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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…
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It acts as a voltage regulator undoubtedly but I am wondering ... -
Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…
... there's still a big low on the power supply, ... at 2.5v.... ( as power drops below 600mA, the voltage ... should rise to 9v. )
Then I look at ... 7805, and it's at nearly 6v... Clearly that ... and replace with a small regulator PCB, since I can' ... -
Building a ZX Spectrum and I have some voltage questionsI've posted about this before looking for parts, but now I've found all the hard-to-get stuff (thank you Retrolium!). So I figured new questions, new…
... noticed any significant difference in voltage on the board. The first ... me 220v). It's rated at 9v, 1.4 amps, center ... American (110v) generic brick, rated at a similar 9v DC, 1 ... and negative) are a little low since the board isn't ... -
Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... more power dissipation in the voltage regulator then...
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... assume the low end in designing, the output DC voltage could ... ).
The 7805 voltage regulator used inside the Spectrum to ... can tolerate an input of at least 25V (don't ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... ROM. These are still solderable at home with a suitably fine ... . However, it really would be low power (my current Z80 project ... 't even get the heatsinkless voltage regulator hot) and very, very cool ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... how well an Atmega microcontroller at 16MHz (which will do about ... . It's very low power - note the voltage regulator in the upper left ... fraction of the power. The voltage regulator without a heatsink runs cooler ... -
ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
... "1" value will be very low.[/QUOTE]
I ... original design).
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The level ... 0.6V/2 lower and low level is 0.6V higher ... a bad power regulator (most ICs got to high voltage).
Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …
... than 8V at 1.5A to have enough voltage for ... (without regulator) which supplies about 12V without load. At 2A there ... to a minimum peak voltage of 6.8V (can ... ) what is definitively too low for Spectrum. I improoved ... it has about 8.5V at minimum peak.
Yeuch....OMG [url]http://www.commodoreusa.net/CUSA_C64.aspx[/url]
... the beagleboard and (probably) the voltage regulator.
I wouldn't ... can configure your own OS at that price. I reserve the ... an excellent product, it's low powered and not really suited ...Yeuch....OMG [url]http://www.commodoreusa.net/CUSA_C64.aspx[/url]
... the beagleboard and (probably) the voltage regulator.
I wouldn't ... can configure your own OS at that price. I reserve the ... an excellent product, it's low powered and not really suited ... haven't looked in depth at it but if it needs ...Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…
... with the board. For voltage testing, the ULA is ... br />
- Check +5V at 7805 output. If not present ... output pin of the regulator and measure again on ... have some short circuit on low bank RAM. TR5 (ZTX213) ... in the contended bank (low 16K RAM) are damaged, ...Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... much too low and would suggest that either the voltage converter circuit ... it'd be at all useful to take a voltage reading there ... /> [QUOTE=kamilb1998;601859]
7805 regulator=4.95V
[/QUOTE]
regulator, I assume and that's ...Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... mind, rewiring the bridges at the top etc.?[/quote]
at the rear connector.
- ... sudden voltage variations that cannot be regulated fast enough by the regulator ... on) you are risking your low memory bank chips. 4164 ...Strange and faulty toastrackI just got hold of a toastrack, which is kind of strange. First of all, when I opened it, I spotted a socketed ULA and ROM, which is good, however, t…
... switching on, but with very low intensity only, means barely glowing ... and no composite signal at all.
I?m ... , open your Spectrum, check the voltage regulator and beyond that.Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... that if you look closely at the screen, the original ... from the bottom. The voltage regulator heatsink gets pretty hot, ... box of spares was low and the closest I ... , but this was rated at 50V, not the 63V ... ), but can't find anything at the moment...
ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…
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When you look at the circuit, it is a ... bit easier if you look at it in sections.
R55 ... voltage regulator). If TR8 detects that the +12V line is low, the increased voltage ... a type of AC waveform at the collector of TR9. C23 ...Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…
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First off, the LM317T regulator for the 5V was producing ... connected the TV. At which point the voltage plummeted back to 1 ... picture, but the voltage is still too low for the 9V input ... programs, but is not important at this stage.
That ...One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…
... measuring the voltage from the correct pins of the regulator? 5V ... INTO a regulator and near expected supply potential at its' output ... .
Check the voltage output ... of the PSU - 10.3V seems a little low ...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 …
... , and it usually works... but at what cost? I think the ... shown in the final diagram at the bottom of this page ... be seen it uses a voltage regulator to obtain the signal to ... /> Note that the issue of low loading also affects the colour ...The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... attention to the 7805 regulator. It had experienced a ... IMG]
Well, at least I got an image ... that I was getting voltage to all three rails. ... +12V rail was bit low but apparently within tolerance so ... /> Thanks to TheCorfiot over at AmiBay and Zetr0! I could ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
4.3v is very low for the +5v rail. What voltage are you seeing at the regulator input and output (pin 1 input, 2 GND, 3 output)?
BFixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... very low for the +5v rail. What voltage are you seeing at the regulator ...Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…
... you may also find some low value capacitors to help and ... ?trip? current, the regulator will reduce the output voltage until the current ... warm at all, not even the tracks leading up to the regulator ... down, at which point it explodes :-o. An input voltage that is ...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 …
... range, if the needle is at the left hand side of ... metal tab of the LM317 voltage regulator to the case/heatsink should ... the LM317 voltage regulator we are looking to get a low resistance reading ...Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…
... quote="patzik;873297"]Looking at the schematic I see ... distorted and smooth out at some points, in sync ... +5V, to hold them at a steady logic high) and ... gone from a normal very low value (less than 2 ... heat sink of the 7805 voltage regulator.
[b][ ...Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
... ] PSU, the input voltage can be as low as 7.5V DC ... more heat the 7805 voltage regulator chip has to pump into ... work with a higher input voltage.
An unexpanded ... run off a PSU rated at 1A. But a PSU rated ... at 1.4A or greater is ...Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
... ] PSU, the input voltage can be as low as 7.5V DC ... more heat the 7805 voltage regulator chip has to pump into ... run off a PSU rated at 1A. But a PSU rated ... at 1.4A or greater is ... thought to keep that linear regulator running cooler. I'll almost ...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 …
... Solder suckers are better at clearing solder from the ... />
Apart from low value electrolytic capacitors, you should ... with a 22uF). The voltage rating should either be the ... voltage regulator.
It is possible to replace some of the low ...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 …
... br /> That's not a regulator, that's a power transistor ... coil of a transformer. Typically at a high rate like around ... same amount of power, high voltage = low current. Which means losses are ... In fact: voltage across component x current through it (at any moment ...Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... bloke living in the Netherlands. At the young age of 12 ... 16 KB was a bit low and a Spectrum + 48 KB ... Spectrum + (new capacitors, keyboard membrane, voltage regulator, etc.) and brought it back ...
