You can also make a VCO with that, use 5 of the gates in a ring oscillator, and the sixth as a buffer, and feed Vcc in as a variable voltage, so you can adjust the output frequency. Not too stable, but, with a PLL, it works well to make a multi megahertz oscillator, though frequency depends on the actual logic family used, along with the manufacturer of the specific IC. Second package acting as buffer to get a logic level output might be needed, along with a pull up resistor, to get a reliable logic level at the lower end of the control voltage range as well.
So you can actually take both outputs and mix them if you use a pair of buffer stages and adjust for the level discrepancy between the two, I imagine. Could be quite handy for a simple LFO generator.
In the east, even schmitt trigger ICs were a problem :D Only I can recall being made were 74132. Oscillators were mostly built with 7400/7404 and those were pretty picky oscillators...
Interesting video, but some of those TTL circuits are getting hard to find these days. So, I have wonder if you couldn't much of same effect using op-amp or comparator.
Наука
You can also make a VCO with that, use 5 of the gates in a ring oscillator, and the sixth as a buffer, and feed Vcc in as a variable voltage, so you can adjust the output frequency. Not too stable, but, with a PLL, it works well to make a multi megahertz oscillator, though frequency depends on the actual logic family used, along with the manufacturer of the specific IC. Second package acting as buffer to get a logic level output might be needed, along with a pull up resistor, to get a reliable logic level at the lower end of the control voltage range as well.
Ring oscillators are fun to play with.
My favorite is to build this with the CD4093 CMOS NAND- then the oscillator is gate-able and much fun can be had!
Quick and nice demonstration of an Oscillator using the Hysteresis property shown in the previous video !
Ha! Nice label on the scope. I’ve got the same “upgrade”
When I was a kid I used this type of oscillator for my VDU project because I couldn’t afford to buy a crystal.
So you can actually take both outputs and mix them if you use a pair of buffer stages and adjust for the level discrepancy between the two, I imagine. Could be quite handy for a simple LFO generator.
Cool. And useful.
Merci!
My first clock circuitry , thats how hard was to find cristals for sale here in east -europe.
In the east, even schmitt trigger ICs were a problem :D Only I can recall being made were 74132. Oscillators were mostly built with 7400/7404 and those were pretty picky oscillators...
Nice
Fun!
Hi, how can I use this same oscillator but using a 4MHz quartz crystal?
ruclips.net/video/FExN8ZaufCI/видео.htmlsi=bUbI_4KhZiopmwzV
Interesting video, but some of those TTL circuits are getting hard to find these days. So, I have wonder if you couldn't much of same effect using op-amp or comparator.
yes of course. there are many circuits to choose from
74HC series is not that hard to find, but the 74 series has been limited just to some popular gates, counters, FFs, latches...
What about CMOS 40106 and 4584?
Thanks
yes, those do the same thing
Is the pin function similar to cd40106?
Same
👍👍
Oscillating frequency: f=1/2.2RC
Chatgpt gives different formulas and different results of frequency
It's 0.69 not 2.2