A-149-4 Quad Random Voltage Source

The A-149-4 module is now the third member of the “A-149 family”. All three modules are about generating random voltages or trigger signals that go well beyond the possibilities of the random/noise modules A-118-1, A-118-2 or A-117. The A-149-1, which is based on the Buchla module 266, already has quantized voltages available that can be … Read more

A-143-1 Complex Envelope Generator / LFO

The Complex Envelope Generator is a very versatile modulation source. It consists of four AD envelopes (i.e. there are only attack and decay phases), which can be cascaded in any combination, trigger each other or be operated in an “LFO” mode. Due to the complexity of the circuit and setting options, the A-143-1 requires a … Read more

A-143-4 Quad VCLFO/VCO

The Quad VCLFO is actually almost a “real” VCO: It even has temperature compensation, which allows it to remain in tune even with external temperature fluctuations. Doepfer points out that the A-143-4 is not quite as accurate as the VCOs of the A-110 or A-111 series, but from my point of view it can be … Read more