https://www.youtube.com/watch?v=o8o9aIlMnxI
This is the 2nd vid showing the pulse, which by itself sounds awesome but not sure how well the the PW pot works, it just goes quiet after I turn the dial pa

https://electro-music.com/forum/viewtopic.php?p=443843
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https://www.schmitzbits.de/vco4069.html
A schmitt trigger is a circuit that sets when a high voltage is present, it fires. The circuit remains set until a much lower voltage is presented at the input. When the schmitt trigger is fired it discharges the integration capacitor thru the diode and the cycle can start again. At the output of the integrator there is a sawtooth waveform

https://www.youtube.com/watch?v=T4bYt04LD9o
This is my build of the Rene Schmitz VCO.. Though not sure if its quite right.. low seems to low and high doesn't seem high enough :

https://electro-music.com/forum/post-443239.html
Rene Schmitz 4069 VCO : Page 1 of 3 [54 Posts] View unread posts View new posts in the last week Mark the topic unread :: View previous topic:: View next topic Goto page: 1, 2, 3 Next: Author Message; crazeydazey Joined: Feb 15, 2007 Posts: 303 Location: England Audio files: 4:

https://electro-music.com/event2008/forum/topic-53285-0.html
Posted: Wed Apr 25, 2012 8:40 am Post subject: rene schmitz 4069 VCO : Hi all, I'm half way through knocking this up on pref board and had to stop because I'm missing a few resistors although I do have 5% (I was gonna do it all in 1% resistors)

https://www.reddit.com/r/synthdiy/comments/mii5h3/rene_schmidtz_4069_vco_tracking_test/
it would even work with onboard sound, you probably need to send it through a voltage divider or potentiometer. to get it to line level. (around 1V) some pcs even with just one "audio out" jack can be configured so it becomes a line input. 1.

https://www.reddit.com/r/synthdiy/comments/cey313/could_someone_explain_how_this_extremely_simple/
Rene Schmitz VCO: The integrator basically ramps up the voltage on its output by charging the 2n2 capacitor until the output voltage is high enough to trigger the schmitt trigger, discharging the cap instantly by shortening it out through the diodes, which starts the cylce anew. CV controlls a log current sink, which sets how fast the cap is

https://www.reddit.com/r/synthdiy/comments/cbu6wj/added_sync_to_ren%C3%A9_schmitz_4069_vco_and_its/
Added "sync" to René Schmitz' 4069 VCO and it's awesome. Probably only interesting to beginners like me or people who have breadborded the circuit and want to add sync. My circuit is very crude, if I hadn't run out of space on my PCB I'd have added some sort of schmitt trigger and monostable multivibrator to shape short, sharp trigger pulses

https://www.youtube.com/watch?v=x3iA4BvsGiQ
Breadboarded this simple VCO with +/-12V supply. Frequency range is nice, not sure about 1V/octave tracking. Next step would be to make a pcb for it.

https://modwiggler.com/forum/viewtopic.php?t=241487
I've found the Rene Schmitz 4069 to be a cheap model system. It's a schmitt trigger and inverter, flipping an integrator cap; so we get a sawtooth by pushing constant (calibrated) current into the system. It was modified and made into a video walkthrough by Moritz Klein. Very helpful for newbies. Screenshot attached from his video showing my

https://www.reddit.com/r/synthdiy/comments/lgf537/finished_my_first_module_ren%C3%A9_schmitz_4069_vco/
berrmal64 • 3 yr. ago. I made that same module a couple years ago, it was my first VCO too. I ended up putting thermal paste between the flat faces of the exponential converter transistors, and zip tying them togethere, and I can generally get about 3 octaves of acceptable linearity out of it (although I haven't messed with it in a while).

https://electro-music.com/forum/topic-60189-25.html&postdays=0
4069 Rene's VCO : Moderators: jksuperstar, Scott Stites, Uncle Krunkus Page 2 of 3 [52 Posts] View unread posts ... Message; rene_schmitz Joined: Oct 27, 2013 Posts: 16 Location: germany: Posted: Fri Nov 08, 2013 4:34 am Post subject: isak wrote: 1. why R27 is a Pot? is it for the amount of the sync? 2. Can I use the sync parts as is in the

https://www.charlielamm.com/gear/vcf/index.php
Rene Schmitz MS20 VCF EMF6c Diode VCF 4069 "Hammer Cocktail" VCF ... RENE SCHMITZ MS20 VCF. For those new to the synth world (or perhaps born after 1990?) the Korg MS20 filter is well known for its distorted "Peak". ... Part II, where I finish Gasboss' filter, make it a skiff, as well the stock 2720 modded for 15V is here. Sound clip is here

https://electro-music.com/forum/topic-71511-25.html
Rene Schmitz 4069 VCO : Page 2 of 3 [55 Posts] View unread posts View new posts in the last week Mark the topic unread :: View previous topic:: View next topic Goto page: Previous 1, 2, 3 Next: Author Message; crazeydazey Joined: Feb 15, 2007 Posts: 303 Location: England Audio files: 4:

https://files.electro-music.com/forum/topic-72286-0.html&postdays=0&postorder=asc&highlight=
I have been playing around breadboarding Rene Schmitz 4069 VCO (I already have one built, love it, nice simple little VCO), then my plan was to mess around with it and alter bits and learn how and why it works. ... I have got rid of the pulse and made 2 saws which I had hoped to be able to detune and mix together to make a nice beefy sound, but

https://www.reddit.com/r/synthdiy/comments/m28dbz/ren%C3%A9_schmitz_4069_vco_problems/
44K subscribers in the synthdiy community. building, modifying and repairing synthesizers

https://electro-music.com/wiki/pmwiki.php?n=Schematics.VCO4069ByReneSchmitz
Schematics. / VCO 4069 By Rene Schmitz. The circuit presented here is aimed towards simplicity and ease of construction. It can be an addition to a modular system, used in a standalone fashion or as a test oscillator for your bench. I found it interesting to use the gates of a 4069 CMOS inverter instead of opamps. Sort of a VCO complement to

https://electro-music.com/forum/topic-71511-50.html
Rene Schmitz 4069 VCO : Page 3 of 3 [54 Posts] View unread posts View new posts in the last week ... Joined: Jun 11, 2020 Posts: 36 Location: Germany: Posted: Sun Nov 15, 2020 2:04 pm Post subject: This post might even be relevant to appear in the general DIY board since I suspect many people to be interested in RS works, right? P.S.: I couldn

https://modwiggler.com/forum/viewtopic.php?t=60720
You can also build simple square/pulse VCOs using 555/7555s, or 4093/40106 as astables, if you need something REALLY simple. (I'm not sure about exponential conversion for something like these though.)

https://electro-music.com/event2008/forum/ptopic-47351.html
Posted: Thu Apr 14, 2011 7:36 am Post subject: problems with renè schmitz 4069 : hi to everybody i've build the 4069vco from renè schmitz and it was working then after some months i finally decide to mount it on a panel so i desoldered pots and jacks and placed them in a better way to fit the holes but when i powered the module(+-12v