HC1 High Current Headphone Amp


  • Full Kit
  • Documentation
  • Intermediate

The HC1 is an expandable, high-powered headphone amp designed specifically for critical studio monitoring.

The HC1's circuit employs parallel amp stages for greater power and lower distortion. This parallel-opamp concept has been known in theory for decades and was put to practical use in Douglas Self's "5532 OpAmplifier" power amplifier. As a result, the HC1 sounds clean and clear even at high gain and when driving low-impedance headphones.

Because everyone's monitoring needs are different, the HC1 is designed to be customized. The power and audio input connectors are screw terminals, so you can attach whichever jacks you need without soldering. You can also daisy chain multiple HC1s to make a multi-channel headphone amp.

The HC1 is a great project for intermediate builders who enjoy the challenge of choosing their own chassis and inputs.


  • High-current, dual-amp design
  • Screw terminals for power and audio input
  • Stereo, unbalanced audio input
  • Accepts 9v battery or DC wall-wart power input
  • Mounting holes for case mounting
  • Runs about 50 hours on a single 9V battery
  • Does not include power or audio input jacks

Partial Kit Includes

  • Printed Circuit Board (PCB)
  • 2x NE5532 opamps
  • All resistors and capacitors required
  • TRS 1/4" headphone jack
  • Volume potentiometer and knob
  • Screw terminals for power and audio input

Full Kit Also Includes (coming soon)

  • Aluminum chassis
  • External 12v DC power supply
  • TRS 1/4" input jacks




  • Input Impedance: 20kΩ
  • Current Draw: 10-20mA
  • Gain: 0-10dB (customizable)
  • Power Supply: 9 to 44VDC

Customer Reviews

Based on 12 reviews
Awesome Headphone Amp

I was looking for a really simple headphone amp for a project and this one just so happens to be one of the best DIY Kits I have came across. Very simple to build and the PCB is really good quality. I will definitely be getting more.

It is basically CMoy but with output buffer...

...and therefore it sounds great. The offset voltage could be set with a trimmer for more precise headroom though.

Supertuesday Productions

Great beginner project and solid sounding headphone amp!

Douglas Di Franco
Quick assembly - fantastic sound

Board assembles easily and quickly, very well made and marked. Only just powered it up for the first time, there's plenty of power into my HD580 with iPhone SE2 providing the test tunes. And from a 9v battery, I will test with some power supplies I have sitting around for just an occasion like this. Sound appears full, very pleased!

Edward Archibald
Extremely transparent, beautifully powerful!

I just put the kit together this evening and then did some experiments. My favorite revelation was when I hooked it up to the line-out of my UAD Apollo Twin in place of the built-in headphone jack. Wow! It really gives me another perspective on my music and I'm very grateful!

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