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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 …
The reason for having two cables is to have more current carrying capacity and lower the impedance. They are probably connected together on the floppy drive motherboard, they are certainly connected together on the power supply circuit board. -
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 …
... to test if a DC power connector is correctly wired, is ... " (GND), or "common". Whenever testing power supply voltages, the black (or ... when working on the PSU (power supply unit). But when testing ... , in some (but not all) circuit designs, the digital GND system ... -
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 …
... collected and returned to their (power) source. Usually this GND is ... , in some (but not all) circuit designs, the digital GND system ... -
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 …
... discolouration ), on the printed circuit board where the bridge rectifier ... the Spectrum from the Opus Power supply , and utilized the ... original Spectrum power unit which was going spare ... parallel powering as the power sources are not linked ... -
Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... voltage from the external "9V" power supply is okay (when connected ... much current (like a short circuit)
Of course, it ... -
Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... . I'm using my regulated power supply at 9V, not the ... find strange that a short circuit appears systematically after a couple ... -
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 …
... to draw too much current (power) from a transformer that is ... during the design of the circuit they are included in. As ... -
+2 Grey - bluey about to blowI've been turning the TR4 bits around inside my Spectrun +2 Grey issue 3 and noticed that it looks like the blue guy is about to burst.... (I had ph…
L4 is part of the filtering for the 5v analog supply. It is used in the analog RGB out and to power the UHF modulator and the FM audio modulation circuit. -
Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …
... case, balanced that above the circuit board and triggered key presses ... surrounded by different equipment (TV, power supply, etc.). Nevertheless, it strikes ... -
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 …
... on).
The "9V"power output from the Opus on ... a very short duration short circuit, but if shorted for more ... -
Almost perfect RGB signal: +2aI'm using an RGB to scart lead on my +2a and the picture is almost perfect except for anything black on bright white. For example, the copyright mess…
... benefit of having a power plug passthrough to power the cable would ... cutting a track on the circuit board which for most people ... -
So I did a thing...And it's nearly ready for release: [img]http://s18.postimg.org/4453ayo5j/Screen_Shot_2016_03_30_at_16_18_17.png[/img] Apologies for the enormou…
... inside a line
Short-circuit boolean evaluation for numeric AND ... a. Also for -=,*=,/= -and- %= (mod) ^= (power) &=,|=,~= (AND/OR/XOR)
So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…
... to work with directly. My circuit is using 150 + 330 ohm ... using 75 ohms.
* Power supply decoupling appears to be ...Modifying Commodore datacorder's for Speccy use. Is it possible?Just wondering if it's possible to modify a Commodore datacorder for use with the Speccy, or if anyone has. My assumption is the output and input on …
... motor from the computers 5V power
Ingo.[/quote]
circuit being sold on eBay:-
power connections. Again if there is ... datacorder I might add a power switch with a LED, and ...Modifying Commodore datacorder's for Speccy use. Is it possible?Just wondering if it's possible to modify a Commodore datacorder for use with the Speccy, or if anyone has. My assumption is the output and input on …
And just make a circuit board that will accept the commodore plug, and house it in a little box to run your power into. Mount the ear and mic sockets on the box.Modifying Commodore datacorder's for Speccy use. Is it possible?Just wondering if it's possible to modify a Commodore datacorder for use with the Speccy, or if anyone has. My assumption is the output and input on …
... is to make up a circuit on some strip board first ... add sockets for the datacorder, power, ear, and mic etc.Where could I buy a B1367Y transistor in the UK?I'm after a B1367Y transistor, must be T-220 package type that can be mounted to a heatsink. Anybody know where I can buy them in the UK? Tried Googl…
... transmit. I have removed from circuit and tested both final RF ... user sometime, as with little power you can talk with folk ...Spectrum +2 Grey internal cassette connectorIs it possible to buy the internal white cassette connector (the bit with pins on the motherboard and the bit that dangles from the leads) from Mapli…
... months ago. Computer only, no power supply.
my boards ... /> Maybe a +2 grey cassette circuit board revision thread is needed ...Spectrum issue 4SI have an almost completely depopulated issue 4s board. Wondering what to do, repairs or spares? I hooked it up and the voltages are off, 5v is fi…
... when measuring in circuit. After looking through the whole power section, I ... out and measured out of circuit, and it was faulty. Strangely ... by the previous owner. Anyway power section is fine now, now ...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 …
... when losses in the 12V circuit do increase the level of ... , which signals have a private power supply and therefore a private ... disks drives with a "differing" power supply connector . But I agree ... alleviating or "beefing up" the power supply when 2 drives and ...Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…
... a schematic for the onboard power supply circuit on the web and ...Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…
... , I've checked the onboard power supplies and they look okay ... (shown as 1K8 on the power supply schematic) and R54 (shown ... power supply schematic) set the actual output voltage. Due to the circuit ... each other when tested in circuit with a meter via the ...thinking on creating an arcade... somethingHi to all For a while i have been thinking on creating an Arcade Cabinet, but the cost, time and space necessary place it in hold. Recently whi…
... encoders are little thumb-sized circuit boards with two-pin sockets ... joystick. It gets all its power from the USB port. As ...Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…
... the mains via a Sinclair power supply. Two wire mains lead ... />
If you used the circuit schematic you posted earlier, and ... being supplied by a Sinclair power supply, and the TV has ...+2A PSU ResurrectionHi all. I have a couple of +2A machines and a +3 with PSUs for each but I'm having a problem with one of them. I've replaced the internal glass…
If the power supply suffers from a short circuit or output overload, one ... br />
Which model of power supply are you having problems ... with? Only the power supply for the +2A / + ... disk drive. Whereas the +3 power supply is happy to run ...+2A PSU ResurrectionHi all. I have a couple of +2A machines and a +3 with PSUs for each but I'm having a problem with one of them. I've replaced the internal glass…
... ;879842"]If the power supply suffers from a short circuit or output ... ...
Which model of power supply are you having problems ... with? Only the power supply for the +2A / +2B ... disk drive. Whereas the +3 power supply is happy to run ...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 …
... been wrongly described in some circuit diagram somewhere )).[/quote]
The ... number, which stands for 'Low power'. Both S and LS are ...Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …
... 150 ohm resistors in the circuit for each colour channel will ... quality, or draw too much power?[/quote]Err, what composite video ... happy. If not, a simple circuit can be made to boost ...Just had the weirdest power cut ever Oothis morning i was posting Johnny Cash songs on google+, then i took the dog out. Came back noticed the downstairs lamp was flickering so thought it …
... and again here where the power doesn't just go out ... it's intermittent shorts. The circuit breakers open and close a ... to normal or a full power cut.ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…
... I've already checked the power rails all over the board ... ordered one of 4116 replacement circuit board. It should arrive in ...
