefull for the chips are used in ZX Spectrum's On eBay I saw some heatsinks for ULA's, 3 for +/- 8 dollar's. And I want to know are th…
... boards:
The 7805 voltage regulator "chip" already has a heatsink ... -
12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :( I do however have a 12v 2amp PSU, if I reverse the polarity so t…
... .
As the 7805 voltage regulator will have to work harder ... (due to the higher input voltage), I suggest you start off ... to test the PSU output voltage when it is actually powering ... -
12v in a Spectrum +2My Speccy 128 +2 requires a 9v 2.1a PSU, all my 9v PSU's are much below 2.1 amps :( I do however have a 12v 2amp PSU, if I reverse the polarity so t…
... .
As the 7805 voltage regulator will have to work harder ... (due to the higher input voltage), I suggest you start off ... to test the PSU output voltage when it is actually powering ... -
Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... caps (changed those) and the voltage regulator (which I also changed). Could ... -
Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... the tab of the 7805 voltage regulator (where the heatsink attaches), use ... lead of each resistor. The voltage on the other end will ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
I'll check the voltage level while leaving it running ... power supply, or replacing the voltage regulator (could it be dropping the ... voltage as it heats up?) or ... component on the board causing voltage drop?
Any links ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... checked the 5v from the voltage regulator and it doesn't drop ... components getting hot are the voltage regulator and the ULA. -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... checked the 5v from the voltage regulator and it doesn't drop ... components getting hot are the voltage regulator and the ULA.[/QUOTE]
AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... three legs is probably the voltage regulator, that will get very hot ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... describing is a 3.3V voltage regulator. It reduces the +5V supply ... /plus/128k+ machines the 7805 voltage regulator works so hard, it has ...
