TipTop Audio Buchla Model 285t Frequency Shifter Eurorack Module (18 HP)

Frequency Shifter Overivew

• The Frequency Shifter receives external audio at its signal input then shifts it with either its internal oscillator INT or with an external oscillator at the ref. input. There is a switch to choose either INT or ref. The INT oscillator frequency goes from 0 to 1 kHz.
• The CV input is sent to the INT oscillator and can be varied with its attenuverter.
• FM receives an audio input and can be applied to INT. The amount of modulation is determined by the attenuator knob.

Balanced Modulator Overview

• The Balanced Modulator receives an audio signal at the signal input. This can be thought of as the carrier while the ref. input receives a different audio signal (the modulator).
• The CV input and its attenuverter modulates the sweep from zero amplitude to full ring modulation.
• The ring double output is a pure ring modulation determined by the incoming signal and ref.
• The bottom Modulation section applies to the variable double output.
• The Amplitude knob manually sweeps from zero (the pure incoming signal) through amplitude modulation ending in pure ring modulation. When this knob is set fully clockwise to ring, it is the same signal as the ring outputs.

Model 285t

The 285t Frequency Shifter is an interesting module for processing audio samples or live voice input via a microphone through the separately available 207t Mixer/Preamplifier module. The sum and difference outputs from the 285t can then be routed to the separately available 292t Quad Lopass Gate, creating dynamic tone shaping. By further splitting the processed signals into the left and right channels, this setup allows for a rich stereophonic effect.

TipTop Audio 285T Specs

Power	+12 V 50mA / -12 V 44mA
Size	18 HP Depth: 1.8" / 45.0 mm
Weight	Not Specified by Manufacturer

Package Weight	0.725 lb
Box Dimensions (LxWxH)	6.1 x 4.8 x 3"