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Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…
... circuitry by a complete quartz oscillator block of 17 MHz.[/QUOTE ... know this problem from the oscillator of the MB02+IDE (same ... -
Greetings from San FransiscoWell, I'm here in San Fransisco staying at a money trap of a hotel.:-x Ooh how the other half live. :p I'm staying in Readwood. Well I have not h…
... with the creation of an oscillator.
I'll upload ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... /> I don't have an oscillator.
I have read ... -
Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…
... , or perhaps even a Xtal oscillator not working. Is it possible ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
Yes, basically the whole oscillator / coil / charge pump section (shown ... -
CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky
... is enough, any other crystal oscillator will do, really. But in ... -
LCD VS Spectrum +2A/B+/+ RGBWhat is the problem with LCDs and spectruns? I've had no problem connecting RGB leads getting an excellent picture on crt's but, why the heck LCDs w…
... for resetting the vertical sweep oscillator of analogue tvs but perhaps ... -
Mum looking over your shoulderWhilst paying a visit to my flat once, my dear old Mum came up behind me whilst I was copying some files from +D disk to a cassette for a friend. I w…
... the TV sets intermediate frequency oscillator. This will create a buzzing ... -
Mum looking over your shoulderWhilst paying a visit to my flat once, my dear old Mum came up behind me whilst I was copying some files from +D disk to a cassette for a friend. I w…
... , by knowing where the local oscillator is tuned to they know ... given the frequency of the oscillator
it is digital ... in radiates it's local oscillator out on the aerial -
Mum looking over your shoulderWhilst paying a visit to my flat once, my dear old Mum came up behind me whilst I was copying some files from +D disk to a cassette for a friend. I w…
... , by knowing where the local oscillator is tuned to they know ... given the frequency of the oscillator
it is digital ... in radiates it's local oscillator out on the aerial[/QUOTE ... -
Mum looking over your shoulderWhilst paying a visit to my flat once, my dear old Mum came up behind me whilst I was copying some files from +D disk to a cassette for a friend. I w…
... the aerial from the local oscillator then they can tell what ... -
Mum looking over your shoulderWhilst paying a visit to my flat once, my dear old Mum came up behind me whilst I was copying some files from +D disk to a cassette for a friend. I w…
... the aerial from the local oscillator then they can tell what ... -
So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…
... a free running 20MHz crystal oscillator, and let the output side ... -
I hit an electronic jackpot!!!Hi everyone, My computer project can exceed faster than ever!! My school has no electronic or computer teachers so they have thousands of chips and …
... , and some sort of crystal oscillator.
you can go ... -
Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
If this is the crystal marked with X1 on the schematic, then it's using only 2 of the pins.
However, this seems to be the main oscillator for the ZX81 CPU and ULA. -
Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
An oscillator (the circuit that generates z80 ... -
Should this be connected?[IMG][URL=http://img528.imageshack.us/i/img7396m.jpg/][IMG]http://img528.imageshack.us/img528/6470/img7396m.th.jpg[/IMG][/URL] Uploaded with [URL=htt…
... in the path of the oscillator-signal that is taken out ... is to "clean up" the oscillator-signals (remove unwanted harmonic frequencies ... -
Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
... suchlike.
Since the oscillator circuit is part of the ... -
Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
... you could put together Xtal oscillator using an ordinary circuit (74HC ... , and disconnect the other ULA oscillator (output) pin.
But ... -
Issue 2 Speccy faultHi Guys, I'm really hoping someone can help me with a fault that has just developed on my issue 2 speccy. After perservering for some time with usi…
... the edge connector and an oscillator in the circuit is extremely ... -
Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…
... use an LS part in oscillator circuit... if you want to ... 74HCU04 which is suitable for oscillator circuits but not very fast ... improve operation / reliability of the oscillator. -
Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…
... use an LS part in oscillator circuit... if you want to ... should 7404 work in this oscillator circuit? I'll maybe have ... -
128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... out what has bugged speccy. Oscillator block hex inverter was completely ... -
Issue2 troublesHi! I have a 48k Speccy Issue 2 which has trouble with displaying colour. It did have a broken LM1889 chip (it didn't display the blue component of …
... any tuning components in the oscillator circuitry. If not, it may ... ]passive[/I] components in that oscillator. Usually just a Xtal, some ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... am assuming based on an AD724 or AD725 chip) will certainly ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... am assuming based on an AD724 or AD725 chip) will certainly ... -
RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... RGB to Composite by using AD724. I plan to use this ... -
RGB to S-Video and Composite Adapterif I produced a dongle that generated composite and s-video from the RGB socket on +3 and Black +2 spectrums would anyone be interested? I'm thinkin…
... RGB to Composite by using AD724. I plan to use this ... -
ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …
... version, that mounts a 14MHz oscillator and where the Z80 clock ... -
Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
Just thinking: when so much power is leaking away that the voltage swing is too low (say a defect winding), then the oscillator will work to the max to restore the correct output. This then must result in a very hot Tr4.
