The SKTGen is a stand-alone test signal generator using a pic16f84
(STKGEN version 7.2) or pic16f628 (STKGEN version 7.5) microcontroller.
SKTGen stands for "Simpele Kleuren Testbeeld Generator", which is
Dutch for Simple Colour Testpicture Generator.
IW2KGH made the original (black & white) "MONO2",
who got it from Alain Fort's "PICDREAM".
The idea to get some colour in this tiny test generator came with some quiet
moments on the toilet.
The videosignal was originally composed from 4 ports, 1 for synchronisation and 3
for different gray-values.
By putting those 4 signals in an IC that makes composite video out of RGB and
sync, the colour video test generator was born.
For change the call identifier and scrolling text, there is a program CHANGETEXT
(for STKGEN v7.5 and newer). For older versions, you must use a text-editor and
compiler.
What do you need to build the SKTGen ?
- A pic-programmer.
- A PCB
- And of course the components:
IC4 1 pic16f84 (v7.2) C22,C23,C24 3 82 pF IC4 1 pic16f628 (v7.5) C5 1 56 pF IC3 1 mc1377p C11,C13,C21 3 1 nF P1,P2,P3,P4,P5 5 pot 10 k C4,C17 2 220 pF D1,D2,D3 3 1n4148 C6,C7 2 22 pF X1 1 4,4336 MHz crystal C12 1 27 pF X2 1 8 MHz crystal C10 1 4-22 pF trimmer IC2 1 78L12 C16 1 10 nF IC1 1 78L05 C25 1 15 pF C20 1 22 uF - 16 volt R1 1 47 k C1,C2,C3 3 15 uF - 16 volt R2,R5,R6 3 1 k C14,C15,C19 3 100 nF R3 1 4k7 C8,C9,C18 3 220 nF R4 1 75 ohm