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Thumbnail Filmstrip of DACT Phono Stage RIAA Preamp CT-100 Images
CT-100 Phono Amplifier
Description
The CT100 is a two-channel phono preamplifier module with a very accurate RIAA equalisation and many features. It is constructed with the best semiconductors available and non-inductive, low noise, SMD metal film resistors. The circuit is designed to accept both moving coil (MC) and moving magnet (MM) transducers / cartridges directly in order to eliminate the need for an external MC step-up transformer or amplifier. MC or MM input loading and input nominal level values are easy to select with high accuracy using DIP-switches.
The DACT CT100 is ideal for the most demanding applications requiring accurate RIAA equalisation, very low noise, extremely low distortion and superior sonic performance. The CT100 is a pre-assembled PCB ready for building into an enclosure or even better into your turntable (shorter signal cables). The high output voltage from the CT100 gives it an equivalent output to other signal sources like CD-players.
Features
- Compact design. Dual-mono. Very low noise.
- Balanced output option.
- Non-inductive low noise SMD metal film resistors.
- Input accepts moving coil or moving magnet (MC or MM) cartridges directly without step-up transformer.
- Input loading 10 Ohm to 47 kOhm for MC or MM selectable in 21 steps.
- Input nominal levels 0.1 mV to 10 mV selectable in 34 steps.
- High output drive. Balanced: 28V. Unbalanced: 14V.
- High accuracy RIAA equalisation with 0.05 dB tolerance.
- Additional time constants of 3.18 uS and / or 7950 uS are selectable.
- Total harmonic distortion 0.0003%.
- Low output impedance - drives long signal cables.
- High output current capability - drives even high impedance headphones.
- Two-stage dual-supply voltage regulator onboard for each channel. Separate DC supply input for each channel (dual mono).
- High-end matching power supply CT102 available.
Typical Applications
- High performance RIAA pre-amplifier for MC and MM cartridges.
- High performance RIAA headphone amplifier.
- Upgrading Hi-fi equipment.
- Reference RIAA pre-amplifier.
- Test equipment RIAA pre-amplifier.
Downloads
Download DACT CT100 Datasheet (290 KB)
Download DACT CT100 Instruction Manual (234 KB)
PDF files use Adobe Acrobat® Reader®, which is available here if required.
Block Diagram
Dimensions and Outline
DACT CT100 dimensions.
Specifications
Maximum Ratings
Note | Symbol; Parameter | (Conditions/Comments) | Value | Unit |
1 | VS, supply voltage |
| ±50 | V |
1 | VIN, input voltage | (AV = 40dB to 80dB) | ±1 | V |
1 | TS, storage temp. range |
| -40 to +85 | deg. C |
Operating Ratings
Note | Symbol; Parameter | (Conditions/Comments) | Value | Unit |
2 | VS, supply voltage range |
| ±9 to ±35 | V |
2 | TA, ambient temp. range |
| -25 to +70 | deg. C |
DC Electrical Characteristics
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified.
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified.
Note | Symbol; Parameter | (Conditions/Comments) | Value | Unit |
| RIN, input resistance | (DIP-switch selectable) | 10,15,18,20,25,30, 40,50,60,70,80,90, 100,150,180,200, 250,400,600,1k,47k | Ohm |
| CIN, input capacitance | (DIP-switch selectable) | Approx. 100,200,300,400 | pF |
3 | IB, input bias current | (Input bias current cancellation pre-adjusted) | Max. 0.5 | uA |
4 | PSRR, power supply rejection ratio | (AV = 40dB, 10Hz to 20kHz) | 120 | dB |
| RO, output resistance | (VO = 1V, DC to 100kHz) | 0.1 | Ohm |
| VO, output voltage swing | (Unbalanced operation) | Min. 14.2 | V |
| IO, output current | (RL = 100 Ohm) | 25 | mA |
| IS, supply current | (Each channel) | 22 | mA |
AC Electrical Characteristics
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified.)
(Typical values at TA = +25 deg.C and RL = 1k unless otherwise specified.)
Note | Symbol; Parameter | (Conditions/Comments) | Value | Unit |
| VIN, input nominal levels | (VO = 1V) | 0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.30, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.8, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 7.0, 8.0, 9.0, 10.0 | mV |
| VINO, input overload level | (f = 1kHz, AV = 40dB) | 100 | mV |
| AV, voltage gain | (DIP-switch selectable) | 40 to 80 | dB |
4,5 | dAV, RIAA equalisation deviation | (Ref.= 1kHz, 10Hz to 20kHz) | 0.05 | dB |
| BW, bandwidth | (-3dB, VO = 1V, AV = 40dB) | 2 | MHz |
4 | en, input noise voltage density | (f0 = 1kHz, AV = 80dB) | 0.5 | nV/Hz |
4,6 | S/N, signal to noise ratio | (AV = 40/60/80dB) | 98/90/71 | dB |
4 | CS, channel separation | (AV = 40dB, 10Hz to 20kHz) | 120 | dB |
4 | THD, total harmonic distortion | (AV = 40dB, f0 = 1kHz) | 0.0003 | % |
Notes
- Exposure to maximum rating conditions for extended periods of time may affect device reliability.
- Operating ratings indicate conditions for which other device parameters may not apply.
- At power up and power down the value may be maximum 5 uA for less than one second.
- Measured with Panasonic Audio Analyser VP-7722P.
- RIAA time constants are 75 uS, 318 uS and 3180 uS Additional time constants of 3.18 uS and 7950 uS are DIP-switch selectable.
- Input short-circuited. Reference: 1V. Response: RMS. Weighting: IHF-A.
PCB
DACT CT100 PCB solder-side.
Review
Click here for a review by The Audiophile Club of Greece. (221KB) Note: Outside link.
PDF files use Adobe Acrobat® Reader®, which is available here if required.
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