ZX Spectrim 128 +3 composite video output and drive belt replacement

Did some work on ZX Spectrum 128 +3 I have. One thing was I wanted to make it work with small “TFT Color monitor” (for a car rear view). This monitor has a composite video input.

First I tried using CSYNK and GND signals for a composite video input. You get the video but it was terrible quality. It seems that “The 128 ZX Spectrums including the +3 (and +2A, +2B) have audio sound modulated onto the video, which reduces the clarity of the composite signal that is available at the modulator input.”(1).

Then I found this document – “Video fixes and video cables
for all ZX Spectrum 128K models”. There is a chapter on Creating composite video-out on a +2A / +2B / +3:

“Although the ZX Spectrum 128K heat sink model and the grey ZX Spectrum +2 have a composite video-out signal on pin 1 of the RGB connector, the ZX Spectrum +2A, +2B and +3 are missing this feature.
Instead of the composite video signal they have a dangerous 12V on pin 1 that will seriously damage your TV or monitor!
But you can add the composite video signal yourself, with the same fairly simple circuit as that is integrated on the heat sink model and +2.
The steps:
1. First remove the 12V from pin 1 by removing resistor R44 (should be the same for +2A, +2B and +3, and very close to the RGB connector).
2. Add this circuit:”

zx spectrum +3 composite video mod
zx spectrum +3 composite video mod

 

zx-spectrum-rgb-pinout
zx-spectrum-rgb-pinout
Perfect packaging :)
Perfect packaging 🙂

And here is the result:

zx spectrum +3 composite video mod
zx spectrum +3 composite video mod

 

 

Result
Result

 

 

The Shallows: What the Internet Is Doing to Our Brains

The Shallows: What the Internet Is Doing to Our Brains
The Shallows: What the Internet Is Doing to Our Brains

Recently have finished this book. From the times of Plato and Aristotle our brain and way of thinking is changing and adapting to our way of living. Every tool we use becomes a part of us, but also we become a part of a tool we use. Clock, written word, computers, world wide web. Everything we use changes us, changes how we think, changes how we remember things.

Its a good read that raises a lot of interesting topics.

Replacing MasterFan MF120L with an beQuiet Silent Wings 3 fans

Recently was playing with the fan configurations to make my PC super quiet on idle. Noticed that biggest rattling sound comes from Master Liquid radiator fans even on low RPM.

Decided to change them.

Some googling led me to beQuiet Silent Wings 3 fans –

  • Virtually inaudible operation at max. 15.5dB(A)
  • 6-pole fan motor for less power consumption and vibration
  • Fluid-dynamic bearing enables super-long life span of 300,000h
  • Fan frame with funnel-shaped air inlets for extremely high air pressure

After replacement, You can instantly tell than Master Wings 3 are almost inaudible comparing to stock Master Fan MF120L. And MF120L is just a garbage with an RGB led on it.

Silent Wings 3
Silent Wings 3
Silent Wings 3 on a Master Cooler
Silent Wings 3 on a Master Cooler
Silent Wings 3 on a Master Cooler
Silent Wings 3 on a Master Cooler