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:
– for 10V:
– for 15V:

After that, we can see dutty factor (fu) is about 50%.
Frequency f=k*R*C, so:

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:
– 1nF:
– 10nF:
– 100nF:
– 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:

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  4. So I thought it might be fun to share alittle of my knowledge of the CMOS basics and hopefully you will learn something and will be able to experiment with your own CMOS based circuits.

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