Bastl Instruments — ABC Mixer
Download the Bastl Instruments ABC Mixer Manual (PDF)
Bastl Instruments ABC Mixer Cheat Sheet
Overview
- ABC is a compact 6-channel mixer for eurorack, primarily designed for audio mixing, but modifiable for mixing CV.
- It can function as two independent 3-channel mixers or as a single 6-channel mixer, depending on jack usage.
Inputs & Outputs Reference
| Label |
Type |
Function |
Voltage Range |
| A–F |
Input |
Six AC-coupled audio inputs (can be modded for DC, see below) |
Audio: ±5V typical |
| A+B+C |
Output |
Mix of inputs A, B, C (if used, output is isolated from D+E+F) |
Audio out |
| D+E+F |
Output |
Mix of inputs D, E, F, PLUS A+B+C if the A+B+C out is unused |
Audio out |
Front Panel Controls
| Control |
Type |
Function |
Range |
| 6x Gain Knobs |
Knob |
Individual input level A–F |
0–1 |
No buttons, sliders, or toggles on front panel.
Key Usage Tips
- Dual Mixer Mode: Use both A+B+C and D+E+F outputs for two separate 3-channel audio mixes.
- Single Mixer Mode: Leave A+B+C output unplugged; all six inputs mix at D+E+F output.
- Maximum Gain: Each channel's gain knob goes from 0 (off) to 1 (unity gain).
- Stereo Use: Use normalization jumpers on rear for quick stereo sets—A to D, B to E, C to F.
Customization (Back Panel)
- Solder Jumpers (6 jumpers): Configure to bypass input capacitors, changing from AC to DC coupling. This enables CV mixing (mixes DC voltages).
- Normalization Jumpers (3 jumpers): A→D, B→E, C→F for stereo/linked setups.
Technical Specs
- Width: 5 HP
- Depth: 35 mm (skiff friendly)
- Power: +12V (<10mA), -12V (~10mA)
- Protection: PTC fuse and diode
- Coupling: AC (unless modified for DC/CV)
Installation Notes
- Double check ribbon cable polarity!
- Red stripe = -12V rail
- Only connect/disconnect power with your case powered off.
Links
Download the Bastl Instruments ABC Mixer Manual (PDF)
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