E1DA Cosmos Scaler High Performance Low Noise and Distortion Audio Preamplifier with Variable Gain

E1DA Cosmos Scaler High Performance Low Noise and Distortion Audio Preamplifier with Variable Gain

Specification:
- Material and surface processing: aluminum + black oxide sandblasting + laser engraving
- Main components: OPA1612, OPA1656, for Viking resistor, for Murata/Samsung C0G capacitor
- Size: 104 x 61 x 39mm (PCBA: 90 x 50 x 29mm)
- Weight: 160g (PCBA: 40g)
- Power supply: USB-C, +5VDC, <500mA static current

Input:
- 2 channels balanced 200/100kohm bal/unbal.
- 3.5mm jack up to 20/10Vrms bal/unbal.
- If only the left input is inserted, the signal will pass through the right channel to achieve the MONO mode of Cosmos ADC.
- Cosmos APU's short cable is also suitable for Scaler.

Output:
- 2 channels balanced 20/10ohm bal/unbal.
- 3.5mm jack up to 20/10Vrms bal/unbal.
- Cosmos APU's short cable is also suitable for Scaler.

Variable Gain Table:
- 0, 7, 10.7, 13.38, 15.788, 17.38, 18.673, 19.844, 21.08, 21.98, 22.764, 23.513, 24.336, 24.965, 25.527, 26.078db.
- 16 positions are controlled by knobs.
- When the knob is in the "automatic" position, it is similar to a super fast automatic regulator (100mS), with a target voltage of 4.5Vrms for the left channel.
- The output voltage of the right channel can be ignored.
- The frequency range of the effective automatic rangefinder is 20Hz-20kHz.

Indicators (each channel on the front panel):
- 1.7Vrms < Blue LED < 4.5Vrms
- 4.5Vrms < Green LED < 10Vrms
- Red LED > 10Vrms

Frequency Response:
- 0.2Hz-570Hz at 26db gain +0.5/-3db; 0.2Hz-7~11MHz at 0db gain 10MHz region
- Depends on the cable capacitance (the output of the calibrator can remain stable within a microphone cable of up to 7 meters)

Residual Noise:
- 250nVrms (A) at 26dB gain (typical value)

Distortion:
- Due to the huge loop gain OPA1612 + OPA1656 (170dB at 1kHz / 130dB at 10kHz), the distortion compared to Cosmos ADC or H3 -175dB at 1kHz about 100 times lower (at 0dB gain)
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Crosstalk:
- L ->R: -133db at 1kHz
- R ->L: -158db at 1kHz
- Not using input short circuit at 0dB gain.

Package Included:
- 1 x Preamplifier