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Clamping Speccy InterfacesThere are a huge number of broken Speccy interfaces available . I came across one on Ebay recently said to be "partly working" or similar .Why are th…
... original ones are a linear regulator, they use a very simple ... resistor that dissipates the wasted power as heat. Which is why ... pin out, a switch mode regulator. It works in a different ... very quickly, based on the power being drawn from it. So ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... quote="harriusherbartio;915573"]So this regulator does not need the mica ... that is, a higher current regulator does not offer any improvement ... current of any of the power supply components.
Of ... has the rest of the power supply components suitablely rated ... -
ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... speaker is okay, when you power on, after a few seconds ... the Spectrum disconnected from the power, it may be worthwhile testing ... heatsink of the 7805 voltage regulator), using a test probe, test ... -
Re. new Spectrum Hardware :What are the advantages and disadvantages of Crowdfunding for WOSSERSIn other words who and how does it help?
... this relates to what the Regulator in the UK has been ... ) . It is a kind of "power of the mini patron" which ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... .
I replaced the regulator with a Traco and tested ... RHS of the PCB . On power up I got vertical blue ... -
How to connect universal PSU?A fleamarket find! Spectrum+ without PSU. :) I don´t know if it works. I have universal PSU, please confirm which is the correct polarity? [b]A)…
... not enough current (and therefore power) for a normal typical ZX ... modified? Maybe with a switching regulator in place of the heatsink ... -
How to connect universal PSU?A fleamarket find! Spectrum+ without PSU. :) I don´t know if it works. I have universal PSU, please confirm which is the correct polarity? [b]A)…
... modified? Maybe with a switching regulator in place of the heatsink ... regulator. A modern switching regulator is much more efficient, so uses less power ... -
48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... way off. If the voltage regulator, capacitors, and TR4 and TR5 ... in this part of the power supply circuit as a failed ... as well while fault finding) power up again and retest the ... " RAM chips back in. Then power up. If the Sinclair Copyright ... -
48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... replaced the voltage regulator with a Traco Power TSR1-2450.< ... HOT. I disconnected the power immediately, removed TR4 and ... installed, and when the power is applied the voltage ... E=.9mv. Leaving the power connected, I got a ... don't kill the power. I have scoured the ... -
Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... heatsink for the 7805 voltage regulator getting rather hotter than normal ... have not had the official power supply modifications done, may damage ... -
Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... heatsink for the 7805 voltage regulator getting rather hotter than normal ... same polarity as the Sinclair power unit. All that is academic ... -
Interference when using modern PSUMy 48k revision 3 spectrum with a basic 1 wire composite video mod works perfectly with the original power supply. However When I use a modern regula…
... the capacitor in the original power supply so hopefully many years ... upper memory IC
Replaced regulator with new Traco version
Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... µF) on the ULA’s power rails and temporarily soldered another ... large-value electrolytics on the power rails. Going from 22 µ ... will eventually kill something during power on/power off.
... the output of the 7808 regulator, another 22 µF between ...Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... a few caps to the power rail seemed to have toned ... . Should I replace the voltage regulator, while I’m at it ...Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
Before you replace the 7805 regulator, try powering the machine from a decent regulated 9V power supply. It’s a must for any Speccy (48K–128K) owner, anyway.Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... little odd that the regulator is dissipating so much power as heat.Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... the current going into the regulator and then out of it ... definitely loading one of the power rails way more than it ... . Measure apparent resistance on the power input jack (with the machine ... ’s less than that, the regulator has probably gone tits up ...Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... Ω you’re getting on the power jack. Something’s not quite ... right with the power supply circuitry. Could the be regulator, could be ... they’re okay, replace the regulator and measure the resistances again.Clamping Speccy InterfacesThere are a huge number of broken Speccy interfaces available . I came across one on Ebay recently said to be "partly working" or similar .Why are th…
... have changed . Maybe the lower power requirements of the new chips ... upsetting the Zx Spectrums limited power abilities re addon interfaces .
2) The power aspect . I cannot answer this ... Spectrum as well (eg Switching regulator etc)?Clamping Speccy InterfacesThere are a huge number of broken Speccy interfaces available . I came across one on Ebay recently said to be "partly working" or similar .Why are th…
... should see what are the power draws for each interface, but ... recapped and change the voltage regulator for a Recom alternative (http ...Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... a Traco Power TSR 2-2450 to replace its legacy regulator, or ... the Traco Power TSR 1-2450 5v 1a switch mode regulator. Similarly ... 5V DC/DC converter / switching regulator would be suitable.
regulator), the inside of the ...Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... discard the old Sinclair/Amstrad power bricks now, these machines ... unregulated power supplies. On that basis, replacing the voltage regulator to ... combination with the decent new power supplies, should only benefit ... for a new switch mode regulator, it's a no- ...Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... a 2a Traco Power switch mode regulator.
Power wise, all three ...Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... a decent 9v 2a regulated power supply (same make as the ... the new 2a switch mode regulator fitted to the machine. The ...PowerI am looking for a Zx Spectrum+ power supply and a cable to monitor. Does someone have one that they do not use, and want to give it away, I cannot …
Yes you can! Power supply needed is as ... for the internal 7805 type regulator. Any higher voltage just ... heat loss in that regulator, and thus hotter insides ... a 10V DC / 2A power supply would do. A 9V ... good.
Suitable power supplies are easy to find ...Does Survivisection load & play on a real +2a?Hi All, My apologies, another question.. Would someone with a DivMMC and a +2a be able to confirm whether Survivisection runs and plays on it? …
... a failure of the voltage regulator caused the RAM chips to ... /> Sending the +2 (without the power supply to save weight) to ...Does Survivisection load & play on a real +2a?Hi All, My apologies, another question.. Would someone with a DivMMC and a +2a be able to confirm whether Survivisection runs and plays on it? …
... a failure of the voltage regulator caused the RAM chips to ... /> Sending the +2 (without the power supply to save weight) to ...Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
... that this is a ‘pre-regulator’ circuit.
This is ... resulting power dissipation) being handled only by the 7805 voltage regulator ... ZX Spectrum, the ‘pre-regulator’ circuit reduces the voltage down ... a schematic of a pre-regulator circuit:
[img]https ...Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
... that this is a ‘pre-regulator’ circuit.
This is ... resulting power dissipation) being handled only by the 7805 voltage regulator ... ZX Spectrum, the ‘pre-regulator’ circuit reduces the voltage down ... a schematic of a pre-regulator circuit:
[img]https ...Power supply voltage regulator circuitRelating to [url="https://www.worldofspectrum.org/forums/discussion/56142/"]this topic[/url] I have managed to acquire this little accessory, which I…
... /wiki/Voltage_regulator#Transistor_regulator"]Zener regulator[/url] to me. ... /> This type of voltage regulator is not very precise. Which ... . Used to test how regulator responds to (large & ... power supply [i]if you want[/i]. Or replace internal regulator ...
