Benjolin like Lunetta scheme

adamon · Posted: Wed Jul 14, 2010 3:46 pm Post subject:

That's some great sounding stuff Tom! Please do post schematics if you can, they would be most appreciated. Also, would you mind explaining the simple transistor envelope a bit?

DGTom · Posted: Thu Jul 15, 2010 6:10 pm Post subject:

adamon, google up the service manual / schematics for the Roland TR-808; its like a lesson in miniaturisation, or, how to squeeze a synth voice into the smallest part count possible. The envelopes for the drums are more or less resistor / capacitors driven by transistors, the VCAs are transistors etc.

kaputtpanzer · Posted: Fri Jul 16, 2010 3:13 am Post subject:

Very nice and mellow sound. Thank you for the advice with the diodes, I will try this later.

tjookum · Posted: Fri Jul 16, 2010 4:12 am Post subject:

very nice DGtom! I love the effect of having chaos mixed with some regularity, it works very well.

electri-fire · Posted: Sat Jul 17, 2010 10:20 am Post subject:

synthmonger · Posted: Mon Jul 19, 2010 1:30 pm Post subject:

Check out my Lunetta 40106 vco I posted in the main thread. You may want to use it for your clocks.

electri-fire · Posted: Wed Aug 11, 2010 11:32 am Post subject:

I have some 4511 7-segment display drivers that I think should be nice random LED or R/2R drivers. While searching I found this by Phobos.

http://phobos.50webs.com/elektroweb/cosmicspacebeeper.html

It's a Rungler. ( this deserves a separate post. I'll do that later)

tjookum · Posted: Wed Aug 11, 2010 1:21 pm Post subject:

thanks for sharing that link thumb up

droffset · Posted: Wed Aug 11, 2010 4:06 pm Post subject:

I haven't had the mental bandwidth to look at this thread and listen to the clips until now. Thanks for sharing these great ideas.

DGTom · Posted: Tue Aug 24, 2010 7:35 pm Post subject:

I recorded some output of my latest havok wave generator, direct from the breadboard to the built in soundcard... its a little screechy, but I figured you guys might dig it Cool

http://dl.dropbox.com/u/252415/havok_waves.mp3

4046 clock with a 4069 VCO. Getting a wide, usefull range out of the 4046 is still abit of a pain, I borrowed (stole) some ideas from Thomas Henry & Rene Schmitz for the VC Clock & VCO section.

Instead of the VCF of the Benjolin I've been messing around with a voltage controlled digital delay with a switched capacitor filter in the feedback loop & modulating the VCO waveform from Ramp to Triangle to Saw.

The Rungler CV is modulating the delay time & the Rungler Bits (from the 4021) are used to control the feedback loop.

In the clip I start with the VCO at clicking speeds & then ramp it right up... I don't really adjust much except for the overall delay time & the feedback level... at the end I push the delay time right to the end of the chips range & it farts out Very Happy

Rykhaard · Joined: Sep 02, 2007 Posts: 1290 Location: Canada

DGTom · Posted: Wed Aug 25, 2010 11:17 pm Post subject:

Thanks

I really like the noise / grit the delay imparts on the high frequencies... my favourite parts of that one are the strange mettalic tones that plonk out now & then.

Another one, more low end this time;

http://dl.dropbox.com/u/252415/havok_drone_.mp3

This time the rungler CV to the slow VCO is off, about 1 min in I turn the feedback from VCO1 (audio rate) into the CV in of VCO2 up so it gets a little quicker.

Lots of feedback & the delay line is modulating itself. I'm also sending the Rungler CV into the audio path which excites the DDL a little & you get those cool clicks.

HexInverter · Joined: Aug 21, 2010 Posts: 338 Location: Canada

tjookum · Posted: Fri Aug 27, 2010 2:07 pm Post subject:

really cool sounds DGTom, been following this with great interest.

Keep up the good work!

Draal · Posted: Fri Aug 27, 2010 5:04 pm Post subject:

Love the sounds! Images of being captured in an alien spacecraft come to mind. Outer Limits man! Very Happy

DGTom · Posted: Sun Aug 29, 2010 1:16 am Post subject:

Thanks guys!!
I got frustrated trying to get a decent triangle wave & frequency range out of the 4046... so at 1am I took everything off the breadboard & started over!

Much happier with the results, a little tweaking of the feedback / filter section is needed, but...

http://dl.dropbox.com/u/252415/Predator_Drone_Pt_2.mp3

as you can hear... it goes from standard PWM type buzzing to OTT feedback mayhem just by turning the feedback / damping pot. You can turn the feedback all the way off for the pure PWM sound or turn the VCOs freq all the way down & have pure waves of feedback noise being controlled by the Rungler. The little "coda" (quick fade to silence & back up for a moment, then silence) at the end is essentially the same pot movement as the first change at the start, great fun!!

DGTom · Posted: Sun Sep 05, 2010 8:18 pm Post subject:

last one... now with a filter built around a third 4069 & a pair of vactrols;

http://dl.dropbox.com/u/252415/4069_Rungler.mp3

I think I'll build a monosynth using just 4069s & call it the SH-4069 Laughing

Dogenigt · Posted: Fri Feb 22, 2013 8:32 am Post subject:

Hey, how's it going with this project?
I am building a semi-modular CMOS synth and want to include a rungler-ish circuit in it.

I thought of having the CLK as an input from anywhere on the synth (40106 oscs, 4040 dividers, 4093/4070 gates, 4046 PLLs and 4049 squared signals)

and then have the data from a triangle wave on 4046 and the R2R/4021 output feed back into the 4046. should just be a simple pseudo-random clock source for patching further around into the other logic ICs.

still a little in doubt about how I should approach this but I think I will hi-jack this thread and post updates on my progress. the main puzzling thing for me atm is how the OP-amp/XOR gates gets integrated into this whole mess...

just got my 4021, 4046, 4049, 4070, 4093, 40106, 4040 shipment home.

Dogenigt · Posted: Sat Apr 06, 2013 6:46 pm Post subject:

I got into building a module based of the 4046-4021 schematic on the first page and I am getting some interesting rungling here! Very Happy

4046-4021-Rungler_02_bassy_largecap.MP3

Description:

Large caps = bassy patterns

Download (listen)

Filename:

4046-4021-Rungler_02_bassy_largecap.MP3

Filesize:

1.37 MB

Downloaded:

2422 Time(s)

4046-4021-Rungler_03_Morsey.WAV

Description:

smaller caps = R2D2 getting a blowjob-ish sounds

Download (listen)

Filename:

4046-4021-Rungler_03_Morsey.WAV

Filesize:

27.6 MB

Downloaded:

2346 Time(s)

RingMad · Posted: Wed Apr 10, 2013 3:43 pm Post subject:

Some pretty cool sounds in there, Dogenigt! I'll put this circuit on my long list of circuits-to-try-one-day....

James.