CP554 Diode bridge compressor for 500 series - DIY Analog Pro Audio
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  • CP554 Diode bridge compressor for 500 series - DIY Analog Pro Audio
  • CP554 Diode bridge compressor for 500 series - DIY Analog Pro Audio

CP554 Diode bridge compressor (mono) for 500 series

$553.60
$553.81 VAT incl.
$553.81 VAT excl.

The CP554 is a transformer coupled diode bridge compressor based on the design of legendary British consoles, adapted to the 500 series format.

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CP554

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The CP554 is a transformer coupled diode bridge compressor based on the design of legendary British consoles, adapted to the 500 series format.

It is the ticket to immediate access to the classic, harmonics-rich sound of the seventies.

The CP554 adds some features to the original such as a variable attack time, one additional 12:1 ratio or a high-pass filter in the side chain with three frequencies.


Highlights

    • Three Carnhill transformers in the audio path,
    • Same output stage as in the MP573 preamp,
    • Variable attack time,
    • Additional ratio of 12:1 makes a limiter,
    • Side chain EQ with 3 high-pass frequencies,
    • External side chain input,
    • All stepped controls,
    • Analog gain reduction meter,
    • High grade electronic components throughout,
    • High grade four layers PCB,
    • Available assembled or as a full kit (everything included).

Controls

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1: STEREO Connects two compressors in stereo. Whichever unit receives the loudest signal at any moment, controls the sidechain

2: Meter displays the gain reduction in DB.

3: THRESHOLD Rotary switch that sets the input level at which compression begins, from -21 to +12 dBu.

4: RATIO Rotary switch that sets the compression ratio from 1.5 to 12.

5: ATTACK Rotary switch that sets the attack time from 0.5 to 16 milliseconds.

6: 50-100-200 Hz Inserts a 50, 100 or 200 Hz high-pass filter in the side-chain. Produces a Fat sound and eliminates bass driven pumping.

7: BYPASS Hardware bypass by relay (when button is released).

8: MAKEUP Rotary switch that restores the signal level after being compressed.

9: RECOVERY Rotary switch that sets the release time from 100ms to 1.5 second. The A1 and A2 positions set 2 automatic release times which are program dependent (fast on isolated peaks but slower for the average level).

10: SIDE CHAIN Controls the source for the side chain. It can be INT: internal, OFF: No compression, EXT: the side chain comes from the second input (the module is 2 units wide)


What's in the kit?

Absolutely everything!

  • 3 Transformers,
  • Passive components (resistors, capacitors),
  • Active components (diodes, transistors, IC's),
  • Front panel elements (switches, potentiometers, analog meter, knobs),
  • Connectors, relays,
  • PCB's,
  • Front panel and side panels,
  • All hardware.

You bring the solder (use good quality solder, 1mm diameter max) and the Lunchbox.



Difficulty level

The CP554 kit is a medium difficulty kit. Nothing difficult but a large number of components.

The setup is simple but requires using a good quality digital multimeter.

PK019

Specific References


Technical specifications

Measure Conditions Value
Noise Gain 0dB
Gain 0dB, A weighted
< -78 dBu
< -82 dBu
Maximum output level before clip f=1kHz +26.5 dBu
Frequency response Deviation +/-1 dB 10Hz - 28kHz
Idle supply current No input signal V+ : +105 mA
V- : -97 mA
Input impedance f=1kHz 10 kΩ
Output impedance < 80Ω
THD + Noise f=1kHz without gain reduction < 0.02%

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CP554 Diode bridge compressor (mono) for 500 series

The CP554 is a transformer coupled diode bridge compressor based on the design of legendary British consoles, adapted to the 500 series format.

Write your review