https://files.electro-music.com/forum/ https://files.electro-music.com/forum/viewtopic.php?p=458763#458763 Thanks for posting (4yrs ago...)!

Thanks to you for posting your comment. I missed this one 4 years ago... :wink: mosc Mon, 25 May 2026 11:39:16 -0700 https://files.electro-music.com/forum/viewtopic.php?p=458654#458654 Apologies for reviving an old thread, but I am interested in using a circuit similar to this to control a Schmitt Trigger oscillator (using 40106, 74XX14, etc.), or perhaps a CD4046 running in the range of 50kHz-6MHz (controlling and old DRAM-based 1- ... paraparabolic Wed, 06 May 2026 09:06:24 -0700 https://files.electro-music.com/forum/viewtopic.php?p=458112#458112 I don't see the center pins on the pots connected to anything. Of course, if you just use the outside pins you just have a non-variable resistor. mosc Sat, 24 Jan 2026 14:16:59 -0700 https://files.electro-music.com/forum/viewtopic.php?p=458055#458055 Well, hi, nice! Blue hell, too!
:)
but where
Not where it was in the past :shock:

I just started thinking about this circuit, because only now (I think) I have understood it fully and think it is very cool :D
I am playing around a littl ... L´Andratté Tue, 06 Jan 2026 13:45:57 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457956#457956 I guess all of us Lunettics have built circuits with the standard RC Schmitt trigger oscillator consisting of a resistor, capacitor, and a Schmitt trigger inverter IC (ST).
It's a beautifuly simple circuit, but has some drawbacks :

1) tuning
if ... elektrouwe Mon, 22 Dec 2025 16:08:11 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457812#457812 Hello, I already had a lot of fun with it :) Ruebezahl Wed, 19 Nov 2025 04:05:59 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457339#457339 Another +1 for KiCad. It has a good library and it is pretty easy to create your own symbols and footprints as needed.

The latest version integrates Freerouting in it so if you want to use an autorouter, it is much easier now than it used to be. kkissinger Mon, 21 Jul 2025 17:43:53 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457227#457227 Right, the 4017 reset is an input so if you don't connect anything then the PLL is floating. What I do to get a sound is connect some output of the 4017 to the reset pin with a dupont cable, and then it starts to sound. lytex Tue, 24 Jun 2025 13:04:53 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457045#457045 I was aware that in the 555 astable, duty cycle and frequency were interdependent. But I ran through a couple of calculators I found online (DigiKey and some other places have them), and for the audible range, the duty cycles were all around 40-60%. ... Dr. K Wed, 07 May 2025 14:07:32 -0700 https://files.electro-music.com/forum/viewtopic.php?p=457033#457033 Best practice is to connect a capacitor say about 100nF close to the supply pins of each ic and a large one (about 100uF) where the power supply enters the board.
You might want to connect a small filter between the power supply and the supply pins t ... Grumble Tue, 06 May 2025 02:50:03 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456965#456965 Oh! You are right. Maybe there is another CMOS chip with an odd pinout. Cynosure Fri, 25 Apr 2025 21:18:10 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456949#456949 You could wire up a pot as a voltage divider and mix that with the CV from the sequencer. That way you can set the base frequency, and the sequencer's CV will be added to that. Cynosure Wed, 23 Apr 2025 06:33:28 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456942#456942 If you go here:
https://www.falstad.com/circuit/circuitjs.html
You can build circuits and test them out, so you can play with resistor values etc.
That said: The attennuverter is a very smart circuit, with the potmeter you can change the gain from ... Grumble Sun, 20 Apr 2025 11:55:41 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456835#456835 O I can mansplain .. cool :lol:
Thank you for the explanation :) Cynosure Mon, 07 Apr 2025 06:28:49 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456808#456808
Also schematics that look like other things similar to those AI generated QR codes or in different art styles like baroque or cubism.
That could also be fun to use for PCB layouts.

That's a facinating idea. "give me a PCB layout for a Lunetta ... mosc Fri, 04 Apr 2025 13:49:15 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456746#456746 [quote="zaphod betamax"]Have not seen you here in a while!

I have been busy lately (lots going on in my life right now). Things are starting to settle down a bit though. I downsized my studio and I am working on setting it up again. I hope to get b ... Cynosure Mon, 31 Mar 2025 11:28:29 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456579#456579 I've been trying to work out how to drive 2 of 3 different 555 control voltages from the same sourece. From the same sequencer, or as in the attached, from the same modulating frequency in a dub siren.

The dub siren circuit is the upper part--thei ... Dr. K Mon, 17 Mar 2025 15:01:24 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456570#456570 consider the following:

The NAND drone circuit has 3 signals coming out of the NAND gates that are mixed together.

If you use diodes for this you are creating a logic OR gate* and if at least one of the signals is high the output will be high. H ... phobos Sat, 15 Mar 2025 12:24:01 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456562#456562 I dug out ny old dub siren, and realized it has an op amp stage between the modulator (the first stage) and the cv input of the next stage. This weekend I want ro give that a try--run the sequencer output to separate pots, then through op amp (or may ... Dr. K Thu, 13 Mar 2025 13:23:00 -0700 https://files.electro-music.com/forum/viewtopic.php?p=456362#456362 ...[]If anyone reads this who can get my ideas to the persons in charge[...]

:lol: hi!

So erm .. what would be the way to do this .. at the very least there would have to be .. hmm .. this should not be discussed here ... lemme make something ... blue hell Tue, 21 Jan 2025 18:22:05 -0700