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Thanks! Might depend on how many good boards we have when we are done building them out. We will let you know...

We will contact everyone that is interested in beta testing (assuming we have enough prototypes) as soon as we finish testing and make some updates to the firmware and documentation.

A quick update... after moving all our shipping and development to a new location, we are finally getting the CT3660 prototype up and running on the bench.

The "does it sound like a BBD" question is really about what you are trying to achieve with a given design. It will have some sonic characteristics of BBDs like pitch shifting when the delay is modulated. It will not have others like the drop off in frequency response with longer delay times...

We looked into building silicon (instead of PCBs) for our CT3101 (MN3101 clone) and the barriers are just too high in many different domains (supply chain, capital investment/payback, technical design, production, quality control and characterization, and on and on). And the 3101 would have been...

I did a back-of-the-envelope feasibility check on using multiple MN300X chips to reproduce the multiple taps points of the MN3011. From what I could tell this is as close as you can get to the same tap points with current production BBDs: Number of Stages Comparison...

PM'ed you, thanks!

Beta test PCBs are in production! Due to parts shortages we can only get them partly assembled, we will need to finish soldering some of the components by hand. Currently the PCB design is about 2" x 1.7", I expect the final design to be smaller -- we did not spend a lot of time optimizing...

Too soon to hazard a guess. When the prototypes are built we will get a better idea (PCB design is in progress now).

Firmware Programs (PGM jumpers) Program Description 0 1 delay line, 4 taps, 660ms max delay 1 2 delay lines, 2 taps each, 330ms max delay each. VC_MSCALER defines full scale delay for all delay lines. Each tap in each line is independently controlled. 2 4 delay lines, 1 tap each...

Jumpers Name Function EN_3V3 When installed: Enables the onboard 3.3V regulator. External +5V supply must be applied to REF_5V pin and REF_3V3 pin is +3.3V reference output (200mA max). When removed: Disables the onboard 3.3V regulator. External +3.3V supply must be applied to REF_3V3...

Preliminary (Prototype) Pinout Conn Pin Name Function 1 1 GND Ground 1 2 VC_MSCALER VC master scaler: Sets full-scale delay for all delay outputs. 0V=0 delay, 3.3V=660ms delay. 1 3 VC_DELAY0 VC output 0 delay. 0V=0 delay, 3.3V = full scale delay as defined by VC_MSCALER. 1 4 VC_DELAY1...

Thanks for the update, sorry about the slow USPS delivery! No need for any voltage checks. -Mark

Making progress on prototype design and a question came up that we could use some input on... Is a 'bypass' feature really useful (e.g. an input pin 0=bypass, 1=normal delay)? A real BBD has a minimum delay based on max clock frequency, there is no zero-delay or bypass unless you build it...

The Eurorack power standard(s) are a bit of a mess, but generally specifies +/-12V with optional +5V. Some have the +5, some don't. The 10-pin connector configuration does not even have pins for +5V at all. So cannot assume 5V is available in Eurorack systems. Many modules that need +5 have an...

Yeah I was thinking along these lines (a buck converter for 5V, then a linear regulator for 5->3.3). I am hoping to remove the need for 5V so the module would require only 3.3V. That would simplify things and reduce overall system cost (although may raise the cost of the DBBD a bit). I get that...

Yes it depends a lot on what kind of system it is going into. A basic analog pedal is not likely to have 5 or 3.3 supplies whereas a synth system or hybrid analog/digital is quite likely to have at least one if not both. Eurorack modules have +-12V and 5V defined power rails, would still need to...

There are some audio effects imparted by the BBD. Some would call them defects, other call them "classic BBD sounds". Depends on what you are trying to achieve. Three significant effects are pitch shifting, inaccuracies caused by low frequency sampling, and noise. Pitch shifting happens when...

Other possible useful features? 1. Is there any need/usefulness to a bypass (0 delay no matter the CV inputs). Technically there is still some small delay from A/D and D/A conversion, about 0.02ms. 2. Is the chaining concept useful, e.g. is there a need for > 660ms of delay or more than 4 tap...

So one of our design ideas is to make the module configurable, probably with jumpers. The base components have these resources to work with 660ms of delay memory 4 analog in 4 analog out 6 CV in Here are some configuration ideas 1. One delay line, up to 660ms, with 4 independently...