Lunetta Synthesizers #5: Oscillator (40106)
Вставка
- Опубліковано 5 лют 2025
- Say thanks and support me with boba tea at: ko-fi.com/trev...
In this video I show you how to build a simple and quick oscillator with a 40106 Hex Schmitt-Trigger Inverter IC. I also cover the working principle of the design and how to adapt it to your liking. - Наука та технологія
I'm an old synth experimenter who is new to Lunettas. I have seen tons of info out there, but little that explains what is happening and why. That is what I am appreciating so much about your videos! Thank you for taking the time and effort to produce these videos! I look forward to learning more from your channel and may have a few tips to pass on. You might make a really good teacher! Many thanks and keep experimenting and making great videos!
Looks good! Note that the stopper resistor R1 is actually there to stop the oscillators exceeding the power dissipation of each gate and the chip as a whole. Failure to respect the power dissipation shortens the life of the chip and leads to bleed through between oscillators because the frequency changes with the supply voltage and the temperature. So a slow (even subsonic) oscillator that draws a lot of current will cause faster oscillators to vary in tone. You can see this in some Atari Punk Console designs where a couple of LFOs have no output connection. You will also want a current limiting resistor on the output as well especially if you are tying multiple oscillators together to feed the amp.
I think we can agree then that the stopper resistor has two functions of limiting the frequency range and the power dissipation of each logical gate. It's shocking how many 40106 oscillators are out there who disrespect this part of the design. Also I remember the Punk Console to consist of two 555 timers, I'm not sure what the difference exactly will be in terms of power dissipation and its limits. Let's just say that I've witnessed more 555 timers heating up than 40106's. But good call!
I think i remember seeing a saw oscillator that had the resistor replaced with a small diode and there was a resistor connected to the top of the cap, meaning its fully possible to make a multi-wave vco with this thing!
Yes, that's indeed how a 40106 sawtooth oscillator is made. This series ua-cam.com/video/QBatvo8bCa4/v-deo.html explains how to do it that way, including adding the voltage controlled part!
How do you “buffer” an output
Great video. Subscription granted
When you show the potentiometer at 3:25 is that wire labelled "3" necessary? Or can it be removed.
It's not necessarily a label, more an indication of pin number. It was part of the pot symbol in Kicad, the EDA I use to make the schematics in my videos.
Would recommend a specific part for the buffer?
Any general purpose opamp should do
3:28 The file is readable here drive.google.com/file/d/139Toa76t1XmtTrjr_OKxcQcqQlpFXPW3/view?usp=sharing