Doepfer A-171-4 Quad Voltage Controlled Slew Limiter Eurorack Module

Module A-171-4 is a fourfold voltage controlled slew limiter. It’s intended purpose is polyphonic portamento but can be used also for other applications where several slew limiters are required.
The common slew time can be adjusted manually and in addition controlled by an external control voltage.

The module uses light-sensitive resistors (LDR). Therefore the slew times are not exactly the same for all units due to the tolerances of the LDRs and the LEDs, which are used to illuminate the LDRs. Inputs and outputs of the slew limiters are buffered to avoid voltage drops. This is especially important for polyphonic portamento applications.

Each output can drive several VCOs without the need of external buffers. In addition the slew limiter inputs and outputs are available at internal pin headers for internal pre-wiring of polyphonic patches. As the switching contacts of the sockets are used for the internal pre-patching the internal patch can be overridden by using the sockets at the front panel.

The module has these controls and in/outputs available:

• Control Man. : manual control of the slew limiter value (base value)
• Control CV: attenuator for the signal applied to the CV socket
• Socket CV: control voltage input
• Sockets In 1…4: slew limiter inputs
• Sockets Out 1…4: slew limiter outputs
• LED: visual control of the slew limiter value (dark = long time, bright = short time)

Manufacturer Product Page HERE