Buchla Model 285t Frequency Shifter (Pre-Order)

Buchla Model 285t Frequency Shifter The Frequency Shifter receives and 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 1kc. The resulting shifts are present at the “difference” and “sums” outputs. There are two identical outputs for each of these. 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 “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 knob manually sweeps from zero (the pure incoming “signal”) through amplitude modulation ending in pure ring modulation. When this knob is set fully CW to “ring” it is the same signal as the “ring” outputs. The