1pc LME49810 300W mono DC servo hi-fi amplifier board 2SA1930/2SC5171

Electrical characteristics:

Working status: Class A and B (can be adjusted to Class A as required)

Output power: 300 W * (8 Ω) <* V = ± 55 V>

Working voltage: recommended voltage drive stage ± 55V; current output stage ± 50V, current output stage voltage is always about 5V lower than the voltage of the drive stage voltage

Power supply mode: dual power supply operation mode, voltage drive and current output stage are operated separately or with combined power supply.

PCB size: 215 x 93.5 mm, PCB thickness 2 mm, PCB copper foil thickness 2OZ

Net weight: 300 g

Design features of the power amplifier board:

The DC servo design is adopted so that the center point of the power amplifier board is less than 5 MV.

The drive adopts the original 2SA1930 / 2SC5171 from Toshiba.

The current output stage adopts three pairs of Toshiba 2SA1943 / 2SC5200 power tubes with low output impedance and wide power margin.

The power tube pairing error is within 2%.

There is a perfect center voltage protection circuit, a horn delay protection circuit, and the main chip uses UPC1237, which is stable and reliable.

The power supply with voltage/current level is designed separately to avoid the influence of power supply fluctuation on the front stage under high dynamic and minimize the sound pollution.

Introduction to LME49810:

The LME49810 is equipped with a 300W mono power amplifier board NS. The latest LME49810 driver IC is the core and can be used with a variety of output stage power tubes. The LME49810 chip is a very original mono audio power amplifier driver for audiophiles. And professional audio system. The unique feature of the LME49810 chip is the built-in Baker clamping circuit, which can ensure that the amplifier output is not saturated under overdriving conditions, because after the "soft clipping" of the high-level audio signal, unwanted audio signals will appear. All false signals are suppressed. The soft clipping function is very useful, as the use of older solid-state amplifiers is particularly susceptible to audio interference due to heavy overdriving.

The LME49810 power amplifier board is a mono design. Two power amplifier boards are required to form a dual channel. Each channel uses one LME49810 + three pairs of tubes (bipolar transistors are compatible with MOSFET pins). The left and right channels have a symmetrical PCB structure. The PCB uses a 2 mm thick high-quality board.

Main parameters of the LME49810 chip:

Wide voltage range ± 20V to ± 100V

Conversion rate 50V / μs

Drive current 60mA (typ)

Suppression ratio of the power supply ripple (f = DC) 110 dB

Total harmonic distortion + noise (f = 1 kHz) 0.007

Package:

1pc LME49810 300W mono DC servo hi-fi 2SA1930 / 2SC5171 AMP amplifier board.