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    • Amplifiers
      • 600W MOSFET Amplifier
      • 400W Hifi Mono Amplifier
      • 200W Hifi Mono Amplifier
      • 100W MOSFET Amplifier
      • 100W BJT Mono Amplifier
      • TDA2030 Stereo Amplifier
      • TDA7294 Mono Amplifier
      • LM3886 Hifi Audio Amp
      • 150W Hifi QC Amplifier
      • 100_100w Stereo Amplifier
      • TDA7265 2.1 Car Amplifier
      • Speaker Protection Board
    • BT & SUB
      • Hi gain bass treble board
      • Subwoofer Low Pass Filter
      • 3 way active crossover
      • Hifi Pre Amp BT PCB Board
    • Power Supply
      • Compact Regulated supply
      • Multiuse Power Supply
      • 10A Power Supply Board
      • 35A Power Supply Board
      • 6v 12v Emergency Light
      • 12v Auto Day Night light
    • Components
      • Transistor Price list
      • Diode and BridgeRectifier
      • Capacitor Price List
      • Integrated Circuits price
      • Misc Components
Vasp Electronics

Contact us:- +91 9424930058 ( Whatsapp )

  • Home
  • Amplifiers
    • 600W MOSFET Amplifier
    • 400W Hifi Mono Amplifier
    • 200W Hifi Mono Amplifier
    • 100W MOSFET Amplifier
    • 100W BJT Mono Amplifier
    • TDA2030 Stereo Amplifier
    • TDA7294 Mono Amplifier
    • LM3886 Hifi Audio Amp
    • 150W Hifi QC Amplifier
    • 100_100w Stereo Amplifier
    • TDA7265 2.1 Car Amplifier
    • Speaker Protection Board
  • BT & SUB
    • Hi gain bass treble board
    • Subwoofer Low Pass Filter
    • 3 way active crossover
    • Hifi Pre Amp BT PCB Board
  • Power Supply
    • Compact Regulated supply
    • Multiuse Power Supply
    • 10A Power Supply Board
    • 35A Power Supply Board
    • 6v 12v Emergency Light
    • 12v Auto Day Night light
  • Components
    • Transistor Price list
    • Diode and BridgeRectifier
    • Capacitor Price List
    • Integrated Circuits price
    • Misc Components

150 watt QC AMPLIFIER USING NPN POWER TRANSISTORS

150 Watt Amplifier PCB

150 Watt 2SC5200 Amplifier Board

150 Watt 2SC5200 Amplifier Board

150w amplifier board

150 watt amplifier PCB only

  Price Rs 129.00 each

BUY NOW

150 Watt 2SC5200 Amplifier Board

150 Watt 2SC5200 Amplifier Board

150 Watt 2SC5200 Amplifier Board

150w hifi amplifier board

 Assembled & Tested Board 

Price Rs 699.00

BUY NOW

150 watt QC amplifier Board Photo Gallery

150w QC Amplifier PCB

    "cheetah" 150 Watt quasi complementary amplifier

    2N3055 2N3773 Hifi Amplifier Board

    Intro

    New version of our 150 watt Hifi Quasi Complementary ( Only NPN Power Transistors ) Amplifier. 


    More Robust Drivers and Improved PCB Design.


    Compatible Power Transistors - 2SC5200 / 2N3055 / 2N3773 / TIP35C / NJW0281G

    Features of 150 watt amplifier

    • High Output  -  150 watt Max  Dynamic output power .
    • Very Low Distortion - 0.01% Total Harmonic Distortion at 60 watt power output.
    • Speaker usability - 4 & 8 ohms, 50 watt to 200 watt speakers can be used with this amplifier.
    • Broad supply voltage -  ±18 volts to ±35 volts DC supply working range. 
    • Standard components - All components used are available online or at your local electronics store. 
    • No SMD components - Only through hole components used, making soldering and replacement hassle free.  
    • Cost effective - This amplifier can be made in a fraction of cost compared to similar amplifiers available in market. 

    Brief Description of 150 watt amplifier circuit :-

                                                                           Click Here  to download 150 watt amplifier circuit diagram 

    Input Stage  

    Input stage works as a  transconductance amplifier ( voltage in - current out ).


