Experiments with CMOS 4093 chip


original article (roumanian language)

    
Usually, for made a simple square wave generator it use old 555 (you can see my experiments with 555 at Experimente cu “batranul” 555).
I like more CMOS chips… so, I use 4093 series (CD4093, MMC4093, etc) who is Quad 2-Input NAND Schmitt Trigger (see datasheet).
    
I use schematic for gatted oscillator:
gatted oscillator with 4093
A funny montage is same police lights:
gatted oscillator with 4093
    
I use Livewire software for simulate this schematic and I made 2 movies:
original police flasher only CMOS 4093:

police flasher only CMOS 4093 – logical views

    
Initial schematic has formulas for calculate times.. imposible formulas at first view, but if study datasheet, we can calculate values.
    
I calculate times for three value of power suplly:
– for 5V:
5V
– for 10V:
10V
– for 15V:
15V
    
After that, we can see dutty factor (fu) is about 50%.
Frequency f=k*R*C, so:
k
    
Recomadated values are:
ok values
    
For minumum recomandated value for resistor:
r minim
    
For maxim value of resistor:
maximum resistor
    
Theoretical frequency is from 1Hz to 234kHz.
    
Practical schematic is:
practical schematic
    
If change just capaciter:
– 100pF:
100pF
– 1nF:
1nF
– 10nF:
10nF
– 100nF:
100nF
– 1uF:
1uF
    
I made a new simulation with Livewire software and new movies:
simulare functionare oscilator cu poarta CMOS 4093

oscilator cu poarta CMOS 4093 part2

    
I found on Minimaxfly channel on youtube a movie named Signal lumineux de Police Flasher CMOS 4093 Electronique who use my schematic: