Cloud CX335 Specifications download pdf (Page 17)

Page 16 CX335 Technical Manual

The term 'programme dependant' means that when a large, fast transient occurs the

circuits charge and discharge more rapidly.

The two LPF and HPF control voltages are Or'd with the output from the limiter and the

output from the remote control sensor circuit to produce a common control line IC14a. For

troublesome faults, each control voltage can be isolated at the input of IC14a by

progressively isolating the following diodes: Limiter via D9, HPF control via D8, LPF

control via D11 and any remote control via D12. The output of IC14a has a preset to

compensate for component tolerances and is summed with a DC voltage derived from the

Gain control VR4. This Gain control supplies 0 Volts for 0dB gain, a preset for each

channel adjusts this voltage exactly to match the detent in the rotary gain control and

compensate for any component mis-match in the audio path.

7.03 The Displays

The three display meters are very similar in design. All LED meters are driven from a

constant current source restricted to 8mA. For the two VU displays, the outputs from the

bypass switches are rectified using IC28 (IC23). This rectified voltage is then

progressively compared to a resistor ladder calculated to give an accurate VU display.

The gain reduction display voltage is derived from the output of IC14a post preset PR5.

Note that the tally LEDs are driven in series with the right channel VU and gain reduction

meter displays, should any one LED be open circuit then neither meter bargraph will

function.

7.04 The Power Supply

The CX335 has a standard bi-polar 15-0-15 Volt power supply derived from two

adjustable regulators. This enables a smooth power-on as the reference pins of the

regulators are slowly established by capacitors C58 and C55.

7.05 Remote Control

It is possible to control the CX335 compressor side chain with an external remote voltage.

The VCA control pins can be driven remotely by a DC voltage. A factory built unit will

normally be configured so that +15V input will result in 56dB of gain reduction, but this

can easily be reconfigured by changing the gain around IC17b. The 9pin 'D' socket also

has voltage points to be able to fit a potentiometer or another circuit, depending on

installation requirements. Note that provision in the PCB is made for additional noise

immunisation using an inductor, removing R73 and fitting RCMAN (100k Ω). This control

is a specialised operation and is intended for future expansion of CLOUD products and

interfaces.

Access for Service

The CX335 compressor limiter be accessed for servicing by the following method:

1: Disconnect the unit from the mains.

2: Using a number 2 size pozidrive screwdriver, remove the six self-tapping screws

retaining the top panel of the unit.

3: Using a number 1 size pozidrive screwdriver, remove 4 M3 machine screws that retain

the main PCB to the bottom panel. These can be located:

3.1: Just behind the Threshold control

3.2: Directly behind the Gain Reduction display meter.

3.3: In front and to the rear of the grey encapsulated transformer block.

4: From the underside of the unit, remove the six self-tapping screws retaining the bottom

panel of the unit, using the number 2 pozidrive.

5: Extreme caution should now be taken before any power is re-applied to the CX335 as

many live and high voltage points can easily be touched.

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Cloud CX335 Specifications Page 17

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