Boxing

A multifunctional module based on channel selection

The Boxing module is a multifunctional module based on channel selection. It can implement channel selection, four-step or two-step sequencers, differential signals, square waves, logic functions, and more.

The two jacks and two switches at the top constitute the control part of the Boxing module, which is a binary four-bit input. For ease of understanding, let's consider jack 1 and switch 2 as contestant A, and switch 3 and jack 4 as contestant B. For contestant A, when switch 2 is in the lower position, the A input is at a low level, denoted as L. When switched to the upper position, the A input is at a high level, denoted as H. If a signal cable is inserted into jack 1, switch 2 will be bypassed, providing a square wave signal to jack 1, with the troughs representing a low level L and the peaks representing a high level H. The situation for contestant B is the same as for A. Now, by combining A and B, we get four scenarios: LL, LH, HL, HH. These four scenarios determine which of the four input jacks 7, 8, 9, 10 will be connected to the output jack 14. The small star patterns next to jacks 7, 8, 9, 10 indicate under which scenario they will connect to output 14.

In short, we can use two square wave signals to select which of the four signal paths from input jacks 7, 8, 9, 10 can be output through jack 14.

When one or more of jacks 7, 8, 9, 10 do not have a signal cable inserted, the corresponding knobs 5, 6, 11, 12 will add an adjustable voltage to jacks 7, 8, 9, 10. With the control signals from the top, we can output this voltage through jack 14. By adjusting knobs 5, 6, 11, 12 to different voltage values, we can obtain a four-step sequencer output (with two sets of square waves input to jacks 1 and 4) or a two-step sequencer output (with only one square wave signal given to jack 1 or 4). In the same way, we can implement AND, OR, NOT, NAND, NOR logic outputs with jacks 1, 4, which will not be elaborated here.

Output jack 13 is the differential output of output jack 14, meaning the output voltage of jack 13 is 9v minus the voltage of jack 14 (with some error), i.e., if jack 14 outputs a high voltage, jack 13 outputs a low voltage.

Jack 15 is a controllable square wave output, its frequency is affected by the voltage of jack 14.

The Boxing module is like a boxing ring, where the different moves of contestants A and B collide, resulting in three final match outcomes.

***Note: A special usage is that jack 14 can act as an input port for reverse input, in which case jacks 7, 8, 9, 10 can output the voltage of jack 14. To preserve this special usage, some voltage attenuation is inevitable, whether used in forward or reverse. Therefore, avoid using Boxing to conduct v/oct control voltage.

https://earmodular-website.pages.dev/boxing