Stereo Amplifier Module Class AB Bipolar Transistor 2x125W / 4 Ohm

Module Amplificateur Stéréo LM3886 2x68W / 4 Ohm
This Class A/B stereo power amplifier module is made of discrete components and can develop a power of 2x 125W under a 4Ω load and 2x75W under an 8Ω load. Specially designed for audiophile applications, it features high-quality components. The module accepts an unbalanced RCA signal (AUX) as well as a balanced XLR signal.

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2 Years warranty

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Stereo Amplifier Module

Class AB Bipolar Transistor 2x125W / 4 Ohm

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm

This Class A/B stereo power amplifier module is made of discrete components and can develop a power of 2x 125W under a 4Ω load and 2x75W under an 8Ω load. Specially designed for audiophile applications, it features high-quality components: two JRC5532D low-noise dual AOPs coupled to TL431 voltage regulators, two TI TL071CP dual OPAs, two pairs of Toshiba 2SA1943/2SC5200 power amplifiers and two pairs of A1930/C5171 transistors.

The first two OPA5532s do not have a traditional AOP function; they are there to receive the input signal. The TL0771CP OPAs act as preamplifiers, before the signal passes through the power amplification stage comprising two pairs of Toshiba 2SA1943/2SC5200 transistors. Two output inductors then process the signal to slow down surges and current peaks, to clean the signal of high-frequency noise and to correct the phase shift of the high-frequency crossover capacitors in advance.

The module's power supply accepts voltages from 15-0-15V to 30-0-30V AC.

Audio signal input is via screw terminals. Thanks to these two screw terminals, two configurations are possible. The module accepts an unbalanced RCA signal (AUX) as well as a balanced XLR signal. A switching relay and a button are used to select the source mode.

Relation between supply voltage and output power

The output power of this module is affected by the supply voltage. In fact, the higher the supply voltage, the higher the output power. If the module is supplied at 20V AC, output power can reach 2x 68W @ 4Ω and 2x40W @ 8Ω. With a 25V AC supply, output power reaches 2x 110W @ 4Ω and 2x 60W @ 8Ω. And finally if the module is supplied with 30V AC the maximum output power will be 2x 125W @ 4Ω and 2x 75W @ 8Ω.

The recommended quiescent current for this module is 50mA.
Capacitors are not supplied, but two 50V 4700uF or 63V 6800uF capacitors will work perfectly with this module.

Toshiba 2SA1943/2SC5200 amplifier module overview

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm
1Test points for temperature information
2Left channel output terminal block
3Right channel output terminal block
4AC-GND-AC power supply terminal block (15-30V AC) 
5LED operating indication 
6XLR mode LED indication
7RCA/XLR switch button
8Gain switch
9RCA/XLR1 signal input terminal
10XLR2 signal input terminal block
11Potentiometer connector

Gain and volume control with potentiometer

This amplifier module features a 2-position gain switch (see diagram 8). The first position corresponds to the follower setting, i.e. x1, and the second position to a gain setting of x2.

A 5-pin PH2.0 connector (see 11 on diagram) is used to connect a volume control potentiometer. For this function to be active, the R and L jumpers on the rear of the PCB must also be opened.

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm

Gain switch knob

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm

5-pin connector for potentiometer

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm

Jumpers R and L

LED indicators

A red two-color LED indicates that the module is switched on. Blue indicates that the module is operating. (The power-up delay is approximately 5 seconds; if the protection circuit detects a fault, the power amplifier circuit will not light up).

If the other yellow LED lights up, this simply indicates that XLR mode is on.

Module Amplificateur Stéréo Class AB à Transistors Bipolaires 2x68W / 4 Ohm

Technical characteristics

Specifications
Product typeAmplifier module
Amplification typeClass AB
Output power2x125W @ 4Ω (with power supply 30V AC)
2x75W @ 8Ω (with power supply 30V AC)

2x 110W @ 4 Ohm (with power supply 25V AC)
2x 60W @ 4 Ohm (with power supply 25V AC)

2x68W @ 4Ω (with power supply 20V AC)
2x40W @ 8Ω (with power supply 20V AC)
Output impedance4-8
InputsScrew terminals (RCA or XLR)
OutputsScrew terminals (RCA or XLR)
General
power supply voltage15 to 30V AC
Dimensions (LxPxH)170 x 134 x 61mm
Weight700g
Package1x Bipolar Transistor Class AB Stereo Amplifier Module
 
Data sheet
InputScrew terminals
OutputScrew terminals
Channel2 (Stereo)
ClassClass A / AB
Amplifier chip2SA1943 - 2SC5200
Power (W)125.0
 
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Average votes
5.0 / 5
1 reviews
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 5/5
Date :
Réglage des courants de repos
Bonjour à tous,
J'ai reçu un des premiers modules, très belle réalisation et de bonne qualité.
Pas encore mise en service, mais pour information, car ce n'est pas bien précisé dans la fiche technique, et suite à ma demande au service technique, les courants de repos à régler à 50mA se trouvent entre TP1 ET TP2 ET TP3 ET TP4 repérés sur le PCB 11mv relevé entre chaque point de test correspond à 50mA
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This review has been posted for Stereo Amplifier Module Class AB Bipolar Transistor 2x125W / 4 Ohm
 
Stereo Amplifier Module Class AB Bipolar Transistor 2x125W / 4 Ohm
This Class A/B stereo power amplifier module is made of discrete components and can develop a power of 2x 125W under a 4Ω load and 2x75W...

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