My new Preamplifier
Introduction
HPA-1 uses Dual FET input, Dual transistor and Class A transistor. It has one balance and one unbalance input. The 4 layers circuit board is sandwiched between two copper templates. External power supply is convenient to choose any kinds of power supply.
Material
Circuit board 4 Layers plating
Transistor
Linear Systems LS843 (Dual FET)
Toshiba 2SA1349 (Dual transistor)
Toshiba 2SC3381 (Dual transistor)
Toshiba 2SA970
Toshiba 2SC2240
Toshiba 2SA1930
Toshiba 2SC5171
Resistance
Vishay UXB 0207 0.1% 10ppm (Instrumentation)
Vishay MMB 0207 0.1% 25ppm (Instrumentation)
Vishay RN55D 1% 100ppm
Precision Rssistive GP1/4 0.1% 50ppm
Capacitor
Philips 116 Aluminium electrolytic
Nippon Chemi-Con Aluminium electrolytic
Sanyo Aluminium electrolytic
Wima MKP2
Evox Rifa MMK
AVX Kyocera Ceramic
Johanson Dielectrics Ceramic
Integrated circuit
Texas Instruments LM317
Texas Instruments LM337
Texas Instruments NE5534P
Analog Devices AD847AQ (Ceramic PGA)
Potentiometer
Alps RK097
Selector
Alps
On/Off
Matsushita
Wiring
Quirkwire M16878 silver plated (Signal wiring)
Connector
Neutrik NC3FD-LX-HE (Top XLR connector)
Fischer connector S103 / Neutrik RCA
Neutrik NRJ6HM-1-AU (Top 1/4’’stereo jack)
Neutrik NAC3MPA (Power socket)
(Above components are subjects to change without prior notice)
Specifications
Level
10Hz → 100kHz ±0.5dbm (0dbm@XLR)
20Hz → 50kHz ±0.1dbm (0dbm@XLR)
THD+N
10Hz → 40kHz ±0.05% (0dbm@XLR)
Phase
1kHz < 0.03℃ 100kHz < 9℃(0dbm@XLR)
Gain
6.2dbm (0dbm@XLR)
Noise
10Hz -110dbm 1K -130dbm 10K -135dbm
(Neutrik A2D-Audio Measurement System)
Headphone
16Ω → 600Ω
Power Supply
DC ± 20V
(Internal regulator circuit, suitable for DC ± 20V→ 24V)
Introduction
HPA-1 uses Dual FET input, Dual transistor and Class A transistor. It has one balance and one unbalance input. The 4 layers circuit board is sandwiched between two copper templates. External power supply is convenient to choose any kinds of power supply.
Material
Circuit board 4 Layers plating
Transistor
Linear Systems LS843 (Dual FET)
Toshiba 2SA1349 (Dual transistor)
Toshiba 2SC3381 (Dual transistor)
Toshiba 2SA970
Toshiba 2SC2240
Toshiba 2SA1930
Toshiba 2SC5171
Resistance
Vishay UXB 0207 0.1% 10ppm (Instrumentation)
Vishay MMB 0207 0.1% 25ppm (Instrumentation)
Vishay RN55D 1% 100ppm
Precision Rssistive GP1/4 0.1% 50ppm
Capacitor
Philips 116 Aluminium electrolytic
Nippon Chemi-Con Aluminium electrolytic
Sanyo Aluminium electrolytic
Wima MKP2
Evox Rifa MMK
AVX Kyocera Ceramic
Johanson Dielectrics Ceramic
Integrated circuit
Texas Instruments LM317
Texas Instruments LM337
Texas Instruments NE5534P
Analog Devices AD847AQ (Ceramic PGA)
Potentiometer
Alps RK097
Selector
Alps
On/Off
Matsushita
Wiring
Quirkwire M16878 silver plated (Signal wiring)
Connector
Neutrik NC3FD-LX-HE (Top XLR connector)
Fischer connector S103 / Neutrik RCA
Neutrik NRJ6HM-1-AU (Top 1/4’’stereo jack)
Neutrik NAC3MPA (Power socket)
(Above components are subjects to change without prior notice)
Specifications
Level
10Hz → 100kHz ±0.5dbm (0dbm@XLR)
20Hz → 50kHz ±0.1dbm (0dbm@XLR)
THD+N
10Hz → 40kHz ±0.05% (0dbm@XLR)
Phase
1kHz < 0.03℃ 100kHz < 9℃(0dbm@XLR)
Gain
6.2dbm (0dbm@XLR)
Noise
10Hz -110dbm 1K -130dbm 10K -135dbm
(Neutrik A2D-Audio Measurement System)
Headphone
16Ω → 600Ω
Power Supply
DC ± 20V
(Internal regulator circuit, suitable for DC ± 20V→ 24V)
Attachments
Hi kawo,
Nice realization. I don't see any output on the picture except headphone on front panel! Is it only a headphone amplifier.My new Preamplifier
...It has one balance and one unbalance input...
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