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Curtis Cem 3372
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cem 3372

 

CEM 3372

The CEM 3372 is a generalpurpose signal processisng device for audio tone sources.Included on-chip are a two channel voltage controlled input mixer, a dedicated 4-pole low pass voltage controlled filter with voltage controllable resonance,and a quality final voltagecontrolled amplifier. With theexception of the filter cut-off frequency, all control inputs are very low bias current, high impedance inputs which range from 0 to +5 volts. This feature allows the common DAC output voltage in a microprocessor system to be multiplexed to these inputs with only a CMOS analog multiplexer and hold capacitors, thus eliminating the usual Sample & Hold buffers. The two input VCAs of the mixer feature audio taper control scales and high attenuation at zero control voltage. The signal inputs are low level (80mV.P.P. for 5% THO), allowing multipletone sources to be conveniently mixed into each channel. A unique feature of the 24dB/octave filter is that, unlike others of this type, the passband gain remains constant as the amount of resonance is varied, thus eliminating the annoying drop in volume at higher resonance settings. Otherfeatures include wide frequency control range, temperature compensated transconductors,low noise, low control feedthrough, and a smooth behaviour when swept.The final output VCA is a current in, current out type, allowing multiple inputs to be easily mixed into its input, and easy interface of its output to the rest of the system. The control scale is very linear, and the point at which the VCA shuts off is very well defined (+100mV ± 50mV). OWing to its exceptionally low
noise and exceptionally low control feedthrough witbout trimming, this VCA is well suited to being controlled by fasttransient waveforms.e

 

Machines using 3372:

 

Akai Ax80

Fender Chroma Polaris

Oberheim Xpander

Sci Prophet 600

Sci Prophet T8

Sci Six-track

Sci Prophet Vs

Simmons Sds8

 

NOTES: depending on release boards, the chips may change

synth based

 

diagram board

diagram board

 

 

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Trade board ONLY for cem 3372

 

 

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