Schmitt Trigger NAND Gate Oscillator

Design and demo of an RC oscillator based on a CD4093 quad Schmitt trigger NAND gate. Includes schematic and scope shots.
Network XIII: Electronics projects, demos, builds and teardowns for hobbyists and makers. All are welcome.

[@mad_circuits]

Best explanation of Schmitt Trigger Oscillators on UA-cam. Great! Keep going!

[@NetworkXIII]

Thank you !

[@bjornvanderlande7491]

This explanation is brilliant, a shame so few people have seen this

[@NetworkXIII]

bjorn van der lande Thank you for your kind comment, it is much appreciated.

[@Enigma758]

Just what I was looking for, thanks!

[@oliver197637]

nice!!!!!!!!
thank u so much

[@ChaojianZhang]

This video is underrated.

[@dtrimm1]

Nice video - thanks!

[@ElectroCiencia52]

Great!!!

[@NetworkXIII]

Thank you!

[@6p1p]

The output square wave mark and space doesn't look like same. I'm thinking to get similar chip 74LS132 to make a Scope CRT TV and 2 gate for Sawtooth oscillator for Vertical and horizontal . 2 gate for self oscillate for Inverter for step up to few hudred voltage for CRT , LM1881 for Sync seperator.

[@bhagavathym6933]

Sir, I want 38 Khz frequency oscillator...with 4.42 volts as input voltage..what are the R and C values to be used..and what is the vp and vn values sir..please help me 🥺need it for college project sir

[@NetworkXIII]

The design equation for a CD4093 based astable multivibrator is in the video, and also in the TI datasheet, which is where I found it: www.ti.com/lit/ds/symlink/cd4093b-q1.pdf

[@gunasekaran-op8kn]

please send the datasheet reference link of Schmitt NAND gate where I used SN74LS132 series.

[@NetworkXIII]

guna sekaran plus.google.com/100803071201794456386/posts/gDf6j6Bt8AQ

[@gunasekaran-op8kn]

Network XIII thank you

[@ricomajestic]

Can you still get an oscillator with a regular NAND gate with no Schmitt trigger inputs?

[@NetworkXIII]

Probably, though it wouldn't be as stable or predictable as this circuit.

[@kembocapelsii]

starting to 3 minutes your are talking about charging capacity. But there is no input tension Vin connected anywhere in the circuit. HOW CAN YOU charge this capicitance ,?

[@NetworkXIII]

kembo capelsii The capacitor is charged and discharged through R by the output of the first gate.

[@kembocapelsii]

Thank you Very much for your fast answer. i see, but why the capacitor will discharge by the out 3 when it low, instead of to discharge by the ground. sorry I'm bigger i really want to understand everything ^^

[@NetworkXIII]

Sorry for my late reply. The discharge path for C is through R, then into the output pin which is pulled low to ground, and back to the other side of C.

[@kembocapelsii]

@@NetworkXIII the output when it at low level it's connect to ground right?

[@NetworkXIII]

The lower output FET pulls the pin down to ground.

[@dvgelectrician1605]

Brightness of paper irritating me.