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Bank Holiday Alert: Monday 26th August is a bank holiday here so my next dispatch date will be the day after (Tuesday 27th) Cheers, Phil
Items for modifying Spectrum PCBs..
Click on the product thumbnail for an enlarged view.
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:
Note: two BC549s can be used to replace TR1 and TR2 to give a brighter picture (though they must be fitted rotated 180' compared to the silk screen legend). Please see this article for details.
Black Axial Capacitors For ZX Spectrum / Composite Video Mod Kit
A 100uf Capacitor
A capacitor suitable for making the composite video mod on ZX Spectrums
Please see this article for details.
De-solder Braid / Wick (0.5 Metres)
Small Tube Of Thermally Conductive Adhesive
Heatsink for 40 Pin DIL Chips - Bare
Heatsink for 40 Pin DIL Chips - Self Adhesive
An original internal reset switch for Spectrum+ (used)
10 x small isopropyl alcohol wipes
RAM Upgrade Kit for 16K ZX Spectrum (to 48K)
.. brand 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.
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!)