ACP+ Parts Kit including JFETs
This kit includes all the parts you need to complete an ACP+. It was made available to assist those that initially purchased the PCBs only, but later decided they would like the full kit.
Key Information
- Pre and Headphone Amplifier Project
- Designed by Nelson Pass
- Beginner to Intermediate Difficulty
- Complete Kit Available
- Comprehensive Build Guide
Highlights
- Can be built in a day with basic tools
- Excellent beginner's project
- Can be tweaked to suit various headphone impedances as needed.
Links, Discussion & Files
The is the ACP+ is a wonderful project for beginner's. It an excellent first DIY preamplifier and headphone amplifier. People love it when paired with any of the the Amp Camp amplifiers to make a complete first-build system. It doesn't even require a chassis. Everything you need can be purchased in one kit and assembled in an afternoon. The performance and sound are exceptional, as you'd expect from a Nelson Pass design.
Photos of Poet's DIY ACP+

The photo on the right (taken by Thuss + Farrell) is an ACP+ with all parts chosen, stuffed, and soldered by Patrick Farrell's 10-year-old daughter, Poet. It demonstrates the beauty of a completely do-it-yourself ACP+ with a colorful parts selection.
Note - As mentioned, not all the parts shown in the photo are sold by the diyAudio Store. Please review each product to see what's included in your kit.
Sweet sound to embrace yourself within. Easy to build with excellent sound. Dressed with bricks for a neon personalized style. Love it!
The ACP+ goes together quickly and has to be the most bang for your buck in audio. While this would be a great first build it in no way is a "toy" project. It's right at home in between my Pearl 3 and Aleph JZM playing beautifully. Hats off to NP and the DIYaudio store crew for making these projects available. You folks are doing the good work of spreading the diy hifi gospel and it is greatly appreciated. Cheers!
This was my second build (my first was an Amp Camp Amp). It went together in an afternoon of soldering with no errors. The build guide was exceptional, but I reckon you could do it just as easily by reading the schematic and BOM if you've done any projects like this before. It's that easy.
Regarding the sound: it sounds swell! Compared to my other headphones amplifier (a Schiit Asgard 3), the soundstage is deeper and more dynamic. I'm noticing new details and texture in well produced music I know and love. Even when listening to poorly recorded tracks, I find them more engaging than before - it's hard to explain, but going back and forth between the two amps, the effect is undeniable. I didn't expect this big of a jump from an entry level project.
Given the price and time commitment, there's no reason not to give this project a shot. Worst case scenario, you end up with a cool looking conversation piece which sounds really good. Best case: you're now addicted to DIY audio and have a new hobby.
I’ve built plenty of projects at all levels of difficulty - this was definitely the easiest. I highly recommend it for a first time builder.
At the moment I have been using it as a headphone amp to drive some massdrop Sennheiser 58X headphones.
I will probably build a battery power supply for it sometime down the track but right now, I am enjoying it exactly in its stock configuration.
I have built four kits from the diyaudiostore, I trust the quality of the instructions and video to help me assemble a successful kit. I am very disciplined and imspect each component and measure the individual parts where possible. The simplicity of Pass designs is a major impact on the circuit performance. Thanks again to Papa