Firmtronics DigiMix-II Manual

DigiMix-II
Programmable Elevon and V-Tail Servo Mixer

Introduction

Thank you for your purchase. DigiMix-II is an advanced electronic servo mixer for radio controlled
'flying wings' and V-Tail aircraft. It has a number of features which are normally only found on
computerised radio systems, allowing customised set-up of the control surface movement. The
amount of servo movement for elevator and aileron / rudder ('flying wing' / V-Tail aircraft,
respectively) may be individually programmed from 1% to 120% of standard movement, giving the
ability to increase or decrease the sensitivity of each, depending on pilot experience. This feature
makes DigiMix-II ideal for beginner and intermediate pilots, where sensitivity of elevator and/or
aileron/rudder may be increased as pilot ability improves. Experienced pilots may increase
sensitivity beyond the normal range offered by standard radio equipment, by programming full
(120%) movement for extreme and fast manoeuvres. DigiMix-II uses a powerful RISC processor
and well designed software for reliable, trouble-free operation.

Features

• Independently programmable elevator & aileron/rudder servo travel for customised sensitivity.
• Calibration feature detects centre servo position for better output symmetry.
• Configurable servo reverse.
• Programming interface uses transmitter control sticks (no switches on the device).
• Setting retained during power-off.
• RISC processor driven.
• Smooth servo travel.
• Low power consumption.
• Extremely compact and light weight.

Technical Information

Input Timing Resolution
Output Signal
Operating Voltage
Operating Temperature
Current Consumption
Weight
Board Size
Mixing
NOTE: Supplying more than 6 volts to the mixer could cause permanent damage. Please only use 4 cell
battery packs.

Connections

Figure 1 on the right illustrates the JR (& Futaba) compatible output
connectors as viewed by looking directly at the connector pins with
the circuit board on the underside. The input leads are connected
to the receiver (not shown) and are marked as "Input".
0.625µs
1.5ms ± 0.05ms to 0.6ms (programmable in 0.05ms increments)
2.7 V to 6.0 V
-20°C to 80°C
4.0 mA
3.0 g
16 x 10 x 8 mm
50%
Figure 1. Output connector.