Workhorse 1500W Bipolar Class H - diyAudio
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[top]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

[top]Additional Features

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


[top]Bill of Materials

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

[top]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.>

[top]Construction (Steps / Tips / Notes)

[top]Project Files

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

[top]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
  • [top]Known Substitutions

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

  • [top]Reviews

    No reviews yet...

    [top]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!!!

    [top]Related Group Buys

    • Thread 1234
    • GroupBuy:PSU

    Attached Images
    File Type: jpg WH1500H Schematic.jpg (477.5 KB, 1671 views)
    File Type: jpg WH1500H Schematic_thumb.jpg (110.8 KB, 2509 views)
    Attached Files
    File Type: zip WH1500H PCB (629.6 KB, 1224 views)
    File Type: zip WH1500H PCB (527.9 KB, 821 views)

    Contributors: dfidler, Workhorse
    Created by dfidler, 16th January 2011 at 03:44 PM
    Last edited by dfidler, 18th January 2011 at 08:06 AM
    Last comment by Workhorse on 19th November 2012 at 03:58 AM
    5 Comments, 13,165 Views
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