MM2315 panel

All about it

A Meccano set for frequency shifting!

The 2315 "Corlette" Dual Balanced Modulator/Dual Phase Splitter accepts the challenge posed by Serge Tcherepnin in his Waveshaper Media interview, when he stated that Don hid a lot of the functions of his models behind the panel. While there is a grain of truth to this for the 200 series, in the 100 series Don did provide granular functions that could be assembled to make more complex things, at the cost of panel space. 

It's also true that frequency shifting in modular synthesis is seen as some sort of mystical art where "big knobs" on front panels somehow magically justify the cost of the module, in other words a pretension waiting to be pricked. Hmmmm......

What we have done is take the minimalist 100-series interface style and combine five of the six building blocks you need to assemble a frequency shifter into one panel, so that four of them can be used totally flexibly for other uses.

The parts are: Two phase splitters to generate quadrature signals from audio and sub-audio signals, and two precision balanced modulators based on the proven circuit in our MM315 module, as well as sum and difference circuits hard-wired to the outputs of the balanced modulators.

All that is needed to make a working frequency shifter is four short audio leads to patch the outputs of the phase splitters into the ring modulators, and a good quality sinewave oscillator.

Tech Notes

The balanced modulators are a design we have used for over 5 years-originally a Motorola reference design used in the Aries system-and have excellent audio quality and musicality. For the phase splitters we are working on adapting a vintage 1950 design that has excellent performance.

Tech Specs

Power requirements

+15V: TBC

-15V: TBC

+5V: not required

+12V: not required

+24V: not required.


Buchla-compatible  (4U, quarter-panel) single unit

38mm depth below mounting rails with connected power cable 


User manual on its way!



In development, anticipated available northern autumn 2019.


Watch this space