20 LED versions

In this design the effect is of a pair of LEDs moving away from each other, (DOT mode), or, if using BAR mode, a row of LEDs expanding outwards away from each other.

HDD Activity Meter 20 LED Versions


Parts List with order codes for UK and US suppliers
HDD Activity Meter 20 LED Versions


20 individual LED version

As in all the board designs for the HDD meter, R3 is fitted in its alternate position and VR1 is replaced with a wire link. There is a total of three links on this board.


HDD Activity Meter 20 LED Versions
Component layout - top view.



HDD Activity Meter 20 LED Versions
Track layout - Viewed from above.


HDD Activity Meter 20 LED Versions
The finished board.


The PCB layout if using two 10 LED arrays

Again three links are used here.


HDD Activity Meter 20 LED Versions HDD Activity Meter 20 LED Versions
Component layout - top view (left) and Track layout - Viewed from above (right)


HDD Activity Meter 20 LED Versions
The finished board.


HDD Activity Meter 20 LED Versions
Wiring detail between the LED arrays viewed from above.
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