Motivation
This module provides high precision CV outputs in 1V (octaves) and 83,3mV (halves) steps. The 1V output goes from 0 to 8V. The 83,3mV steps goes from -5 to plus 5 steps (halves). This module is thought for all who are missing octave switches in some modules. Especially in VCO. With this module you can switch octaves and halves as well.
Specs and features
- High precision output 0-8V in 1V steps (octaves)
- High precision output in 83,3mV steps, +/- 5 steps (Halves)
- Runs on +/-15V and +/-12V
- Schematic ADSR
- Pictures
- Download docs
Implementation
Schematic
Scaled Voltage Reference schematic
Description:
The precision voltage is derived from the REF102. The negative voltage is provided with the INA105. It is crucial to match the resistors in the voltage dividers as good as you can. The outputs of the voltage dividers are buffered to avoid loading of the dividers. The resistors around the OpAmps must be matched as well. The one volt and the 83,3mV steps are added together with IC4A. The three outputs are individual buffered.
Special parts
- None. Match all resistors as good as you can.
