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Items for modifying Spectrum PCBs..
Click on the product thumbnail for an enlarged view.
A 100uf Capacitor
A capacitor suitable for making the composite video mod on ZX Spectrums
Please see this article for details.
Axial Electrolytic Capacitors For ZX Spectrum / Composite Video Mod Kit
A set of replacement electrolytic capacitors for the Spectrum 16 / 48 / 48+ (motherboard versions from 2 to 6A) and components for applying the optional composite video modification.
For ease of fitting, these capacitors are axial types (ie: they have a lead coming from each end) - the same format as those originally fitted to the PCB.
The exact number of capacitors required varies across the PCB revisions but there will be enough here for all types. Printed fitting notes are included.
The kit also includes the following components which can be used to modify the Spectrum's video output to give a composite video signal for a much improved picture:
* Both video mods give a composite signal from the standard Spectrum video connector, which is much improved over RF (with care, the mod can be easily reversed). The transistor version produces a brighter picture and buffers the output from the Spectrum video circuit, however, it may not work on all TVs. The passive (capacitor) mod is simpler and should work with all TVs but the picture is generally not as bright. Fitting instructions for both are included.
A general purpose NPN transistor that can be used to make an alternative version of composite video mod on the Spectrum. Using a transistor instead of a simple wire or capacitor provides a stronger signal, usually giving a brighter picture. It also buffers the Spectrum's video circuitry so much of the load is taken by this transistor. However, it may not be compatible with modern LCD TVs.
Transistor video mod connections:
Please see this article for details.
De-solder Braid / Wick (0.5 Metres)
Small Tube Of Thermally Conductive Adhesive
Heatsink for 40 Pin DIL ICs
Heatsink suitable for 40 PIN Chips such as the CPU in the Commodore 64 and ULA in Spectrum Plus. (Note: There is not enough room for it in the rubber-keyed Spectrum unless you desolder the ULA's IC socket and fit the ULA directly onto the motherboard.) Can also be used on the shorter SID and PLA chips if you dont mind the heatsink overhanging (it could be cut down of course).
Dimensions: 51mm x 19mm x 4.8mm
Attachment methods: The heatsink is not self-adhesive - it requires either a thermal adhesive pad or thermally conductive glue which I sell separately - please see my listings nearby.
An original internal reset switch for Spectrum+ (used)
RAM Upgrade Kit for 16K ZX Spectrum (to 48K)
.. new support logic chips for the upper RAM:
.. and wire links / solder, and printed instructions.
Fitting is usually just a case of inserting the chips into the empty sockets on the motherboard and soldering a couple of wire links across the appropriate pads on the PCB. Almost all 16K models can be upgraded but there are some very early (Issue One) Spectrums that have no space on the PCB for more memory.
RAM Upgrade Kit for 16K ZX Spectrum (to 48K) PCB Version.
This version of the Spectrum RAM upgrade kit offers a cheaper, modern alternative to using individual DRAM chips. A small custom daughterboard PCB with a low power SRAM IC is simply pressed into the RAM IC sockets.
The kit also contains the 4 support logic chips which must be fitted at positions IC23-26 (IE: 2 x 74HCT157, 1 x 74HCT32 and1 x 74HCT00). A couple of wire links may also need to be soldered between the appropriate pads located on the PCB - full fitting instructions are provided.
Please check your Spectrum can be actually upgraded! Almost all 16K models can but there are some very early Spectrums that have no space on the PCB for more memory.
Click here for fitting instructions (printed version also included in kit)
If you don't require the support logic, the board is usually available on its own - see below.
Radial electrolytic capacitors for Spectrum 48 / Composite mod kit
Good brand (Panasonic etc), long life capacitors suitable for re-capping a ZX Spectrum 48K.
These are radial type capacitors (which have both leads coming from the same end) so one wire has to be bent over the body of the capacitor when fitting - see this photo for example. Please see my other Spectrum capacitor set for axial types.
The pack comprises:
And also includes the following components for applying the composite video modification if desired.
Printed instructions are included.
3 Metres of flux-cored 60/40 tin-lead solder
Good quality, 0.7mm diameter - ideal for fine electronics work.
Lower RAM replacement board for ZX Spectrum
A PCB module designed to replace (all 8) of the 4116 ICs used for the lower 16KB of RAM in the Spectrum.
Upper RAM replacement board for ZX Spectrum
A PCB module designed to replace (all 8) of the 4532 ICs used for the upper 32KB of RAM in the Spectrum.
Please note: If you need to upgrade a 16KB machine with this board, please purchase the version with the support logic chips.
MuRata Switch Mode 5v Regulator (replaces 7805)
A direct replacement for the cheap but inefficient 7805 found in the Spectrum. A high-efficiency switch mode regulator so wastes very little power as heat (the Spectrum's heatsink is completely removed when this device is fitted!)