aion Minima Manual - Página 5

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BUILD NOTES

R4 resistor

A 47R resistor has been added to this circuit so that the output impedance of Q1 does not have an

adverse affect on the filter peak. It limits the high frequency bandwidth when the effect is in "Hi" mode.

This resistor mod was suggested by

we didn't do any extensive testing. We recommend keeping it in place by default but you can jumper it if

you want.

Frequency switch

The frequency switch on the original Micro V is a 2-position switch with "Lo" and "Hi" modes. The

Minima adds a 3rd mode in between the other two with the use of a DPDT on-off-on switch. "Lo" is

the bottom position, "Hi" is in the middle, and "Mid" is the top position. (Note that the original Micro

V factory schematic reverses the "hi" and "lo" labels; the circuit is in "hi" mode when the resistor and

capacitor are disconnected, not when they are engaged.)

To tweak the frequency of the "Mid" mode, you can try reducing the value of C6, e.g. 22n or 15n.

Attack and Decay knobs

The original Micro V circuit only had a Range knob and a Frequency switch, in keeping with its low-cost

philosophy. However, it's pretty straightforward to add both Attack and Decay knobs, so we've included

these by default. Here are the specifics on the changes:

• R12 is a 680R resistor in the original unit. This has been replaced by a 220R resistor to set the

minimum, and a 2kB potentiometer for an Attack control. The original attack value is found

between 9:00 and 10:00 on the rotation.

• R13 is a 47k resistor in the original unit. This has been replaced by a 10k resistor to set the

minimum, and a 100kB potentiometer for a Decay control. The original decay value is found

between 11:00 and 12:00 on the rotation.

MINIMA RESONANT FILTER

Rob Strand on

DIYSB. Note that it's a mostly theoretical addition—