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Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…
... s just not that many decoupling capacitors on this board and ... minimal and somewhat poorly placed decoupling (the EPROM and the main ... and should have good local decoupling. And this is only a ... be attributed to power supply decoupling issues?
I ... -
Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... connected by composite with a decoupling capacitor. Many thanks in advance ... -
winston's diagnostics boardHi Winston, I've recently built your diagnostics board on project board and am having huge problems getting it running. I've been pulling my hair ou…
... ? I'm hardly using any decoupling caps, could this be it ... -
Multiface 1 (Romantic Robot) RepairHello there my fellow ZX'ers! recently I got an Interface 1 + MicroDrive from a friend and since then I have been having awesome geeky moments in fr…
... ... not a single capacitor (even decoupling mono's are not there ... -
Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... have snipped out the -5V decoupling caps for the RAM, just ... -
DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... may be helped by adding decoupling capacitors across power connections to ... -
Newbie Hardware QuestionsI just recently aquired my first Spectrum, a +2, and I'm in the process of getting acquainted with it. Being a newbie I had some questions, which …
... the TEA2000 and another for decoupling the sound from the video ... -
Issues with Spectrum 48K on SCART input of LCD displaysHi *! I'm new to the forums, but not new to ZX Spectrum. I have bought a ZX Spectrum 48K in 1983 and own it since. It was stored some 20+ years on…
... mod: the direct wire, the decoupling capacitor and the single transistor ... out of sync.
With decoupling capacitor, the picture is much ... -
Re-created Multiface 128Just bought the bare board from the Bay and am wondering if anybody else on here has built one? Well made PCB, doc files online including a BOM an…
... go with the 100nf tantalum decoupling caps mentioned in the BOM ... -
Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... ts2068 doesn't use resistor decoupling on the data lines to ... -
Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... ts2068 doesn't use resistor decoupling on the data lines to ... -
Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... ts2068 doesn't use resistor decoupling on the data lines to ... -
2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…
... machines do not use resistor decoupling but then they also completely ... -
Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.
... discovered the problem, added an decoupling capacitor inside the RAM expension ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... really make sense unless your decoupling caps are dodgy, which is ...Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... really make sense unless your decoupling caps are dodgy, which is ...External Speccy CommunicationHow does a speccy communicate with the outside world ?? Do you have to have the interface 1 for serial communications ( rs232 ) or are there other p…
... external components (just a crystal, decoupling, magnetics and RJ45 jack) such ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... suggested to me that insufficient decoupling might be a problem, but ... prototype board, adding some more decoupling, but it made no difference ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... suggested to me that insufficient decoupling might be a problem, but ... prototype board, adding some more decoupling, but it made no difference ... if it's just supply decoupling or could it also be ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... if it's just supply decoupling or could it also be ... reckon it's a buffering/decoupling problem and want to see ...Video output (48K)Hello! I've made video mod on my Zx Spectrum. Now the problem of scanning (and tuning) to right channel is history for me. But, now I have another …
Also i have rolling lines on the lower part of the screen. I think is "digital noise", maybe a bad voltage decoupling on the ULA chip. If i have one PERITEL (RGB) adaptator this will help to eliminate faults on PAL encoder chip (LM1889).DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... case, each one has a decoupling cap and a decent ground ...DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... make sure you have adequate decoupling, a good ground path (nice ...DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... and power paths and good decoupling, and it should work. Use ...QL power connector pinoutHi. Can anyone tell what's the pinout of the power connector on a ql and which are the specs of the psu? Pin 2 is gnd, i guess. [URL]http://img230…
... chips did not have any decoupling capacitors on the board :-oGiving up the internet for a whileInspired by a friend doing the same recently, I've decided to take a break from recreational internet usage for a while. I'm allowing myself to use e…
... with regards my shock about decoupling capacitors being retro fitted to ...Giving up the internet for a whileInspired by a friend doing the same recently, I've decided to take a break from recreational internet usage for a while. I'm allowing myself to use e…
... with regards my shock about decoupling capacitors being retro fitted to ...Spectrum Analog interfaceHello Spectrum addicts, Feels good to join you :) I'm trying to build an analog joystick interface for our beloved machine. I've set up a page here:…
... a couple of low ESR decoupling caps in parallel will mitigate ...Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
... loaded quite a bit - the decoupling capacitors are supposed to stop ...
