Modular Benjolin

Thank you for sharing these schematics; the various circuits appear to be beneficial for numerous projects. The control voltage (CV) section, in particular, is highly versatile. Currently, initial stages are underway for creating a Benjolin PCB in collaboration with Rob. There is hope for timely completion. On an electronic music forum, there is a question regarding a specific part of the schematic: what is J2/HDR16? It features multiple 100k resistors, and the wiring to other components is unclear. J2/HDR16 is crucial as it represents the outputs of the discrete waveforms that comprise the Benjolin. These outputs can be utilized to interface with other equipment as control or audio signals, or they can be connected to the voltage-controlled oscillator (VCO) and voltage-controlled filter (VCF) control voltage inputs. This connectivity is essential for maximizing the functionality of the device. A new upgraded Benjolin PCB and kit is in development, which will incorporate an echo feature, with hopes of availability by summer. There is enthusiasm for the project, including the possibility of inviting Rob to France for a workshop. It is noted that the outputs are solely from HDR16, while inputs exist elsewhere on the board, specifically for the VCOs and VCF. The outputs from HDR16 can be employed to control these components or can be used in conjunction with another Benjolin, creating an excellent synergy between two units. Apologies were made for not reading previous comments thoroughly. The Benjolin is considered to stand out among synthesizers, and the news of this project is appreciated, especially for those unable to attend workshops. There is a desire to wait for this project rather than pursuing independent etching of Benjolin boards.

The Benjolin synthesizer is a unique and versatile instrument that combines various synthesis techniques to create complex sounds. The schematic includes a section labeled J2/HDR16, which serves as a critical interface for the discrete waveform outputs. This section is populated with multiple 100k resistors, which are used to manage signal levels and ensure proper interfacing with other modules or equipment. The outputs from J2/HDR16 are intended to be used as control signals or audio signals, allowing for extensive routing options in a modular synthesizer setup.

The VCO and VCF sections of the Benjolin are designed to accept control voltages from external sources, including the outputs of J2/HDR16. This design facilitates dynamic interaction between the various components of the synthesizer, enabling users to create evolving soundscapes and complex modulation effects. The ability to patch outputs into the VCO and VCF control voltage inputs is essential for achieving the desired sonic results, as it allows for real-time manipulation of pitch and filter characteristics.

The upcoming upgraded Benjolin PCB aims to enhance the original design by incorporating additional features, such as an echo effect, which will expand the sonic capabilities of the instrument. This development reflects a commitment to innovation and improvement in synthesizer design, catering to the needs of both novice and experienced users.

Overall, the Benjolin synthesizer's design emphasizes flexibility and creativity, making it a valuable addition to any electronic music setup. The collaboration with Rob and the community engagement surrounding the project highlight the importance of shared knowledge and support in the development of new musical instruments.Thanks for putting these schematics up, the different circuits look like they`ll be useful for many projects. The CV section alone, is vastly usable. Brilliant! I am in the very beginning stages of making a mighty benjolin PCB with Rob himself. I`m crossing my fingers that it will all come together in a timely fashion. As on electro music forum, i don`t understand one part of the schematic : what is J2 / HDR16 Lots of 100k resistances there. but i don t understand how to wire it to the other parts Ahh. J2/HDR16. Thats where all the magic is! Those are all of the outputs of the discrete wave forms that make up the benjolin. You can use these to patch into other gear as control signals or audio signals or patch them into the VCO&VCF CV inputs. This is the key to unleashing the monster. (I`m finally working with rob on a new upgraded bejolin PCB and kit. This one includes an echo! I`m hoping to have it done and in my store by this summer. Wish me luck!) Hope you`ll make it real I`ve personnaly found some ics, so i think i`ll breadboard mine soon.

But i`ll be happy to get you kit, and why not invite you & Rob in france for a workshop They are only outputs. There are inputs elsewhere on the board. The VCOs and the VCF all have voltage inputs. You can use the outputs from HDR16 to control them or you can use another benjolin. Two benjolins together is a great combination! Apologies, i should have read the above comments more thoroughly. The benjolin really stands out from the other synths IMHO and for those of us who cant get to a workshop this is brilliant news.

I wish you all the best with it. This looks really awesome. I`d been toying with the idea of finding someone to etch a couple benjolin boards for me, but I think I`ll just wait for this one. I like it! (fingers crossed it`s still going to happen) 🔗 External reference