Saturday, February 03, 2018

Mini Amplifier with High Power Output

Hello dear friends, I share a post about mini power amplifier circuit, Yea this is mini and simple power amplifier using the transistor and a final transistor using 2SC5200 and 2SA1943. but you make no mistake, despite the simple power amplifier designed for output power should not be underestimated. Mini power amplifiers are capable of powering up to 300W high power output amplifier if properly coupled using good components and a qualified power supply.

Below the circuit diagram of Mini Power Amplifier 300W:
Mini Strong power amplifier circuit diagram
Component list:
R1               = 56K
R2, R5        = 100R
R3               = 20K
R4               = 1K
R6, R10      = 22K
R7               = 2K7
R8               = 100K
R9               = 2K2
R11, R12     = 0,1R / 3W
C1               = 1uF nonPolar
C2               = 100pF
C3               = 120pF
C4               = 220uF/50V
C5               = 47uF/100V
Q1, Q2        = BC556
Q3,Q4         = BC546
Q5               = BD139
Q6               = BD140
Q7               = 2SC5200
Q8               = 2SA1943
FU1,FU2     = 2.5Ampere
D1, D2        = 1N4148
D3, D4, D5 = 1N4007
J1                = Audio Input
J2                = Speaker Output
J3                = +42VDC
J4                = -42VDC
J5                = GND

PCB Layout Design Mini Power Amplifier 
PCB Layout Design Mini Strong Amplifier

Mini strong power amplifier PCB Layout design
PCB Size 6cm x 7cm


  1. thanks for great job , now do those transistors 2sa and 2sc need heat sink or not required

    1. yes is required a heatsink for final transistor 2sc5200 and 2sa1943

  2. Q4 is wrong type.
    Q1, Q2 and Q3 are incorrectly polarized.
    There are many errors in this schematic.
    This amplifier wont work.

    1. this power amplifier is tedted, what the wrong? please give me a reason

    2. Nenad is right Wahyu, Q4 is reversed bias not sure it will conduct. Q1 and Q2 should be reversed, meaning emitters should be pulling from positive rails.

    3. Oh im sorry its updated your rights

    4. so that circuit diagram already aupgrase or not yet

  3. Sir I love this post. Is the circuit really 300w?

  4. How many ampere for power supply?

  5. Can I change the bd139 bd140 transistor???

  6. 2sc5200 15 amp 250 volts . In your circuit 10 amp at 80v equals 80w not 300

  7. This comment has been removed by the author.

  8. Sir is the circuit been updated? I am a newbie.. assembling this one..!
    Hope you reply soon.

  9. Wrong schematic. it's not working

  10. Wrong schematic. it's not working

  11. O par diferencial está errado, ocorreram equívocos neste amplificador. se funcionar, no máximo 80w


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