    This stage consist of Long Tailed Pair (LTP) made of Q1 & Q5, working in differential mode. constant current flows from Constant Current Source (CCS) made of Q2, collector current of LTP is balanced by Current Mirror (CM) made of Q3 & Q4.


    In simple words input signal is amplified by the input pair Q1 & Q5, current amplified input signal is sent to VA Stage for voltage amplification.


    Voltage Amplification Stage ( VAS )

    As the name suggests all the voltage GAIN of the amplifier is achieved in VA Stage.  

    VAS of this circuit is Darlington ( Beta Enhanced ) so low GAIN transistors can be used.


    Signal received from input stage is amplified via Darlington pair Q6 & Q9. Constant current flows from CCS made of Q7. 

    Biasing circuit is made of Q8, preset RV1 is to adjust output stage biasing voltage. 


    it is important to note that the biasing transistor Q8 must be mounted on the same heatsink along with Output transistors to ensure thermal tracking. 


    In simple words signal received from input stage is amplified by Q6 & Q9. voltage amplified signal is sent to output stage.


    Output Stage ( OPS )

    This circuit has Class B output stage, so each half of the signal is amplified by each  NPN output transistors.

    Driver Transistors Q10 & Q11 work as buffer to prevent excessive loading of VAS as well as to provide input to the output transistors Q12 and Q13 respectively.


    Output Topology is Quasi Complementary with Baxandall Diode, thus NPN transistors are used as power output devices.


    Thermal feedback via transistor Q8 and correct bias voltage adjustment via preset RV1 is necessary to prevent output transistors from destruction by thermal runaway. 


     Negative feedback via R11 to the base of Q5 ensures overall amplifier performance and stability. 

    Zobel Network -  made of R24 & C9 provides protection against high frequency oscillations.


    In simple words signal received from VAS is given to the output transistors via driver transistors. output transistors conduct high current to drive the speakers in accordance with signal.

    150 Watt QC amplifier - specifications

    2N3055 2N3773 Hifi Amplifier Board

    Amplifier Type & configuration

    • 3 Stage Class AB amplifier 
    • INPUT -  Long tailed pair with Constant current source and current mirror
    • VAS - Darlington VAS with biasing control preset, biasing transistor mount on main heatsink.
    • OPS - Quasi complementary NPN transistor power output Pair.

    Input and GAIN

    • Input Sensitivity - 500mV to 3V ( Peak to Peak)
    • GAIN - 26.8dB  ±0.1 dB 20 - 20 KHz
    • AC Stability -  720 KHz
    • Noise at Output - 135nV/Hz1/2

    Maximum Dynamic Output Power

      Power output at various Supply Voltages -  

    • 12v - 0 - 12v  = 20 Watt 
    • 18v - 0 - 18v  =  40 Watt 
    • 24v - 0 - 24v  =  80 Watt (Recommended)
    • 35v - 0 - 35v  =  150 Watt (High heat )


      Standard Test configuration for output power measurement - 

    • 2SC5200 transistors
    • 1Khz Sine wave input signal
    • 4Ω 800 Watt Load Resistors

    PCB Specification -

    • Type of PCB  - Single sided, Glass Epoxy FR-4 Grade A  
    • PCB Size - 99 mm x 70 mm (3.9 inch x 2.7 inch ), pcb Thickness - 1.6 mm.
    • Thickness of copper on PCB - 35 micrometer 


    PCB designed with thick copper tracks & large solder pads to facilitate straightforward  placement and soldering of components. 

    Compatible / Replacement Part no. with Datasheet download links.*

         Transistors  

    • Q1, Q2, Q5 - 2N5401, MPSA92, MPSA93


    • Q3, Q4, Q6 - 2N5551, MPSA42, MPSA43


    • Q7                   - BD140, MJE350, 2SA1220,


    • Q8, Q9          - BD139, MJE340, 2SC2690, 


    • Q10               - 2SC2073, 2SC4793, TIP41C, MJE15028-30-32


    • Q11               - 2SA940, 2SA1837, TIP42C, MJE15029-31-33


    • Q12, Q13       - 2SC5200, 2N3055, 2N3773, TTC5200, 2SC5200N, NJW0281G, TIP35C


                * - Always use complementary NPN-PNP pairs. 

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