A-185-2 Precision Adder

Doepfer's precision control voltage adder: four inputs summed to 0.1 % for the pitch of VCOs, each one added, subtracted or off by its switch, and normalled to +1 V so the switches work as octave switches.

Key features

• Input 1 with the Lev.1 attenuator (logarithmic): a modulation depth, or a fine tune when unplugged
• Inputs 2 to 4 at exactly unity gain, for keyboards, sequencers and MIDI-to-CV
• A three-way switch per input: add, off, subtract; unplugged, each adds or subtracts 1 V
• Three outputs and an inverted one; a jumper can send the sum to the A-100 bus CV line