Spring Tank Reverb Eurorack Prototype Module

Today I am showing my prototype Spring Tank Reverb module. It's a driver for old school spring tanks like those found in vintage mixers and guitar amplifiers. The driver module has controls for Drive, Tone brightness and darkness, wet/dry mix, and an input for sending CVs to control the wet/dry mix. I'm using an envelope for CV, Beatstep Pro for trigger sequencing, and beats are coming from the Future Retro Transient. I also run the signal through my dual channel compressor, using a trick where both channels are cascaded for additional compression. I also briefly punch in some delay from Timefactor. Audio was recorded direct to Tascam through a Mackie mixer. EDIT: I noticed some users are connecting this to things that are not eurorack systems. To assist you w/ your efforts here are the active pins on the power input.

Spring Tank Reverb Breadboard Eurorack Demo

Try not to let your heads explode when this sickness fondles your eardrums. Got my hands on an O.C. Electronics Spring Tank Reverb. On the breadboard I've built a driver circuit with voltage control of the wet/dry crossfader. Who does that???!!....

I do that. And today's demo shows you why. The Future Retro Transient+ is going through the spring tank. The mix is set mostly dry, but I'm using a short envelope to send a burst of reverb wet mix when the snare hits. Using the Beatstep Pro for that. That's what I'm talking about. That. Is what it's all about.

How did I do this? I've frankenstein'd a couple of circuits/ideas together to make this happen. At its core is a Tombolas DIY Spring Reverb Circuit w/ EQ and Drive Control to accommodate a wide variety of tanks. It worked very well, but I was not yet satisfied. For the Voltage Control, I've slapped away the final amp mix stage and replaced it w/ the VC Crossfader circuit by Thomas Henry. I dumped his VCA control, that's another project for another day, and to made some minor changes so it would play nice w/ the Tombolas circuit.

My DC571 Dual Compressor for Eurorack is Now Available

My DC571 Dual Compressor for Eurorack is now available in my Reverb Store. To operate the DC571:
1) plug in the audio input and output, making sure some sounds are present
2) set the switch up (compress) to activate the effect
3) turn the input knob until you hear clicks/pops (clipping) and then back it down a little
4) set the switch down (bypass) to compare the volume of the original signal
5) set the switch back up and turn the output make-up gain knob until the volume is the same as when you started. You may need to repeat steps 4 & 5, and it’s definitely ok to increase the output a little bit more if so desired! For even more compression, the channels can be cascaded in series. Do this by patching the output of channel 1 into the input of channel 2.

RM&S Ring Mod + Sub-Octave Generator now available

My Ring Modulation + Sub-Octave Generator module is now available at Reverb dot com!

RM&S is a 4HP Ring Modulator and Sub-Octave generator. The Ring Modulator is an active, CMOS-based circuit adapted from the ARP Odyssey. Ring Mod is usually generated from inserting square wave VCOs to Input 1 & 2. But that shouldn't stop you from sending sawtooth, wavetables and noise sources through this.

The Sub-Octave Generator circuit is derived from the Roland SH-101 and provides -1 and -2 octaves from a square wave plugged into Input 1. Many VCOs put out varying degrees of signal amplitude, a trim pot is provided to adjust input impedance of VCOs for the Sub-Octave Generator circuit.

Output jacks include: Ring Mod, summed Ring Mod + Sub-1, Sub-1, and Sub-2. The RM&S is hand-crafted in the USA.

Measured Current Draw: 2mA on -12V, 5mA on +12V, 5V not used

Three Machines = MS-20 + Juno-1 + Eurorack Synthesizers

Feelin' a good 100-bpm chill vibe today. Three Machines are: Korg MS-20, Roland Alpha Juno-1, and the Eurorack system. Future Retro Transient+ is swinging a nice CR-78 groove thanks to mapping some CVs from the Beatstep Pro, running through the Delta VCF to take the edge off the highs. The CEM3340 VCO doing the arpeggio thing using quantization from Ornament & Crime, running through the Tonus VCF. Euclidian triggers from Temps Utile. Bass from the Synthesizer Box. Playing a delightfully mindless riff on the MS-20. Some Timefactor Delay, some Big Sky Reverb. Recorded in one shot, some post-work done in Cubase.