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DACT
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Phono preamplifier module with
very accurate RIAA equalization (0.05dB).
Adapts to practically all MC and
MM cartridges on the market through a wide range of gain,
input resistance and input capacitance
settings.
No step-up transformer required
for MC cartridges.
Dual-mono design with option for
using two separate power supplies.
Balanced output option built
in. | |
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DESCRIPTION
The CT100 is a two-channel phono
preamplifier module with very accurate RIAA equalization and
many features. It is realized 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/MM input loading and input
nominal level values are easy to select with high resolution
by DIP-switches.
The CT100 is ideal for the most demanding
applications requiring accurate RIAA equalization, very low
noise, extremely low distortion and superior sonic
performance.
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 CT100
makes it equivalent to other signal sources like
CD-players.
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FEATURES
- Compact
design. Dual-mono. Very low noise
- Balanced
output option
- Non-inductive
low noise SMD metal film
resistors
- Input
accepts moving coil/moving magnet
(MC/MM) cartridges directly without
step-up
transformer
- Input
loading 10 Ohm to 47kOhm for MC/MM
selectable in 21 steps
- Input
nominal levels 0.1mV to 10mV
selectable in 34 steps
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High output drive. Balanced 28V. Unbal. 14V
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High
accuracy RIAA equalization with
0.05dB tolerance
- Additional
time constants of 3.18uS and/or
7950uS 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 on-
board for each channel. Separate DC
supply
input for each channel
(dual mono) | |
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OUTLINE DRAWING
AND
DIMENSIONS
(mm) | |
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Note |
Symbol,
parameter |
(conditions /
comments) |
Value |
Unit |
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1 |
VS, supply
voltage |
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+/-50 |
V |
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1 |
VIN, input
voltage |
(AV = 40dB to
80dB) |
+/-1 |
V |
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1 |
TS, storage
temperature range |
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-40 to +85 |
deg.
C | | |
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Note |
Symbol,
parameter |
(conditions /
comments) |
Value |
Unit |
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2 |
VS, supply
voltage range |
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+/-9 to +/-35 |
V |
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2 |
TA, ambient
temperature range |
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-25 to +70 |
deg.
C | | |
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DC ELECTRICAL
CHARACTERISTICS
(Typical values at
TA = +25 deg.C and RL = 1k unless
otherwise specified)
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Note |
Symbol,
parameter |
(conditions /
comments) |
Value |
Unit |
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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 |
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CIN,
input capacitance |
(DIP-switch
selectable) |
Approx.
100,200,300,400 |
pF |
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3 |
IB, input
bias current |
(Input bias current cancellation
pre-adjusted) |
Max. 0.5 |
uA |
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4 |
PSRR, power supply rejection
ratio |
(AV = 40dB, 10Hz to
20kHz) |
120 |
dB |
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RO, output
resistance |
(VO = 1V, DC to
100kHz) |
0.1 |
Ohm |
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VO, output
voltage swing |
(Unbalanced
operation) |
Min. 14.2 |
V |
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IO, output
current |
(RL = 100
Ohm) |
25 |
mA |
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IS, supply
current |
(Each channel) |
22 |
mA | | |
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AC ELECTRICAL
CHARACTERISTICS
(Typical values at
TA = +25 deg.C and RL = 1k unless
otherwise specified)
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Note |
Symbol,
parameter |
(conditions /
comments) |
Value |
Unit |
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VIN,
input nominal levels |
(VO = 1V) (DIP-switch
selectable)
(0.10mV ~ AV =
80dB)
(1.0mV ~ AV =
60dB)
(10mV ~ AV =
40dB) |
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 |
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VINO,
input overload level |
(f = 1kHz, AV =
40dB) |
100 |
mV |
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AV, voltage
gain |
(DIP-switch
selectable) |
40 to 80 |
dB |
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4,5 |
dAV, RIAA
equalization deviation |
(Ref.= 1kHz, 10Hz to
20kHz) |
0.05 |
dB |
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BW,
bandwidth |
(-3dB, VO = 1V,
AV = 40dB) |
2 |
MHz |
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4 |
en, input
noise voltage density |
(f0 = 1kHz,
AV = 80dB) |
0.5 |
nV/Hz |
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4,6 |
S/N, signal to noise
ratio |
(AV =
40/60/80dB) |
98/90/71 |
dB |
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4 |
CS, channel
separation |
(AV = 40dB, 10Hz to
20kHz) |
120 |
dB |
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4 |
THD, total harmonic
distortion |
(AV = 40dB,
f0 = 1kHz) |
0.0003 |
% | | |
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Notes
1
Exposure to maximum rating conditions for extended periods of
time may affect device reliability.
2
Operating ratings indicate conditions for which other device
parameters may not apply.
3 At power up and
power down the value may be maximum 5uA for less than one
second.
4 Measured with Panasonic Audio
Analyzer VP-7722P
5 RIAA time constants are
75uS, 318uS and 3180uS. Additional time constants of 3.18uS
and
7950uS are DIP-switch
selectable.
6 Input short-circuited.
Reference: 1V. Response: RMS. Weighting:
IHF-A | |
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TYPICAL
APPLICATIONS
- High
performance RIAA preamplifier
for MC and MM cartridges
- High
performance RIAA headphone
amplifier
- Upgrading
Hi-Fi equipment
- Reference
RIAA preamplifier
-
Test equipment RIAA
preamplifier. | |
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AVAILABLE CT100
ACCESSORIES
CT-pow1
+/-22VDC mains wall
adapter for CT100.
For
220-240VAC mains.
Two pcs
CT100-pow1
required to power
CT100
in dual mono
operation. | |
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If you think the upper side
of the CT100 PCB is already heavily packed with components
then you should see the Surface Mount components
on the backside. | |
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