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(mis) Adventures in Hi-Fi

Tag: Headphone amplifier

Measuring the Slowdiyer Composite Headphone Amplifier

Posted on 5 November 20215 November 2021

For this next set of measurements I’ll be looking at another amplifier designed by Uffe at Slowdiyer. There’s no particular reason that I chose another of these designs straight after looking at his recent offering beyond the fact that it’s conveniently available on the rack next to my computer. In addition, it gives me a…

Measuring the SlowMoy OPA1656

Posted on 24 October 202111 November 2021

Following on from my last post, looking at integrating my existing equipment presented a small headache. I already have a headphones dummy load which, whilst not providing the exact impedance of my current headphones, does the job. The problem is that the outputs from the dummy load are BNC sockets, as it was originally designed…

A modern take on the CMoy Headphone Amplifier

Posted on 27 September 20215 December 2022

Anybody who has browsed these pages in the past knows that I keep an eye on certain people’s projects, one of those being Uffe at Slowdiyer. Recently he has been experimenting with USB-C power supplies, one of the offshoots from this being an updated version of the’mini-pre‘, a variant of the classic Chu Moy headphone…

Elliott Sound Projects P113 Headphone Amplifier

Posted on 22 October 202022 October 2020

I’m a fan of the projects on Rod Elliott’s ESP site as they come with lots of information to help you understand the circuit, and most are simple and robust enough for entry-level DIY hobbyists. Yet this does not mean these are low audio quality circuits, Rod specifies this P113 headphone amplifier as a very…

Another buffered opamp headphone amplifier

Posted on 8 June 20208 June 2020

For no particular reason I built another headphone amp. This one is similar to the Emmeline XP-7 clone I built, in that it utilises op-amps with buffers. The complete setup comprises three components; the amplifier itself, a dual power supply, and a delay circuit, all of which are slowdiyer designs. The amplifier is relatively straightforward…

Headphone amplifier power outputs

Posted on 24 May 202016 November 2021

Following on from my last post where I showed the headphones dummy load, I thought I would post the measurements I obtained from the other headphone amplifiers I have built. It’s also an excuse to play around with my new toys. I knew that eventually I would end up with an oscilloscope, I spent a…

Headphones Dummy Load

Posted on 17 May 202017 May 2020

A dummy load simulates your headphones by presenting the amplifier with an impedance as close to that of your headphones as possible, using high wattage resistors. There are a number of reasons you may wish to use this – but primarily you are able to protect your headphones and your hearing. You can use higher…

RJM Audio Sapphire 4 Headphone Amplifier

Posted on 12 May 202012 May 2020

I came across this headphone amplifier project about a year ago on DIYaudio.com. Built using the default choices, the class A output buffer provides 30 mW minimum output power into all headphone loads between 30 and 600 ohms. One of the things that impressed me was the continual input the designer Richard Murdey had on…

A resolved problem with Audioquest Dragonfly

Posted on 19 October 201920 October 2019

After I wrote and published a post regarding my experience with Superfi and Audioquest, I sent an email to Audioquest Managing Director Richard Brans expressing my frustration at my perceived lack of warranty support. I felt like the buck had been passed to Superfi, who were non-responsive, and I was being ignored. In all honesty…

Ray Samuels Audio XP-7 Headphone Amplifier clone

Posted on 4 May 20194 April 2020

I bought a mixed bag of boards recently and came across this one knowing nothing about it, apart from it appearing to be a headphone amp. I finally found out that it is a clone of a commercial project – the Emmeline XP-7 which has been around for a number of years. A cursory search…

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