The A-178 is a Theremin module for generating a variable control voltage by approaching/removing hand to/from an antenna. Additionally the module is equipped with a gate output with adjustable threshold level.
Controls are provided for Offset (zero adjust) and threshold. Connections are for the antenna input, CV out x2 and 2x LED to help set CV control positive/negative and zero offset adjust.
To simulate the original Theremin, two A-178 modules are required, one for the VCO (e.g. A-110 or A-111) and one for the VCA (e.g A-131). Of course the A-178 can be used to control other functions in the A-100 such as filter cut-off, modulation depth and/or speed/tempo and attack/decay time and so on.
Since 2012 the A-174 now uses a locking BNC connector on the antenna.
