Control Voltage Inverter Model 157 + Bandpass Filter Model 194

The Model 157 is a four channel unit complements control voltages to accomplish a variety of inverted functions.

And the Model 194 is a fixed-frequency bandpass filters with four output ranges. Divides an input signal into four fixed frequency bands. Cross-over frequencies are 200 cps, 900 cps, and 4 kc. Slopes have sharp knees and are 12 dB/octave.