Keyboard Contacts Access

5.1 Types of Voltage Controlled Filter Modules 4012,4072 The later model 2601's use a 4072 filter module. This module is physically larger than the 4012 and is not encapsulated. In order to use the newer style filter in an older unit, modifications are required to the control input as shown on the circuit below. The newer 4072 module is identical in operation to the 4012.

251 Voltage Controlled Amplifier

The VCA controls the amplitude of a signal passing through it. When the initial gain slider on the front panel is at maximum, the signal will pass through the VCA with no change in amplitude (unity gain). If the gain slider is at a minimum, no signal will pass through the VCA unless a positive control voltage is applied to either of the two control inputs. The sensitivity of the left control input is linear but the response of the right control input is exponential. The left control input is...

322 Tracking Definition

Oscillators which are tracking together will maintain The 4027-1 replaces all other oscillator modules. If only one module is to be replaced in a unit containing the 4017 or 4027 modules, follow the 4027-1 2.6 Noise Generator, Voltage Processor, Sample & Hold, Internal Clock, Amplifier 2.6.1 NOISE GENERATOR (Module 4022) The Noise Generator provides a +20 volt peak to peak noise signal of about 10 octaves bandwidth. The right Noise Generator slider controls the amplitude of the noise and the...

Model 2600 Block Diagram

Arp 2600 Diagram

Raise VCO 1 slider into the filter and close VCF initial and fine tune sliders. 2. Raise the ADSR control slider. 3. Select ADSR settings so that a sharp envelope occurs when a key is depressed. 4. Listen to the output of the filter through the Monitor speakers while depressing each key sequentially from left to right. 5. Each key should produce a well-defined sharp pulse of sound. If not, then either the sequence of contact closures is incorrect or the contacts and or bus bar are dirty. 6....