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Workhorse 1500W Bipolar Class H

The Project

Do it yourself, Class-H power amplifier 1500WRMS @ 2ohms


Its a Class-H amplifier with following features:

1: Fully complementary symmetry input differential with Cascode loading.

2: CE-CB Cascode VAS for wider bandwidth.

3: 2 Step rail switching with controlled slew for minimizing switching noise.

4: Triple EF output stage for high damping factor and ease in 2 ohms load driving.

5: All set of required basic professional protection circuitry.

6: Almost Half the heat dissipation of same wattage class-ab amplifier due to Rail Tier Switching and excellent handling of reactive loads.


Goal: To design a reliable amplifier with professional standards.

Result: All design goals met.


Voltage Gain26dB
Full power Bandwidth20-20kHz
Power output1500WRMS @ 2ohms
Input Sensitivity4Vrms @ 8Ohms
S/N Ratio100dB
Peak Consumption4400VA @dual channel @ 2ohms continuous music operation
Idle Consumption110W
Harmonic Distortion0.05% THD [FPRL]
Load Impedance2 ohms minimum
Slew Rate33v/uS
StabilityUnconditionally stable with all known real world speaker loads
Output configurationsParallel/Stereo/Bridge operation
Damping Factor>1000 @ 100hz

Additional Features

  • Thermal shutdown
  • DC Fault
  • Muting
  • Short Circuit Protection
  • True Clip Detection
  • Signal out
  • Fault Status


Bill of Materials

There is no BOM just yet. Will be added later.

Simulations and Analysis

<Embed the images for your simulations here along with descriptions for each of them so people know what you're talking about.>

Construction (Steps / Tips / Notes)

Project Files

The files for this project are available in the attachments section at the bottom of the page.

Other Notes

  • Requires 2800VA transformer with following winding specs: 85-50-15-0-15-50-85 14A secondary.
  • PCBs should be printed with minimum 35micron and PTH is must as there are vias on the board
  • PCB measures 37 X 12 cm (4.75 x 14.5 in)
  • Bias Pots: 10mV across emitter resistors of output devices corresponds to 30mA through each device, should be optimum

Known Substitutions

  • You can use Genuine 5200/1943 upto 1.5KW or MJL21196/95 for 2KW


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Build Threads


Have you built this project? If so, please add the URL to the thread that you started to show off your build.
  • URL to my uber build 1 thread
  • URL to my super dooper build 2 thread!!!

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