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HPA-1 Class A Headphone Amplifier

HPA-1 Class A Headphone Amplifier

January 9, 2020 · by Bonsai · in Useful Audio Links

This class A headphone amplifier from 2014 is based on the design I used in my ‘Symphony’ preamp. It will drive a pair of 32 Ohm headphones to 6V pk-pk and remain in class A with < 330 parts per…

kx-amplifier: A very high performance 28 Watt class A Current Feedback Amplifier

kx-amplifier: A very high performance 28 Watt class A Current Feedback Amplifier

March 16, 2018 · by Bonsai · in Amplifiers, Power Amplifiers

The Hifisonix kx-Amplifier is a 28 Watt class A DIY Current Feedback (CFA) power amplifier featuring low distortion, wide bandwidth and fast rise/fall times.  It can be operated either in pure class A mode, or in class AAB mode with…

JLH 10 Watt Class A Amplifier

February 13, 2016 · by Bonsai · in Power Amplifiers, Useful Audio Links

This is a copy of the original John Linsley-Hood article that appeared in Wireless World in 1969. This design, almost 50 years old, is still built in its hundreds all over the world.  A quick root around on the web…

Class A Buffering the Correct Way

February 2, 2016 · by Bonsai · in Audio Design Library, Useful Audio Links

Here’s a simple way to force an opamp output stage to run in class A when used with a discrete buffer output stage – it takes just 1 resistor to provide a near constant current source load. Operating the opamp…

Ovation nx-Amplifier

Ovation nx-Amplifier: A High Performance 100 W class AB Current Feedback Amplifier

July 15, 2014 · by Bonsai · in Power Amplifiers

This power amp design is based on the sx-Amplifier topology, but with the TIS and output stage re-configured for class AB operation, enabling it to deliver 100 W into 8 Ohms. I have kept the design very simple, retaining the…

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