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TR4 continues blowing up!The TR4 of my Speccy Issue 3 continues burning even after I changed all electrolytic capacitors and the BA157 diode. If these things serve only to h…
... only to have -5V and +12V, can I remove all 4116 ... , add 4164 and use a +12V power supply instead of a ... -
48k PSU UpgradeCan anyone give the definitive word on a PSU upgrade (rather than just a replacement) for 48k machines? I'm thinking of adding at least an IDE inter…
... /ATX PSU and regulating the 12v line down to 9v or ... my 7" TFT screen using 12v.
Purchasing a beefy ... -
4116 replaced with 4164 - ProblemsThanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V a…
... other. I have cut the +12V at C44 where it goes ... back, reattaching the -5V and -12V everything work again. So I ... -
4116 replaced with 4164 - ProblemsThanks to Velesoft I have some 4164s, and I have cut the -5V line below R9 where it pass from one side of the PCB to the other. I have cut the +12V a…
... other. I have cut the +12V at C44 where it goes ... back, reattaching the -5V and -12V everything work again. So I ... -
4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…
... to +5V, disconnected -5V and +12V, I have what looks like ... I reattach the -5V and +12V and replace the 4164's ... -
'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.…
... 1k resistor in place between +12v and the collector of the ... -
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…
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I currently have no +12V or -5V from the DC ... -
Need some advice about electronicsI have wired up an ATX power supply to power my spectrums through a DC-DC converter that gives 9V from the +12V rail. It works well. However, I also …
... that gives 9V from the +12V rail. It works well. However ... -
Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…
... plugged the -5V, +5V and +12V direct from the power supply ... -
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 : …
... circuit must be working as +12V is fine, though comparing to ... -
Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…
... .
Shorted M1 with 12V and the 12V circuit broke.
I ... -
Component from a scrap 128K board neededHello, I'm in desperate search of the most left component shown in the following picture. (2115 8617X, probably only the 2115 number has to do with …
... /> Its a combination of a coil and a ceramic capacitor (I ... -
Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…
... , supplied the whole machine with 12v to run the LM1889 and ... -
+3 Floppy drive helpHi guys, I recently found my old spectrum gear and started to see if it all still works, now i had/still have a floppy disk system - Thurnall disk d…
Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…
... that is connected with its coil parallel to the motor. Cut ...+3 stereo mod againIs there a way to get stereo audio without cutting any traces? BTW, I don't understand why two pins are used for +12V on DIN connector. one of those…
Is there a way to get stereo audio without cutting any traces?
BTW, I don't understand why two pins are used for +12V on DIN connector. one of those would be perfect for stereo.+2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…
... with connecting it straight to 12v and making the regulator get ...Speccy PSUI've grabbed a Speccy PSU from fleabay and it looks like a Speccy Plus PSU. After testing it with a multimeter it's kicking out 12V rather than the …
... multimeter it's kicking out 12V rather than the 9V I ...ZX Spectrum Hardware Standards stickyHi I would like to propose that we add a ZX Spectrum Hardware Standards sticky. I should contain all the voltage, current, power and frequencies st…
... range of the +5, -5, +12V of the power supply, power ...48k Issue 4A power supplyHi, I just repaired a 48k Spectrum+ with an Issue 4A board. The computer worked but the picture was mono with bad contrast and bad synchronizing. I …
... /> I found out that the 12V where only 1.7V and ... types and therefore removed the 12V and 5V from the Rams ... . So only the 12V where needed for the color ... capacitor C44 was cut from 12V output of the transverter. After ...another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... the ZX i found that 12V aren't present... the ZTX650 ...Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... right side of zero)
12V pin: -0.001V (that surely ...Spectrum+ Noisey Picture ProblemHi fellow Spec-chums I need your help! I've recently brought a 48K+ Spectrum(issue 6A) that I'm trying to repair. I did all initial tests on it prio…
... read online this was the 12v line that the feeds the ...Yet another glitchy graphics 48kHeyo, I'm new both to the forums (sorry if this is the wrong forum) and to Spectra I'm afraid, picked up a 48k from a steam fair sale thingy (not th…
... . Now it'll turn on, coil hum and spew out some ...Spectrum +3 PSU questionCan I use a +2A/B PSU to power a +3? I noticed the +2 is 12v@200mA and the +3 is 12v@700mA so I thought I'd ask you lot if it will work before I fry…
... /> I noticed the +2 is 12v@200mA and the +3 is ... 12v@700mA so I thought I' ...UPS power supply noise (odd one)I've got an APC Smart-UPS 700 Had it for about three years no problems with it at all. It was 'used' when I got it. Yesterday I powered it down fo…
... tell if it was a coil whine or a bleep, I ... bit too loud for a coil noise, as I say I ...August sales[COLOR="Blue"]I have about everything listed here in stock. But some of it must be made ready (with custom wishes). [B]Buying directly will save you…
... ://benophetinternet.nl/hobby/vanmezelf/sales/coil.jpg[/IMG]
[B]Coils ...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…
... is not getting it's 12V and I suspect if it ... . I thought without it's 12V it would just not function ... area to ensure the -5/12V came up and then proceed ...+3 on GT65I got the green Amstrad monitor GT65 and I was wondering , it can be connected to the spectrum +3, completely (power supply and video)? I saw that th…
