ARIES AR-331 PRE-AMP / ENVELOPE FOLLOWER MODULE

The Aries AR-331 is a 4-function module which includes a pre-amplifier, an envelope generator, a threshold detector and an inverter. The pre-amp is a 40 dB gain amplifier necessary for interfacing most external signals to the synthesizer. For convenience, the pre-amp inputs include a mini jack, an RCA (phono) jack and a 1/4-inch (phone) jack. The pre-amp gain is manually controlled from the front panel.
The envelope follower produces a DC voltage proportional to the average amplitude of an audio input signal. In other words, this function can derive an envelope from an external signal.
The threshold detector is a comparator circuit with a manually-controlled threshold. When the amplitude of an input exceeds the threshold, a +10 volt gate is produced at the output. When the signal's amplitude falls below the threshold, the gate falls to 0 volts. A trigger output is also provided from the circuit and the trigger coincides with the rising edge of the threshold detector's gate output.
The inverter is identical to other Aries Music inverters and is included in this module as a convenience.

SPECIFICATIONS:
• Pre-Amp Gain - 0 dB to +40 dB
• Envelope Follower Output - 0 to +10 volts
• Inverter Gain - 0 to Unity
• Threshold Detector Input - 0 to +10 volts (positive comparison only)
• Threshold Detector Output Gate - +10 volts
• Power Consumption -
• 12mA at +15V
• 12mA at -15V