Potência amplificador bordo lme49810, 100w 8r (sem lme49810 ic)

Kind tips:

No circuit diagram is provided for the products. Please do not buy it if you mind it. Thank you!

● One board is one channel, please buy two if you need two channels.
● The DIY kit needs to be welded by yourself, and the finished board has been welded and tested.
● All kits or finished boards do not include LME49810 IC, you need to purchase LME49810 IC separately.

LME 49810 is the latest flagship power amplifier chip from National Semiconductor in the United States.

Since the ordinary IC power amplifier is a single integrated circuit chip, that is to say, the input stage, amplifying stage, and output stage of the audio amplifier are all on the same chip. The power output stage will generate a relatively large amount of heat, and this heat will be fed back to the small signal input stage in the same chip and the signal amplifier stage. This distortion mechanism is called thermal distortion. This is also detailed and tested in SELF's book.

Therefore, in order to solve this problem, NS National Semiconductor introduced LME 49810 and LM49830 series power amplifier ICs in its later products.

49810 is a design that separates the small signal amplifier stage from the current output stage, which greatly improves the performance of the power amplifier, and greatly improves the power, output voltage range, dynamic range, and maximum output current and power of the integrated IC power amplifier. It is a multiplied growth of several loads.

THD distortion has been reduced by several tens of times, which can basically be compared with a well-designed high-end discrete power amplifier. It even surpasses many mid-range discrete power amplifier designs.

LJM himself designed this power amplifier around 2006 when the LME49810 first appeared on the market. Since the price of this IC has always been relatively high, relatively speaking, it does not have much advantage over the discrete power amplifiers of the L series, so it has not been launched. Now the IC price has reached an acceptable position. So now it’s on the shelf.

For those who like IC power amplifiers or beginners, this is a very good choice, or for those who have LM4766, or have installed LM3886 or 4780 power amplifiers, this is an upgradeable option.



The high-power tube uses the Japanese original Toshiba TTA1943 TTC5200 pair of tubes.

Parameter introduction: This is based on the official parameters of NS. For the specific actual AP test, you can see the following introduction: It is the actual test by LJM himself.

100% is the actual performance of the finished board.

PCB size: 92×76mm

Key Specifications

■ Wide operating voltage range ±20V to ±100V

■ Slew Rate 50V/μs (typ)

■ Output Drive Current 60mA (typ)

■ PSRR (f = DC) 110dB (typ)

■ THD+N (f = 1kHz) 0.0007 (typ)


IC LME 49810 chip main specifications
(Chip specifications and performance indicators are not equal to power amplifier circuit board performance indicators, power amplifier performance indicators are related to the designer's design, and are affected by different wiring and capacitance)

■Wide working voltage range ±20 v±100 v
■Conversion speed 50 v/μs(typ)
■Output drive current 60MA(typ)
■PSRR (f = DC) 110 decibels (typ)
■THD + N(f = 1 khz) 0.0007(typ)

Parameters of this kit/finished board:
●Supply voltage: DC +-15V to DC +-55V
●Output RMS power: 10- 150W 8 ohm 1K HZ
●THD+N =0.002% 20HZ-20 K HZ 40W RMS
●The output power tube is imported from Toshiba TTA1943 TTC5200
●The drive tube is imported from Toshiba 2SA1930 2SC5171

This kit will not use low-end low-frequency power tubes such as TIP142.
This kind of power tube completely wastes the LME49810 indicator.