Great module! Not only can it do awesome Tangerine Dream Ratcheting, but it can also act as a frequency multiplier...! input a Square Wave from a VCO and let it generate higher frequencies!

• Power Ribbon and Screws included.
• Slight rack rash.

Product Blurb
Module A-132-4 contains four identical voltage controlled amplifiers (VCA) with exponential control scales. Each VCA has two control voltage inputs (C1, C2), a signal input (In) and a signal output (Out). The control voltage inputs C1 and the signal inputs can be normalled by means of internal jumpers, i.e. the corresponding input signals of unit #1 can be connected to the switching contacts of unit #2. Those of unit #2 can be normalled to unit #3 and those of unit #3 to unit #4. If the normalling is not desired the jumpers have to be removed. In addition the sum of all four outputs is available (bottom left socket with the sum sign). Therefore unit #4 has only one control voltage input (only C1, no C2). If desired this socket can be jumpered as control voltage input 2. But then the sum signal is no longer available as a socket (only as an internal pin). For each VCA output a jumper is available that determines if the output signal of the corresponding VCA is added to the sum signal. From the factory all four jumpers are set (i.e. all four VCA output signals are added). By removing of one or more of the jumpers one can choose which VCA output is added to the sum. The jumpers can be replaced by switches too.

Technical note:
Due to the nature of clock multiplying it takes a few input clock pulses until the clock output is stable when the frequency of the Clock In changes. One has to average a few input clock pulses to generate the multiplied clock output signal. Even when the input clock frequency changes it will take a few cycles until the output clock signal is correct as the module cannot for see the future of the clock input signal. The generated clock output signal is derived from the last few cycles of the clock input signal. Consequently the module should be driven only by a clock signal with constant or slowly changing frequency.

FYI:
JP2 on the top of the Doepfer A‑160‑5 is not a user‑accessible feature — it’s an internal jumper header used by Doepfer for factory testing and calibration. IT IS NOT POWER!

• Width: 4 TE / 4 HP / 20.0 mm
• Depth: 35mm (measured from the rear side of the front panel)
• Current:+50mA (+12V) / -0mA (-12V)