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Kempston problemsI built a kempston interface a while ago, and it works well, but suddenly, when I load sabre wulf, select kempston interface, the fire button seems t…
... is somehow connected to the capacitor inside the spectrum that keeps ... -
Scratchy video after composite modIve re done the mod several times on this Issue 4B with the exact same results, anyone know whats up? Caps maybe? [youtube]fa1wk_epgjE[/youtube]
... caused by a failed filter capacitor) or perhaps a problem like ... -
Noisy PSUI recently picked up a 48k Speccy from eBay. It works fine but the PSU seems a little on the noisy side. I remember my old one gently humming back in…
... psu is the large filter capacitor which had simply become dry ... -
Issue 4S Schematics and DC-DC circuitA while ago I bought a Spectrum 4S that had problems tuning. I removed the RF tuner as I was not going to use it and did the composite mod. It worked…
... some 'flying' components - usually a capacitor and/or diodes. -
'Jumping' Composite Video Output on +2bNot having much luck recently... I have converted my +2b to composite out using the info contained [URL="http://www.secarica.ro/html/plus3_hardware.…
... is avoided by removing the capacitor that mixes the audio signal ... -
Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…
... emitter follower circuit, and a capacitor on the input to block ... -
ZX81 back porch fix using LM1881Hello! Has anyone here did the back porch fix for ZX81 using LM1881? I did it this weekend and instead of clear black on white i got black on dark g…
... use AC coupling through a capacitor (10u would find). What's ... -
Bad signal on my ZX Spectrum+ 48kHi there... I just got my very first Spectrum, after search high and low for quiet some time :) But unfortunately, when I plug it in my tv, I don't …
The TV will have DC blocking on the input anyway so the capacitor is unnecessary. Just a simple bit of wire is fine -
48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…
... years.
A bad electrolytic capacitor.
Power supply circuitry becoming ... -
48K+ losing horizontal syncHello! I've got this 48K plus in perfect cosmetic condition and it works well except for when it gets a tad bit warmer the image rolls around. That w…
... years.
A bad electrolytic capacitor.
Power supply circuitry becoming ... -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
Thats because they degrade with time. And the reset circuit is controlled by a electrolyte capacitor (amongst other things). Check the schematic for your ZX model. -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
... is controlled by a electrolyte capacitor (amongst other things). Check the ... -
Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
... from experience that the 1uF capacitor on the reset circuit in ... -
(Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…
... fairly easy: using a decoupling capacitor and load resistor to pull ... the capacitor load to zero when there ... signal stable, I use another capacitor.
After that, I have ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... the blue 0.47?F capacitor is soldered to. You can ... -
Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…
... other than replace a bad capacitor or re-solder a loose ... -
Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…
... say for sure that a capacitor is bad just by looking ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... then I added an electrolytic capacitor of 150 ?F (you can ... correct this I added a capacitor of 560 pF from emitter ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
... a warm or deformed electrolytic capacitor change it.
Ingo ...Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…
... -5V. If there is a capacitor with low resistance your next ...Just bought a Spectrum+. Doesn't work. Red bars on screen.Hi all, Something of a noob here. Having recently been on holiday, I came across a Spectrum+ in a box, with a collection of games in a shop, and, af…
... . It might happen that the capacitor responsbible of generating the reset ...strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... myself had to add a capacitor of 33 ... 47 pF between ... the PCB I added a capacitor of 100 pF to ground ...strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... 'll check what placing the capacitor between pin1 and 7 does ...strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... .
I tried the capacitor that you suggested, but it ...Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
... /> Also the value of the capacitor can affect the frequency, as ...Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
It wasn't that one 1uF capacitor. I haven't radial caps left to replace all, so I started checking RAMs and guess what.... they were all checked ok so far. Will keep looking and update everyone as I go. Ordering some caps.Faulty 128K toastrack keeps resettingHi. I have this toastrack which worked nicely for let's say 40 minutes and then a weird fault showed up. It keeps resetting over and over, sometimes…
... .
If the suspect capacitor is electrolytic and it is ...
